Red Hat eCos software User Guide

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eCos User Guide

eCos User Guide

Documentation licensing terms

This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/).

Distribution of the work or derivative of the work in any standard (paper) book form is prohibited unless prior permission is obtained from the copyright holder.

Trademarks

Altera® and Excalibur™ are trademarks of Altera Corporation.

AMD® is a registered trademark of Advanced Micro Devices, Inc.

ARM®, StrongARM®, Thumb®, ARM7™, ARM9™ is a registered trademark of Advanced RISC Machines, Ltd.

Cirrus Logic® and Maverick™ are registered trademarks of Cirrus Logic, Inc.

Cogent™ is a trademark of Cogent Computer Systems, Inc.

Compaq® is a registered trademark of the Compaq Computer Corporation.

Fujitsu® is a registered trademark of Fujitsu Limited.

IBM®, and PowerPC™ are trademarks of International Business Machines Corporation.

IDT® is a registered trademark of Integrated Device Technology Inc.

Intel®, i386™, Pentium®, StrataFlash® and XScale™ are trademarks of Intel Corporation.

Intrinsyc® and Cerf™ are trademarks of Intrinsyc Software, Inc.

Linux® is a registered trademark of Linus Torvalds.

Matsushita™ and Panasonic® are trademarks of the Matsushita Electric Industrial Corporation.

Microsoft®, Windows®, Windows NT® and Windows XP® are registered trademarks of Microsoft Corporation, Inc.

MIPS®, MIPS32™ MIPS64™, 4K™, 5K™ Atlas™ and Malta™ are trademarks of MIPS Technologies, Inc.

Motorola®, ColdFire® is a trademark of Motorola, Inc.

NEC® V800™, V850™, V850/SA1™, V850/SB1™, VR4300™, and VRC4375™ are trademarks of NEC Corporation.

PMC-Sierra® RM7000™ and Ocelot™ are trademarks of PMC-Sierra Incorporated.

Red Hat, eCos™, RedBoot™, GNUPro®, and Insight™ are trademarks of Red Hat, Inc.

Samsung® and CalmRISC™ are trademarks or registered trademarks of Samsung, Inc.

Sharp® is a registered trademark of Sharp Electronics Corp.

SPARC® is a registered trademark of SPARC International, Inc., and is used under license by Sun Microsystems, Inc.

Sun Microsystems® and Solaris® are registered trademarks of Sun Microsystems, Inc.

SuperH™ and Renesas™ are trademarks owned by Renesas Technology Corp.

Texas Instruments®, OMAP™ and Innovator™ are trademarks of Texas Instruments Incorporated.

Toshiba® is a registered trademark of the Toshiba Corporation.

UNIX® is a registered trademark of The Open Group.

All other brand and product names, trademarks, and copyrights are the property of their respective owners.

I. Introduction

....................................................................................................................................................

1. Key Features

..........................................................................................................................................

2. eCos Overview

......................................................................................................................................

3. eCos Licence Overview

........................................................................................................................

Questions and answers

....................................................................................................................

Previous License

..............................................................................................................................

4. Notation and Conventions

.....................................................................................................................

GDB and GCC Command Notation

................................................................................................

Directory and File System Conventions

..........................................................................................

Version Conventions

........................................................................................................................

5. Documentation Roadmap

......................................................................................................................

II. Installing eCos

..............................................................................................................................................

6. System Requirements

..........................................................................................................................

7. Installation on Linux

...........................................................................................................................

8. Installation on Windows

......................................................................................................................

9. Target Setup .........................................................................................................................................

Connecting Via Serial Line

...........................................................................................................

Connecting Via Ethernet

................................................................................................................

Using A Simulator Target

..............................................................................................................

Using A Synthetic Target

..............................................................................................................

III. Programming With eCos

.........................................................................................................................

10. Programming With eCos

...................................................................................................................

The Development Process

.............................................................................................................

16 eCos Configuration

..............................................................................................................

Integrity check of the eCos configuration

............................................................................

Application Development - Target Neutral Part

..................................................................

Application Development - Target Specific Part ..................................................................

11. Configuring and Building eCos from Source

....................................................................................

18 eCos Start-up Configurations

........................................................................................................

Configuration Tool on Windows and Linux Quick Start

...............................................................

Ecosconfig on Windows and Linux Quick Start

............................................................................

Selecting a Target

.................................................................................................................

12. Running an eCos Test Case

...............................................................................................................

Using the Configuration Tool

........................................................................................................

Using the command line

................................................................................................................

Testing Filters

................................................................................................................................

13. Building and Running Sample Applications

.....................................................................................

30 eCos Hello World

..........................................................................................................................

30 eCos hello world program listing

.........................................................................................

A Sample Program with Two Threads

..........................................................................................

31 eCos two-threaded program listing

......................................................................................

14. More Features — Clocks and Alarm Handlers

.................................................................................

A Sample Program with Alarms ....................................................................................................

IV. The eCos Configuration Tool ...................................................................................................................

15. Getting Started

..................................................................................................................................

Introduction

...................................................................................................................................

Invoking the eCos Configuration Tool

...........................................................................................

On Linux

..............................................................................................................................

On Windows

.........................................................................................................................

The Component Repository

...........................................................................................................

eCos Configuration Tool Documents

............................................................................................

Configuration Save File

.......................................................................................................

Save the currently active document

............................................................................

Open an existing document

........................................................................................

Open a document you have used recently

..................................................................

Create a new blank document based on the Component Registry

.............................

Save to a different file name

.......................................................................................

Build and Install Trees

.........................................................................................................

16. Getting Help

......................................................................................................................................

Context-sensitive Help for Dialogs

...............................................................................................

Context-sensitive Help for Other Windows

...................................................................................

Context-sensitive Help for Configuration Items

............................................................................

Methods of Displaying HTML Help

.............................................................................................

17. Customization

...................................................................................................................................

Window Placement

........................................................................................................................

Settings

..........................................................................................................................................

Settings: Display tab

............................................................................................................

Labels

.........................................................................................................................

Integer Items

...............................................................................................................

Font

.............................................................................................................................

Miscellaneous

.............................................................................................................

Settings: Viewers tab

............................................................................................................

View header files

........................................................................................................

View documentation

...................................................................................................

18. Screen Layout

...................................................................................................................................

Configuration Window

..................................................................................................................

Disabled items

......................................................................................................................

Right-Clicking

............................................................................................................

Conflicts Window

.................................................................................................................

Output Window

..........................................................................................................

Properties Window

.....................................................................................................

Short Description Window

.........................................................................................

19. Updating the Configuration

...............................................................................................................

Adding and Removing Packages

...................................................................................................

Platform Selection

.........................................................................................................................

Using Templates

............................................................................................................................

Resolving conflicts

...............................................................................................................

Automatic resolution

............................................................................................................

20. Searching

...........................................................................................................................................

21. Building

.............................................................................................................................................

Selecting Build Tools

.....................................................................................................................

Selecting User Tools

......................................................................................................................

22. Execution

...........................................................................................................................................

Properties

.......................................................................................................................................

Download Timeout ...............................................................................................................

Run time Timeout

................................................................................................................

Connection

...........................................................................................................................

Executables Tab

...................................................................................................................

Output Tab

...........................................................................................................................

Summary Tab

.......................................................................................................................

23. Creating a Shell

.................................................................................................................................

Keyboard Accelerators

..................................................................................................................

V. eCos Programming Concepts and Techniques

........................................................................................

24. CDL Concepts

...................................................................................................................................

About this chapter ..........................................................................................................................

Background

..........................................................................................................................

Configurations

......................................................................................................................

Component Repository

..................................................................................................................

Component Definition Language

..................................................................................................

Packages

........................................................................................................................................

Configuration Items

.......................................................................................................................

Expressions

..........................................................................................................................

Properties

.............................................................................................................................

Inactive Items

.......................................................................................................................

Conflicts

.........................................................................................................................................

Templates

.......................................................................................................................................

25. The Component Repository and Working Directories

......................................................................

Component Repository

..................................................................................................................

Purpose

.................................................................................................................................

How is it modified?

..............................................................................................................

When is it edited manually?

.................................................................................................

User Applications

.................................................................................................................

Examples of files in this hierarchy:

......................................................................................

Build Tree

......................................................................................................................................

Purpose

.................................................................................................................................

How is it modified?

..............................................................................................................

User applications

..................................................................................................................

Examples of files in this hierarchy

.......................................................................................

Install Tree

.....................................................................................................................................

Purpose

.................................................................................................................................

How is it modified?

..............................................................................................................

When is it edited manually?

.................................................................................................

User applications

..................................................................................................................

Examples of files in this hierarchy

.......................................................................................

Application Build Tree

..................................................................................................................

26. Compiler and Linker Options

............................................................................................................

Compiling a C Application

............................................................................................................

Compiling a C++ Application

.......................................................................................................

27. Debugging Techniques

......................................................................................................................

Tracing

...........................................................................................................................................

Kernel Instrumentation

..................................................................................................................

VI. Configuration and the Package Repository

...........................................................................................

28. Manual Configuration

.......................................................................................................................

Directory Tree Structure

................................................................................................................

Creating the Build Tree

.................................................................................................................

ecosconfig qualifiers

.............................................................................................................

ecosconfig commands

..........................................................................................................

Conflicts and constraints

................................................................................................................

Building the System

......................................................................................................................

Packages

........................................................................................................................................

Coarse-grained Configuration

.......................................................................................................

iii

Fine-grained Configuration

...........................................................................................................

Editing an eCos Savefile

................................................................................................................

Header

..................................................................................................................................

Toplevel Section

...................................................................................................................

Conflicts Section

..................................................................................................................

Data Section

.........................................................................................................................

Tcl Syntax

..........................................................................................................................

100

Editing the Sources

......................................................................................................................

104

Modifying the Memory Layout

...................................................................................................

105

29. Managing the Package Repository

..................................................................................................

107

Package Installation

.....................................................................................................................

107

Using the Administration Tool

...........................................................................................

107

Using the command line

....................................................................................................

108

Package Structure

........................................................................................................................

108

VII. Appendixes

............................................................................................................................................

111

A. Target Setup

......................................................................................................................................

112

MN10300 stdeval1 Hardware Setup

............................................................................................

112

MN10300 Architectural Simulator Setup

....................................................................................

112

AM33 STB Hardware Setup

.......................................................................................................

113

Use with GDB Stub ROM

.................................................................................................

113

Use with the JTAG debugger

.............................................................................................

113

Building the GDB stub ROM image

..................................................................................

114

TX39 Hardware Setup

.................................................................................................................

114

TX39 Architectural Simulator Setup

...........................................................................................

115

TX49 Hardware Setup

.................................................................................................................

115

Preparing the GDB stubs

...................................................................................................

115

Building the GDB stub image with the eCos Configuration Tool

............................

116

Building the GDB stub image with ecosconfig

........................................................

116

Installing GDB stubs into FLASH

.....................................................................................

116

VR4300 Hardware Setup

.............................................................................................................

117

VRC4375 Hardware Setup

..........................................................................................................

117

Atlas/Malta Hardware Setup

.......................................................................................................

117

PowerPC Cogent Hardware Setup

...............................................................................................

117

Installing the Stubs into ROM

...........................................................................................

118

Preparing the Binaries

..............................................................................................

118

Building the ROM images with the eCos Configuration Tool

........................

118

Building the ROM images with ecosconfig

....................................................

118

Installing the Stubs into ROM or FLASH

................................................................

119

PowerPC MBX860 Hardware Setup

...........................................................................................

119

Installing the Stubs into FLASH

........................................................................................

119

Preparing the Binaries

..............................................................................................

119

Building the ROM images with the eCos Configuration Tool

........................

119

Building the ROM images with ecosconfig

....................................................

120

Installing the Stubs into ROM

..................................................................................

120

Installing the Stubs into FLASH

..............................................................................

120

Program FLASH

.............................................................................................

120

PowerPC Architectural Simulator Setup

.....................................................................................

121

SPARClite Hardware Setup

.........................................................................................................

121

Ethernet Setup

....................................................................................................................

121

BOOTP/DHCP service on Linux

.............................................................................

122

BOOTP/DHCP boot process

....................................................................................

122

Serial Setup

........................................................................................................................

123

SPARClite Architectural Simulator Setup

...................................................................................

123

ARM PID Hardware Setup

..........................................................................................................

123

Installing the Stubs into FLASH

........................................................................................

124

Preparing the Binaries

..............................................................................................

124

Building the ROM images with the eCos Configuration Tool

.................................

124

Building the ROM images with ecosconfig

..............................................................

124

Building the FLASH Tool with the eCos Configuration Tool

..................................

124

Building the FLASH Tool with ecosconfig

..............................................................

125

Prepare the Board for FLASH Programming

...........................................................

125

Program the FLASH

.................................................................................................

125

Programming the FLASH for big-endian mode

.......................................................

127

Installing the Stubs into ROM

...........................................................................................

128

ARM AEB-1 Hardware Setup

.....................................................................................................

128

Overview

............................................................................................................................

128

Talking to the Board

...........................................................................................................

128

Downloading the Stubs via the Rom Menu

.......................................................................

129

Activating the GDB Stubs ..................................................................................................

129

Building the GDB Stub FLASH ROM Images

..................................................................

130

Building the GDB Stubs with the eCos Configuration Tool

..............................................

130

Building the GDB Stub ROMs with ecosconfig

................................................................

130

ARM Cogent CMA230 Hardware Setup

....................................................................................

131

Building the GDB Stub FLASH ROM images

..................................................................

131

Building the GDB Stubs with the eCos Configuration Tool

..............................................

131

Building the GDB Stub ROMs with ecosconfig

................................................................

131

Cirrus Logic ARM EP7211 Development Board Hardware Setup

.............................................

132

Building programs for programming into FLASH

............................................................

132

Building the GDB Stub FLASH ROM images

..................................................................

133

Building the ROM images with the eCos Configuration Tool

...........................................

133

Building the ROM images with ecosconfig

.......................................................................

133

Loading the ROM Image into On-board Flash

..................................................................

133

Building the Flash Downloader on Linux

..........................................................................

134

Developing eCos Programs with the ARM Multi-ICE

......................................................

135

Cirrus Logic ARM EP7212 Development Board Hardware Setup

.............................................

135

Cirrus Logic ARM EP7312 Development Board Hardware Setup

.............................................

136

90MHz Operation

..............................................................................................................

136

Cirrus Logic ARM EP7209 Development Board Hardware Setup

.............................................

137

Cirrus Logic ARM CL-PS7111 Evaluation Board Hardware Setup

...........................................

137

StrongARM EBSA-285 Hardware Setup

....................................................................................

137

Building the GDB Stub FLASH ROM images

..................................................................

138

Building the GDB Stubs with the eCos Configuration Tool

..............................................

138

Building the GDB Stub ROMs with ecosconfig

................................................................

138

Loading the ROM Image into On-board Flash

..................................................................

138

Running your eCos Program Using GDB and the StubROM

............................................

140

Compaq iPAQ PocketPC Hardware Setup

..................................................................................

140

Arm Industrial Module AIM 711 Hardware Setup

.....................................................................

140

Setup Hardware

..................................................................................................................

141

Power supply

............................................................................................................

141

Serial devices

............................................................................................................

141

Ethernet

....................................................................................................................

141

Installing RedBoot into FLASH

........................................................................................

141

Using RedBoot

.........................................................................................................

141

Using JTAG

..............................................................................................................

142

List of Tables

11-1. Configuration for various download methods

.........................................................................................

18-1. Cell types

.................................................................................................................................................

23-1. Keyboard accelerators

.............................................................................................................................

24-1. CDL Expressions

.....................................................................................................................................

24-2. Configuration properties

..........................................................................................................................

List of Figures

11-1. Configuration Tool

...................................................................................................................................

11-2. Template selection

...................................................................................................................................

11-3. Configuring for the target

........................................................................................................................

11-4. Selecting the Build Library menu item

...................................................................................................

11-5. Save file dialog

........................................................................................................................................

11-6. Build tools dialog

....................................................................................................................................

11-7. User tools dialog

......................................................................................................................................

11-8. Selecting the Build Tests menu item

.......................................................................................................

12-1. Run tests

..................................................................................................................................................

12-2. Properties dialog box

...............................................................................................................................

13-1. Two threads with simple print statements after random delays

..............................................................

15-1. Configuration Tool

...................................................................................................................................

15-2. Repository relocation dialog box

............................................................................................................

15-3. Save As dialog box

..................................................................................................................................

15-4. Open dialog box

......................................................................................................................................

16-1. HTML Help viewer

.................................................................................................................................

17-1. Settings dialog, Display tab

.....................................................................................................................

17-2. Settings dialog, Viewers tab

....................................................................................................................

19-1. Packages dialog box

................................................................................................................................

19-2. Platforms dialog box

...............................................................................................................................

19-3. Platform Modify dialog box

....................................................................................................................

19-4. Templates dialog box

...............................................................................................................................

19-5. Options

....................................................................................................................................................

19-6. Resolve conflicts window

........................................................................................................................

20-1. Find dialog box

........................................................................................................................................

21-1. Build tools

...............................................................................................................................................

21-2. User tools

.................................................................................................................................................

22-1. Properties dialog box

...............................................................................................................................

22-2. Run tests

..................................................................................................................................................

22-3. Add files from folder

...............................................................................................................................

25-1. Component repository

.............................................................................................................................

List of Examples

11-1. Getting help from ecosconfig

..................................................................................................................

11-2. ecosconfig output — list of available packages, targets and templates

...................................................

14-1. A sample program that creates an alarm

.................................................................................................

27-1. Hello world with tracing

..........................................................................................................................

27-2. Using instrument buffers

.........................................................................................................................

27-3. Instrument buffer output

..........................................................................................................................

28-1. eCos linker script fragment

...................................................................................................................

105

I. Introduction

Chapter 1. Key Features

• eCos is distributed under the GPL license with an exception which permits proprietary application code to be linked with eCos without itself being forced to be released under the GPL. It is also royalty and buyout free.

• As an Open Source project, eCos is under constant improvement, with an active developer community, based around the eCos web site at http://ecos.sourceware.org/.

• Powerful GUI-based configuration system allowing both large and fine grained configuration of eCos. This allows the functionality of eCos to be customized to the exact requirements of the application.

•

Full-featured, flexible, configurable, real time embedded kernel. The kernel provides thread scheduling, synchronization, timer, and communication primitives. It handles hardware resources such as interrupts, exceptions, memory and caches.

• The Hardware Abstraction Layer (HAL) hides the specific features of each supported CPU and platform, so that the kernel and other run-time components can be implemented in a portable fashion.

• Support for µITRON and POSIX Application Programmer Interfaces (APIs). It also includes a fully featured, thread-safe ISO standard C library and math library.

• Support for a wide variety of devices including many serial devices, ethernet controllers and FLASH memories. There is also support for PCMCIA, USB and PCI interconnects.

• A fully featured TCP/IP stack implementing IP, IPv6, ICMP, UDP and TCP over ethernet. Support for

SNMP, HTTP, TFTP and FTP are also present.

• The RedBoot ROM monitor is an application that uses the eCos HAL for portability. It provides serial and ethernet based booting and debug services during development.

• Many components include test programs that validate the components behaviour. These can be used both to check that hardware is functioning correctly, and as examples of eCos usage.

• eCos documentation included this User Guide, the Reference Manual and the Components Writer’s Guide.

These are being continually updated as the system develops.

Chapter 2. eCos Overview

eCos is an open source, configurable, portable, and royalty-free embedded real-time operating system. The following text expands on these core aspects that define eCos.

eCos is provided as an open source runtime system supported by the GNU open source development tools.

Developers have full and unfettered access to all aspects of the runtime system. No parts of it are proprietary or hidden, and you are at liberty to examine, add to, and modify the code as you deem necessary. These rights are granted to you and protected by the GNU Public License (GPL). An exception clause has been added to the eCos license which limits the circumstances in which the license applies to other code when used in conjunction with eCos. This exception grants you the right to freely develop and distribute applications based on eCos. You are not expected or required to make your embedded applications or any additional components that you develop freely available so long as they are not derived from eCos code. We of course welcome all contributions back to eCos such as board ports, device drivers and other components, as this helps the growth and development of eCos, and is of benefit to the entire eCos community. See

Chapter 3

for more details.

One of the key technological innovations in eCos is the configuration system. The configuration system allows the application writer to impose their requirements on the run-time components, both in terms of their functionality and implementation, whereas traditionally the operating system has constrained the application’s own implementation. Essentially, this enables eCos developers to create their own application-specific operating system and makes eCos suitable for a wide range of embedded uses. Configuration also ensures that the resource footprint of eCos is minimized as all unnecessary functionality and features are removed. The configuration system also presents eCos as a component architecture. This provides a standardized mechanism for component suppliers to extend the functionality of eCos and allows applications to be built from a wide set of optional configurable run-time components. Components can be provided from a variety of sources including: the standard eCos release; commercial third party developers or open source contributors.

The royalty-free nature of eCos means that you can develop and deploy your application using the standard eCos release without incurring any royalty charges. In addition, there are no up-front license charges for the eCos runtime source code and associated tools. We provide, without charge, everything necessary for basic embedded applications development.

eCos is designed to be portable to a wide range of target architectures and target platforms including 16, 32, and

64 bit architectures, MPUs, MCUs and DSPs. The eCos kernel, libraries and runtime components are layered on the Hardware Abstraction Layer (HAL), and thus will run on any target once the HAL and relevant device drivers have been ported to the target’s processor architecture and board. Currently eCos supports a large range of different target architectures:

• ARM, Intel StrongARM and XScale

• Fujitsu FR-V

• Hitachi SH2/3/4

• Hitachi H8/300H

• Intel x86

• MIPS

• Matsushita AM3x

• Motorola PowerPC

• Motorola 68k/Coldfire

• NEC V850

• Sun SPARC

Chapter 2. eCos Overview including many of the popular variants of these architectures and evaluation boards.

eCos has been designed to support applications with real-time requirements, providing features such as full preemptability, minimal interrupt latencies, and all the necessary synchronization primitives, scheduling policies, and interrupt handling mechanisms needed for these type of applications. eCos also provides all the functionality required for general embedded application support including device drivers, memory management, exception handling, C, math libraries, etc. In addition to runtime support, the eCos system includes all the tools necessary to develop embedded applications, including eCos software configuration and build tools, and GNU based compilers, assemblers, linkers, debuggers, and simulators.

To get the most out of eCos you should visit the eCos open source developers site: http://ecos.sourceware.org/.

The site is dedicated to the eCos developer community and contains a rich set of resources including news,

FAQ, online documentation, installation guide, discussion and announcement mailing lists, and runtime and development tools downloads. The site also supports anonymous CVS and WEBCVS access to provide direct access to the latest eCos source base.

eCos is released as open source software because we believe that this is the most effective software development model, and that it provides the greatest benefit to the embedded developer community as a whole.

As part of this endeavor, we seek the input and participation of eCos developers in its continuing evolution.

Participation can take many forms including:

• providing us with feedback on how eCos might be made more useful to you - by taking part in the ongoing mailing list discussions and by submitting problem reports covering bugs, documentation issues, and missing features

• contributing bug fixes and enhancement patches

• contributing new code including device drivers, board ports, libraries, and other runtime components

Our long term aim is to make eCos a rich and ubiquitous standard infrastructure for the development of deeply embedded applications. This will be achieved with the assistance of the eCos developer community cooperating to improve eCos for all. We would like to take this opportunity to extend our thanks to the many eCos developers who have already contributed feedback, ideas, patches, and code that have augmented and improved this release.

The eCos Maintainers

Chapter 3. eCos Licence Overview

As of May 2002, eCos is released under a modified version of the well known GNU General Public License

(GPL) (http://www.gnu.org/copyleft/gpl.html), now making it an official GPL-compatible Free Software License (http://www.gnu.org/philosophy/license-list.html). An exception clause has been added to the eCos license which limits the circumstances in which the license applies to other code when used in conjunction with eCos. The exception clause is as follows:

As a special exception, if other files instantiate templates or use macros or inline functions from this file, or you compile this file and link it with other works to produce a work based on this file, this file does not by itself cause the resulting work to be covered by the GNU General Public

License. However the source code for this file must still be made available in accordance with section (3) of the GNU General Public

License.

This exception does not invalidate any other reasons why a work based on this file might be covered by the GNU General Public License.

The goal of the license is to serve the eCos user community as a whole. It allows all eCos users to develop products without paying anybody anything, no matter how many developers are working on the product or how many units will be shipped. The license also guarantees that the eCos source code will always be freely available. This applies not only to the core eCos code itself but also to any changes that anybody makes to the core. In particular, it should prevent any company or individual contributing code to the system and then later claiming that all eCos users are now guilty of copyright or patent infringements and have to pay royalties. It should also prevent any company from making some small improvements, calling the result a completely new system, and releasing this under a new and less generous license.

The license does not require users to release the source code of any applications that are developed with eCos.

However, if anybody makes any changes to code covered by the eCos license, or writes new files derived in any way from eCos code, then we believe that the entire user community should have the opportunity to benefit from this. The license stipulates that these changes must be made available in source code form to all recipients of binaries based on the modified code, either by including the sources along with the binaries you deliver (or with any device containing such binaries) or with a written offer to supply the source code to the general public for three years. It is perhaps most practical for eCos developers to make the source code available online and inform those who are receiving binaries containing eCos code, and probably also the eCos maintainers, about the location of the code. See the full text of the GPL (http://www.gnu.org/copyleft/gpl.html) for the most authoritative definition of the obligations.

Although it is not strictly necessary to contribute the modified code back to the eCos open source project, we are always pleased to receive code contributions and hope that developers will also be keen to give back in return for what they received from the eCos project completely free of charge. The eCos maintainers are responsible for deciding whether such contributions should be applied to the public repository. In addition, a copyright assignment (http://ecos.sourceware.org/assign.html) is required for any significant changes to the core eCos packages.

The result is a royalty-free system with minimal obligations on the part of application developers. This has resulted in the rapid uptake of eCos. At the same time, eCos is fully open source with all the benefits that implies in terms of quality and innovation. We believe that this is a winning combination.

Chapter 3. eCos Licence Overview

Questions and answers

The following queries provide some clarification as to the implications of the eCos license. They do not consititute part of the legal meaning of the license.

Q. What is the effect of the eCos license?

A. In the simplest terms, when you distribute anything containing eCos code, you must make the source code to eCos available under the terms of the GPL.

Q. What if I make changes to eCos, or write new code based on eCos code?

A. Then you must make those changes available as well.

Q. Do I have to distribute the source code to my application? Isn’t the GPL "viral"?

A. You do not have to distribute any code under the terms of the GPL other than eCos code or code derived from eCos. For example, if you write a HAL port based on copying an existing eCos HAL in any way, you must make the source code available with the binary. However you would not need to make available any other code, such as the code of a wholly separate application linked with eCos.

Q. I would rather stick with the RHEPL code, but I updated my anonymous CVS checkout.

A. You can check out the final version of anonymous CVS before the license change using the CVS tag last-rhepl . See the anonymous CVS access page (http://ecos.sourceware.org/anoncvs.html) for details.

Previous License

Prior to May 2002, eCos was released under the Red Hat eCos Public License (RHEPL)

(http://ecos.sourceware.org/old-license.html). The RHEPL required any modifications to eCos code to be made available under preferential terms to Red Hat and was therefore incompatible with code licensed under the GPL. The use of eCos source code which was licensed under the RHEPL is not affected by the switch to the modified GPL for later revisions.

Chapter 4. Notation and Conventions

Since there are many supported target architectures, notation conventions are used in this manual to avoid repeating instructions that are very similar.

GDB and GCC Command Notation

Cross-development commands like gcc and gdb will be shown with a TARGETprefix. You need to replace

TARGETwith the correct prefix before using the command. Just using gcc or gdb will use the tools for the host, which is not (usually) what you want.

For example use arm-elf-gcc and arm-elf-gdb for ARM, Thumb, and StrongARM targets. Use xscale-elf-gcc and xscale-elf-gdb for Intel Xscale targets. Use i386-elf-gcc and i386-elf-gdb for IA32 targets. And so on, the exact prefix to use is shown in the documentation for each target.

Note that some versions of the GCC cross compiler generate executable files with the

.exe

suffix on Windows, but not on Linux. The suffix .exe

will be omitted from executable file names, so you will see hello instead of hello.exe

Directory and File System Conventions

The default directory for installing eCos on Windows (usually C:/Program Files/eCos ) is different from that on Linux (usually

/opt/ecos

). Since many command line examples in the tutorials use these paths, this default (base) directory will be cited as BASE_DIR .

Windows and Linux have a similar file system syntax, but the MS-DOS command interpreter on Windows uses the backslash character (\) as a path separator, while Linux and POSIX shells (including the Cygwin bash shell for windows) use the forward slash (/).

This document will use the POSIX shell convention of forward slashes throughout.

Version Conventions

This manual does not refer explicitly to any particular version of eCos. However, version numbers form part of many file path names. In all of these places the version number will be shown like this: <version> .

If you have used anonymous CVS to check eCos out of the CVS repository, the version number will always be current , since that is the name of the directory in the repository. When a stable release is made this directory name is changed, in the release, to the number of the release, for example v2_0 or v2_1 .

Chapter 5. Documentation Roadmap

The eCos documentation is divided into a three main parts:

User Guide

This document. It includes the following sections:

Installing eCos

This section describes how to install the eCos software, how to set up your hardware and how to test that it is all working.

Programming Under eCos

This section describes how to write programs that run under eCos by running through some examples.

The eCos Configuration Tool

This section describes the eCos graphical configuration tool and how to use it to change how eCos behaves.

eCos Programming Concepts and Techniques

An explanation of the eCos programming cycle, and a description of some debugging facilities that eCos offers.

Configuration and the Package Repository

Information on how to configure eCos manually, including a reference on the ecosconfig command, memory layouts, and information on how to manage a package repository using the eCos Package

Administration Tool.

Reference Guide

The Reference Guide provides detailed documentation on various aspects of eCos. This document is being constantly updated, so the following list just mentions the more important sections, take a look at the guide itself for the full story.

The eCos Kernel

In-depth description of eCos"s native C kernel API Important considerations are given for programming the eCos kernel. The semantics for each kernel function are described, including how they are affected by configuration.

POSIX and µITRON APIs

A description of the POSIX and µITRON APIs and how they are supported under eCos.

The eCos Hardware Abstraction Layer (HAL)

A description of the structure and functionality of the eCos HAL. This section also includes a porting guide to help moving eCos to different platforms.

Chapter 5. Documentation Roadmap

Device Drivers

A description of the philosophy behind eCos device drivers, as well as a presentation of the C language APIs for using the current device drivers.

Device driver support includes serial, ethernet and FLASH devices, and support for PCI, PCMCIA and USB interconnects.

RedBoot User’s Guide

This describes RedBoot, which provides a complete bootstrap environment for a range of embedded operating systems, such as embedded Linux and eCos, and includes facilities such as network downloading and debugging. It also provides a simple flash file system for boot images.

TCP/IP Stack Support

This describes the Common Networking for eCos package, which provides support for a complete

TCP/IP networking stack. The design allows for the actual stack to be modular and at the current time two different implementations, one based on OpenBSD from 2000 and a new version based on

FreeBSD, are available.

Other components related to networking, including support for SNMP, DNS, HTTP and FTP, are also described.

Component Writer’s Guide

The Component Writer’s Guide is intended for developers who need to add or modify parts of eCos itself.

It describes the following things:

Overview

An explanation of the configuration technology used in eCos, why it is done this way, how it works and the terminology used.

Package Organization

A description of the eCos package repository, how it is organized and how packages themselves are organized.

The CDL Language

A description of the CDL language and how it is used to control the configuration of eCos components. The document also contains a complete specification of the language.

The Build Process

A description of what happens once a configuration has been created and must be built into a set of executables.

II. Installing eCos

Chapter 6. System Requirements

• Standard Intel architecture PC running Linux (tested on recent Red Hat, SuSE and Debian distributions),

Microsoft Windows NT (no earlier than 4.0 + SP6a), Windows 2000 and Windows XP. Linux distributions from other vendors may also work, but are currently untested.

• Enough disk space for the installed distribution. The eCos installation process will detail the various components of eCos and the compiler toolkit that can be installed, and their disk space requirements.

• 64MB of RAM and a 350MHz or faster Pentium processor.

If you are downloading the eCos release distribution from ecos.sourceware.org (http://ecos.sourceware.org), you will also need space to store that image and to compile the toolchain and eCos from source.

Chapter 7. Installation on Linux

Full instructions for the downloading and installation of eCos (http://ecos.sourceware.org/getstart.html) on

Linux hosts are provided on the eCos website.

Chapter 8. Installation on Windows

Full instructions for the downloading and installation of eCos (http://ecos.sourceware.org/getstart.html) on

Windows hosts are provided on the eCos website.

Chapter 9. Target Setup

While eCos supports a variety of targets, communication with all the targets happens in one of four ways.

These are described in general below. Any details or variations from these descriptions will be found in the eCos documentation for a specific target, in the appendix.

Connecting Via Serial Line

Most targets will have RedBoot or GDB Stubs installed. These normally waits for GDB to connect at 38400 baud, using 8 data bit, no parity bit and 1 stop-bit and no hardware flow control. Check the documentation for your target to ensure it uses this speed. If not, adjust the following instructions accordingly.

The following instructions depend on your having selected the appropriate serial port on the host. That is, the serial port which connects to the target’s (primary) serial port. On Linux this could be

/dev/ttyS0

, while the same port on Windows would be named COM1. Substitute the proper serial port name in the below.

Connect to the target by issuing the following commands in GDB console mode:

(gdb) set remotebaud 38400

(gdb) target remote /dev/ttyS0

In Insight, connect by opening the File->Target Settings window and enter:

Target: Remote/Serial

Baud Rate: 38400

Port: /dev/ttyS0

Set other options according to preference, close the window and select Run->Connect to target.

Connecting Via Ethernet

Some targets allow GDB to connect via Ethernet - if so, it will be mentioned in the document describing the target. Substitute the target’s assigned IP address or hostname for <hostname> in the following. Depending on how RedBoot has been configured, it will either have this address allocated statically, or will acquire it via

BOOTP. In both cases RedBoot will report the IP address it is listening on in its startup message printed on the serial port. The <port> is the TCP port which RedBoot is listening on, usually 9000. It is also listed in the target document.

Connect to the target by issuing the following command in GDB console mode:

(gdb) target remote < hostname>: < port>

In Insight, connect by opening the File->Target Settings window and enter:

Target: Remote/TCP

Hostname: < hostname>

Port: < port>

Set other options according to preference, close the window and select Run->Connect to target.

Chapter 9. Target Setup

Using A Simulator Target

GDB connects to all simulator targets using the same basic command, although each simulator may require additional options. These are listed in the document describing the target, and should be used when connecting.

Connect to the target by issuing the following command in GDB console mode:

(gdb) target sim [target specific options]

In Insight, connect by opening the File->Target Settings window and enter:

Target: Simulator

Options: [target specific options]

Set other options according to preference, close the window and select Run->Connect to target.

Using A Synthetic Target

Synthetic targets are special in that the built tests and applications actually run as native applications on the host. This means that there is no target to connect to. The test or application can be run directly from the GDB console using:

(gdb) run or from Insight by pressing the Run icon. There is therefore no need to connect to the target or download the application, so you should ignore GDB “target” and “load” commands in any instructions found in other places in the documentation.

III. Programming With eCos

Chapter 10. Programming With eCos

The following chapters of this manual comprise a simple tutorial for configuring and building eCos, building and running eCos tests, and finally building three stand-alone example programs which use the eCos API to perform some simple tasks.

You will need a properly installed eCos system, with the correct versions of the GNU toolchain. On Windows you will be using the bash command line interpreter that comes with Cygwin, with the environment variables set as described in the toolchain documentation.

The Development Process

Most development projects using eCos would contain some (or most) of the following:

eCos Configuration

eCos is configured to provide the desired API (the inclusion of libc, uitron, and the disabling of certain undesired funtions, etc.), and semantics (selecting scheduler, mutex behavior, etc.). See

Chapter 11 .

It would normally make sense to enable eCos assertion checking at this time as well, to catch as many programming errors during the development phase as possible.

Note that it should not be necessary to spend much time on eCos configuration initially. It may be important to perform fine tuning to reduce the memory footprint and to improve performance later when the product reaches a testable state.

Integrity check of the eCos configuration

While we strive to thoroughly test eCos, the vast number of configuration permutations mean that the particular configuration parameters used for your project may not have been tested. Therefore, we advise running the eCos tests after the project’s eCos configuration has been determined. See

Chapter 12

Obviously, this should be repeated if the configuration changes later on in the development process.

Application Development - Target Neutral Part

While your project is probably targeting a specific architecture and platform, possibly custom hardware, it may be possible to perform part of the application development using simulated or synthetic targets.

There are three good reasons for doing this:

• It may be possible by this means to perform application development in parallel with the design/implementation of the target hardware, thus providing more time for developing and testing functionality, and reducing time-to-market.

• The build-run-debug-cycle may be faster when the application does not have to be downloaded to a target via a serial interface. Debugging is also likely to be more responsive when you do not have to to communicate with the remote GDB stubs in RedBoot via serial. It also removes the need for manually or automatically resetting the target hardware.

Chapter 10. Programming With eCos

• New hardware can often be buggy. Comparing the behaviour of the program on the hardware and in the simulator or synthetic target may allow you to identify where the problems lie.

This approach is possible because all targets (including simulators and synthetic ones) provide the same basic

API: that is, kernel, libc, libm, uitron, infra, and to some extent, HAL and IO.

Synthetic targets are especially suitable as they allow you to construct simulations of elaborate devices by interaction with the host system, where an IO device API can hide the details from the application. When switching to hardware later in the development cycle, the IO driver is properly implemented.

Simulators can also do this, but it all depends on the design and capabilities of the simulator you use. Some, like SID (http://sources.redhat.com/sid) or Bochs (http://bochs.sourceforge.net/) provide complete hardware emulation, while others just support enough of the instruction set to run compiled code.

Therefore, select a simulator or synthetic target and use it for as long as possible for application development.

That is, configure for the selected target, build eCos, build the application and link with eCos, run and debug.

Repeat the latter two steps until you are happy with it.

Obviously, at some time you will have to switch to the intended target hardware, for example when adding target specific feature support, for memory footprint/performance characterization, and for final tuning of eCos and the application.

Application Development - Target Specific Part

Repeat the build-run-debug-cycle while performing final tuning and debugging of application. Remember to disable eCos assertion checking if you are testing any performance-related aspects, it can make a big difference.

It may be useful to switch between this and the previous step repeatedly through the development process; use the simulator/synthetic target for actual development, and use the target hardware to continually check memory footprint and performance. There should be little cost in switching between the two targets when using two separate build trees.

Chapter 11. Configuring and Building eCos from

Source

This chapter documents the configuration of eCos. The process is the same for any of the supported targets: you may select a hardware target (if you have a board available), any one of the simulators, or a synthetic target

(if your host platform has synthetic target support).

eCos Start-up Configurations

There are various ways to download an executable image to a target board, and these involve different ways of preparing the executable image. In the eCos Hardware Abstraction Layer (HAL package) there are configuration options to support the different download methods.

Table 11-1

summarizes the ways in which an eCos image can be prepared for different types of download. This is not an exhaustive list, some targets define additional start-up types of their own. Where a ROM Monitor is mentioned, this will usually be RedBoot, although on some older, or low resource, targets you may need to use CygMon or the GDB stubs ROM, see the target documentation for details.

Table 11-1. Configuration for various download methods

Download method

Burn hardware ROM

Download to ROM emulator

Download to board with ROM Monitor

Download to simulator without ROM Monitor

Download to simulator with ROM Monitor

Download to simulator ignoring devices

Run synthetic target

HAL configuration

ROM or ROMRAM start-up

RAM start-up

ROM start-up

RAM start-up

SIM configuration

RAM start-up

Caution

You cannot run an application configured for RAM start-up on the simulator directly: it will fail during start-up. You can only download it to the simulator if you are already running RedBoot in the simulator, as described in the toolchain documentation or you load through the SID GDB debugging component. This is not the same as the simulated stub, since it does not require a target program to be running to get GDB to talk to it. It can be done before letting the simulator run or you use the ELF loader component to get a program into memory.

Note: Configuring eCos’ HAL package for simulation should rarely be needed for real development; binaries built with such a kernel will not run on target boards at all, and the MN10300 and TX39 simulators can run binaries built for stdeval1 and jmr3904 target boards. The main use for a “simulation” configuration is if you are trying to work around problems with the device drivers or with the simulator. Also note that when using a TX39 system configured for simulator start-up you should then invoke the simulator with the

--board=jmr3904pal option instead of --board=jmr3904

Chapter 11. Configuring and Building eCos from Source

Note: If your chosen architecture does not have simulator support, then the combinations above that refer to the simulator do not apply. Similarly, if your chosen platform does not have RedBoot ROM support, the combinations listed above that use RedBoot do not apply.

The debugging environment for most developers will be either a hardware board or the simulator, in which case they will be able to select a single HAL configuration.

Configuration Tool on Windows and Linux Quick Start

This section described the GUI based configuration tool. This tool is probably more suited to users who prefer

GUI’s. The next section describes a CLI based tool which Unix users may prefer.

Note that the use of the Configuration Tool is described in detail in

Part IV in eCos User Guide

The Configuration Tool (see

Figure 11-1

) has five main elements: the configuration window, the conflicts

window, the properties window, the short description window, and the output window.

Figure 11-1. Configuration Tool

Start by opening the templates window via Build->Templates . Select the desired target (see

Figure 11-2

Figure 11-2. Template selection

Chapter 11. Configuring and Building eCos from Source

Make sure that the configuration is correct for the target in terms of endianness, CPU model, Startup type, etc.

(see

Figure 11-3

Figure 11-3. Configuring for the target

Next, select the Build->Library menu item to start building eCos (see

Figure 11-4 ). The application will con-

figure the sources, prepare a build tree, and build the libtarget.a

library, which contains the eCos kernel and other packages.

Chapter 11. Configuring and Building eCos from Source

Figure 11-4. Selecting the Build Library menu item

The Save As dialog box will appear, asking you to specify a directory in which to place your save file. You can use the default, but it is a good idea to make a subdirectory, called ecos-work for example.

Figure 11-5. Save file dialog

The first time you build an eCos library for a specific architecture, the Configuration Tool may prompt you for the location of the appropriate build tools (including make and TARGETgcc) using a Build Tools dialog box

(as shown in

Figure 11-6

). You can select a location from the drop down list, browse to the directory using the

Browse button, or type in the location of the build tools manually.

Figure 11-6. Build tools dialog

Chapter 11. Configuring and Building eCos from Source

The Configuration Tool may also prompt you for the location of the user tools (such as cat and ls) using a User

Tools dialog box (as shown in

Figure 11-7 ). As with the Build Tools dialog, you can select a location from

the drop down list, browse to the directory using the Browse button, or type in the location of the user tools manually. Note that on Linux, this will often be unnecessary as the tools will already be on your PATH.

Figure 11-7. User tools dialog

When the tool locations have been entered, the Configuration Tool will configure the sources, prepare a build tree, and build the libtarget.a

library, which contains the eCos kernel and other packages.

The output from the configuration process and the building of libtarget.a

will be shown in the output window.

Once the build process has finished you will have a kernel with other packages in libtarget.a

. You should now build the eCos tests for your particular configuration.

You can do this by selecting Build -> Tests. Notice that you could have selected Tests instead of Library in the earlier step and it would have built both the library and the tests, but this would increase the build time substantially, and if you do not need to build the tests it is unnecessary.

Figure 11-8. Selecting the Build Tests menu item

Chapter 12

will guide you through running one of the test cases you just built on the selected target, using

GDB.

Chapter 11. Configuring and Building eCos from Source

Ecosconfig on Windows and Linux Quick Start

As an alternative to using the graphical Configuration Tool, it is possible to configure and build a kernel by editing a configuration file manually and using the ecosconfig command. Users with a Unix background may find this tool more suitable than the GUI tool described in the previous section.

Manual configuration and the ecosconfig command are described in detail in

Chapter 28

To use the ecosconfig command you need to start a shell. In Windows you need to start a CygWin bash shell, not a DOS command line.

The following instructions assume that the PATH and ECOS_REPOSITORY environment variables have been setup correctly as described in

Chapter 7

. They also assume Linux usage but equally well apply to Windows running

Cygwin.

Before invoking ecosconfig you need to choose a directory in which to work. For the purposes of this tutorial, the default path will be

BASE_DIR/ecos-work

. Create this directory and change to it by typing:

$ mkdir BASE_DIR/ecos-work

$ cd BASE_DIR/ecos-work

To see what options can be used with ecosconfig, type:

$ ecosconfig --help

The available packages, targets and templates may be listed as follows:

$ ecosconfig list

Here is sample output from ecosconfig showing the usage message.

Example 11-1. Getting help from ecosconfig

$ ecosconfig --help

Usage: ecosconfig [ qualifier ... ] [ command ] commands are: list new TARGET [ TEMPLATE [ VERSION ] ] target TARGET

: list repository contents

: create a configuration

: change the target hardware template TEMPLATE [ VERSION ] add PACKAGE [ PACKAGE ... ] remove PACKAGE [ PACKAGE ... ] version VERSION PACKAGE [ PACKAGE ... ] export FILE import FILE

: change the template

: add package(s)

: remove package(s)

: change version of package(s)

: export minimal config info

: import additional config info

: check the configuration

: resolve conflicts

: create a build tree check resolve tree qualifiers are:

--config=FILE

--prefix=DIRECTORY

--srcdir=DIRECTORY

--no-resolve resolution

--version

: the configuration file

: the install prefix

: the source repository

: disable conflict

: show version and copyright

Chapter 11. Configuring and Building eCos from Source

Example 11-2. ecosconfig output — list of available packages, targets and templates

$ ecosconfig list

Package CYGPKG_CYGMON (CygMon support via eCos): aliases: cygmon versions: <version>

Package CYGPKG_DEVICES_WALLCLOCK_DALLAS_DS1742 (Wallclock driver for Dallas 1742): aliases: devices_wallclock_ds1742 device_wallclock_ds1742 versions: <version>

Package CYGPKG_DEVICES_WALLCLOCK_SH3 (Wallclock driver for SH3 RTC module): aliases: devices_wallclock_sh3 device_wallclock_sh3 versions: <version>

Package CYGPKG_DEVICES_WATCHDOG_ARM_AEB (Watchdog driver for ARM/AEB board): aliases: devices_watchdog_aeb device_watchdog_aeb versions: <version>

Package CYGPKG_DEVICES_WATCHDOG_ARM_EBSA285 (Watchdog driver for ARM/EBSA285 board): aliases: devices_watchdog_ebsa285 device_watchdog_ebsa285 versions: <version>

...

Selecting a Target

To configure for a listed target, type:

$ ecosconfig new < target>

For example, to configure for the ARM PID development board, type:

$ ecosconfig new pid

You can then edit the generated file, ecos.ecc

, setting the options as required for the target (endianess, CPU model, Startup type, etc.). For detailed information about how to edit the ecos.ecc

file, see the CDL Writer’s

Guide and

the section called Editing an eCos Savefile in Chapter 28

Create a build tree for the configured target by typing:

$ ecosconfig tree

If there are any problem with the configuration, ecosconfig will tell you. The most likely cause of this is mistakes when editing the ecos.ecc

file. You can check whether the configuration you have made is correct, without building the tree with the following command:

$ ecosconfig check

If this reports any conflicts you can get ecosconfig to try and resolve them itself by typing:

$ ecosconfig resolve

See

the section called Conflicts and constraints in Chapter 28

for more details.

You can now run the command make or make tests, after which you will be at the same point you would be after running the Configuration Tool — you can start developing your own applications, following the steps in

Chapter 13

The procedure shown above allows you to do very coarse-grained configuration of the eCos kernel: you can select which packages to include in your kernel, and give target and start-up options. But you cannot select components within a package, or set the very fine-grained options.

Chapter 11. Configuring and Building eCos from Source

To select fine-grained configuration options you will need to edit the configuration file ecos.ecc

in the current directory and regenerate the build tree.

Caution

You should follow the manual configuration process described above very carefully, and you should read the comments in each file to see when one option depends on other options or packages being enabled or disabled. If you do not, you might end up with an inconsistently configured kernel which could fail to build or might execute incorrectly.

Chapter 12. Running an eCos Test Case

the section called Configuration Tool on Windows and Linux Quick Start in Chapter 11

the section called

Ecosconfig on Windows and Linux Quick Start in Chapter 11

you created the eCos test cases as part of the build process. Now it is time to try and run one.

Using the Configuration Tool

Test executables that have been linked using the Build->Tests operation against the current configuration can be executed by selecting Tools->Run Tests.

When a test run is invoked, a property sheet is displayed, see

Figure 12-1 . Press the Uncheck All button and

then find and check just one test, bin_sem0 for example.

Figure 12-1. Run tests

Now press the Properties button to set up communications with the target. This will bring up a properties dialog shown in

Figure 12-2

. If you have connected the target board via a serial cable, check the Serial radio button, and select the serial port and baud rate for the board. If the target is connected via the network select the TCP/IP button and enter the IP address that the board has been given, and the port number (usually 9000).

Figure 12-2. Properties dialog box

Chapter 12. Running an eCos Test Case

Click OK on this dialog and go back to the Run Tests dialog. Press the Run button and the selected test will be downloaded and run. The Output tab will show you how this is progressing. If it seems to stop for a long time, check that the target board is correctly connected, and that eCos has been correctly configured -- especially the start-up type.

When the program runs you should see a couple of line similar to this appear:

PASS: < Binary Semaphore 0 OK >

EXIT: < done >

This indicates that the test has run successfully.

See

Chapter 22

for further details.

Using the command line

Start a command shell (such as a Cygwin shell window in Windows) with the environment variables set as described in the toolchain documentation. Change to the directory in which you set up your build tree, and invoke GDB on the test program.

To run the bin_sem0 test (which will test the kernel for the correct creation and destruction of binary semaphores) type:

$ TARGET-gdb -nw install/tests/kernel/<version>/tests/bin_sem0

You should see output similar to the following in the command window:

GNU gdb THIS-GDB-VERSION

GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions.

Type "show copying" to see the conditions.

There is absolutely no warranty for GDB.

Type "show warranty" for details.

This GDB was configured as "--host=THIS-HOST --target=THIS-TARGET".

(gdb)

Chapter 12. Running an eCos Test Case

If you are trying to run a synthetic target test on Linux, skip the following connection and download steps.

Otherwise, connect to the target by typing:

(gdb) set remotebaud 38400

(gdb) target remote /dev/ttyS0 on Linux or

(gdb) set remotebaud 38400

(gdb) target remote com1 on Windows or

(gdb) target sim to use a simulator in either host O/S.

Check the documentation for the target board for the actual baud rate to use when connecting to real targets.

You will see output similar to the following:

Remote debugging using /dev/ttyS1

0x0000d50c in ?? () at BASE_DIR/kernel/<version>/src/common/kapi.cxx:345

Current language: auto; currently c++

(gdb)

Or if you are using the simulator:

Connected to the simulator.

(gdb)

Now download the program to the target with

(gdb) load

You should see output similar to the following on your screen:

Loading section .text, size 0x4b04 lma 0x108000

Loading section .rodata, size 0x738 lma 0x10cb08

Loading section .data, size 0x1c0 lma 0x10d240

Start address 0x108000, load size 21500

Transfer rate: 24571 bits/sec, 311 bytes/write.

(gdb)

You are now ready to run your program. If you type:

(gdb) continue you will see output similar to the following:

Continuing.

PASS: < Binary Semaphore 0 OK >

EXIT: < done >

Note: If you are using a simulator or the synthetic target rather than real hardware, you must use the GDB command “run” rather than “continue” to start your program.

Chapter 12. Running an eCos Test Case

You can terminate your GDB session with Control+C, otherwise it will sit in the “idle” thread and use up CPU time. This is not a problem with real targets, but may have undesirable effects in simulated or synthetic targets.

Type quit and you are done.

Testing Filters

While most test cases today run solely in the target environment, some packages may require external testing infrastructure and/or feedback from the external environment to do complete testing.

The serial package is an example of this. The network package also contains some tests that require programs to be run on a host. See the network Tests and Demonstrations section in the network documentation in the

eCos Reference Guide. Here we will concentrate on the serial tests since these are applicable to more targets.

Since the serial line is also used for communication with GDB, a filter is inserted in the communication pathway between GDB and the serial device which is connected to the hardware target. The filter forwards all communication between the two, but also listens for special commands embedded in the data stream from the target.

When such a command is seen, the filter stops forwarding data to GDB from the target and enters a special mode. In this mode the test case running on the target is able to control the filter, commanding it to run various tests. While these tests run, GDB is isolated from the target.

As the test completes (or if the filter detects a target crash) the communication path between GDB and the hardware target is re-established, allowing GDB to resume control.

In theory, it is possible to extend the filter to provide a generic framework for other target-external testing components, thus decoupling the testing infrastructure from the (possibly limited) communication means provided by the target (serial, JTAG, Ethernet, etc).

Another advantage is that the host tools do not need to know about the various testing environments required by the eCos packages, since all contact with the target continues to happen via GDB.

Chapter 13. Building and Running Sample

Applications

The example programs in this tutorial are included, along with a

Makefile

, in the examples directory of the eCos distribution. The first program you will run is a hello world-style application, then you will run a more complex application that demonstrates the creation of threads and the use of cyg_thread_delay(), and finally you will run one that uses clocks and alarm handlers.

The Makefile depends on an externally defined variable to find the eCos library and header files. This variable is INSTALL_DIR and must be set to the pathname of the install directory created in

the section called

Configuration Tool on Windows and Linux Quick Start in Chapter 11

INSTALL_DIR may be either be set in the shell environment or may be supplied on the command line. To set it in the shell do the following in a bash shell:

$ export INSTALL_DIR=BASE_DIR/ecos-work/arm_install

You can then run make without any extra parameters to build the examples.

Alternatively, if you can do the following:

$ make INSTALL_DIR=BASE_DIR/ecos-work/arm_install

eCos Hello World

The following code is found in the file hello.c

in the examples directory:

eCos hello world program listing

/* this is a simple hello world program */

#include < stdio.h> int main(void)

{ printf("Hello, eCos world!\n"); return 0;

}

To compile this or any other program that is not part of the eCos distribution, you can follow the procedures described below. Type this explicit compilation command (assuming your current working directory is also where you built the eCos kernel):

$ TARGET-gcc -g -IBASE_DIR/ecos-work/install/include hello.c -LBASE_DIR/ecos-work/install/lib -Ttarget.ld -nostdlib

The compilation command above contains some standard GCC options (for example, -g enables debugging), as well as some mention of paths ( -IBASE_DIR/ecos-work/install/include allows files like cyg/kernel/kapi.h

to be found, and -LBASE_DIR/ecos-work/install/lib allows the linker to find

-Ttarget.ld

The executable program will be called a.out

Note: Some target systems require special options to be passed to gcc to compile correctly for that system.

Please examine the Makefile in the examples directory to see if this applies to your target.

Chapter 13. Building and Running Sample Applications

You can now run the resulting program using GDB in exactly the same the way you ran the test case before.

The procedure will be the same, but this time run TARGETgdb specifying

-nw a.out

on the command line:

$ TARGET-gdb -nw a.out

For targets other than the synthetic linux target, you should now run the usual GDB commands described earlier. Once this is done, typing the command "continue" at the (gdb) prompt ("run" for simulators) will allow the program to execute and print the string "Hello, eCos world!" on your screen.

On the synthetic linux target, you may use the "run" command immediately - you do not need to connect to the target, nor use the "load" command.

A Sample Program with Two Threads

Below is a program that uses some of eCos’ system calls. It creates two threads, each of which goes into an infinite loop in which it sleeps for a while (using cyg_thread_delay()). This code is found in the file twothreads.c

in the examples directory.

eCos two-threaded program listing

#include < cyg/kernel/kapi.h>

#include < stdio.h>

#include < math.h>

#include < stdlib.h>

/* now declare (and allocate space for) some kernel objects, like the two threads we will use */ cyg_thread thread_s[2]; /* space for two thread objects */ char stack[2][4096]; /* space for two 4K stacks */

/* now the handles for the threads */ cyg_handle_t simple_threadA, simple_threadB;

/* and now variables for the procedure which is the thread */ cyg_thread_entry_t simple_program;

/* and now a mutex to protect calls to the C library */ cyg_mutex_t cliblock;

/* we install our own startup routine which sets up threads */ void cyg_user_start(void)

{ printf("Entering twothreads’ cyg_user_start() function\n"); cyg_mutex_init(&cliblock); cyg_thread_create(4, simple_program, (cyg_addrword_t) 0,

"Thread A", (void *) stack[0], 4096,

&simple_threadA, &thread_s[0]); cyg_thread_create(4, simple_program, (cyg_addrword_t) 1,

"Thread B", (void *) stack[1], 4096,

&simple_threadB, &thread_s[1]); cyg_thread_resume(simple_threadA);

Chapter 13. Building and Running Sample Applications

} cyg_thread_resume(simple_threadB);

/* this is a simple program which runs in a thread */ void simple_program(cyg_addrword_t data)

{ int message = (int) data; int delay; printf("Beginning execution; thread data is %d\n", message); cyg_thread_delay(200); for (;;) { delay = 200 + (rand() % 50);

/* note: printf() must be protected by a call to cyg_mutex_lock() */ cyg_mutex_lock(&cliblock); { printf("Thread %d: and now a delay of %d clock ticks\n", message, delay);

} cyg_mutex_unlock(&cliblock); cyg_thread_delay(delay);

}

When you run the program (by typing continue at the (gdb) prompt) the output should look like this:

Starting program: BASE_DIR/examples/twothreads.exe

Entering twothreads’ cyg_user_start() function

Beginning execution; thread data is 0

Beginning execution; thread data is 1

Thread 0: and now a delay of 240 clock ticks

Thread 1: and now a delay of 225 clock ticks

Thread 1: and now a delay of 234 clock ticks

Thread 0: and now a delay of 231 clock ticks

Thread 1: and now a delay of 224 clock ticks

Thread 0: and now a delay of 249 clock ticks

Thread 1: and now a delay of 202 clock ticks

Thread 0: and now a delay of 235 clock ticks

Note: When running in a simulator the delays might be quite long. On a hardware board (where the clock speed is 100 ticks/second) the delays should average to about 2.25 seconds. In simulation, the delay will depend on the speed of the host processor and will almost always be much slower than the actual board.

You might want to reduce the delay parameter when running in simulation.

Figure 13-1

shows how this multitasking program executes. Note that apart from the thread creation system calls, this program also creates and uses a mutex for synchronization between the printf() calls in the two threads. This is because the C library standard I/O (by default) is configured not to be thread-safe, which means that if more than one thread is using standard I/O they might corrupt each other. This is fixed by a mutual exclusion (or mutex) lockout mechanism: the threads do not call printf() until cyg_mutex_lock() has returned, which only happens when the other thread calls cyg_mutex_unlock()

You could avoid using the mutex by configuring the C library to be thread-safe (by selecting the component

CYGSEM_LIBC_STDIO_THREAD_SAFE_STREAMS ).

Chapter 13. Building and Running Sample Applications

Figure 13-1. Two threads with simple print statements after random delays

Chapter 14. More Features — Clocks and Alarm

Handlers

If a program wanted to execute a task at a given time, or periodically, it could do it in an inefficient way by sitting in a loop and checking the real-time clock to see if the proper amount of time has elapsed. But operating systems usually provide system calls which allow the program to be informed at the desired time.

eCos provides a rich timekeeping formalism, involving counters, clocks, alarms, and timers. The precise definition, relationship, and motivation of these features is beyond the scope of this tutorial, but these examples illustrate how to set up basic periodic tasks.

Alarms are events that happen at a given time, either once or periodically. A thread associates an alarm handling function with the alarm, so that the function will be invoked every time the alarm “goes off”.

A Sample Program with Alarms

simple-alarm.c

(in the examples directory) is a short program that creates a thread that creates an alarm. The alarm is handled by the function test_alarm_func() , which sets a global variable. When the main thread of execution sees that the variable has changed, it prints a message.

Example 14-1. A sample program that creates an alarm

/* this is a very simple program meant to demonstrate a basic use of time, alarms and alarm-handling functions in eCos */

#include < cyg/kernel/kapi.h>

#include < stdio.h>

#define NTHREADS 1

#define STACKSIZE 4096 static cyg_handle_t thread[NTHREADS]; static cyg_thread thread_obj[NTHREADS]; static char stack[NTHREADS][STACKSIZE]; static void alarm_prog( cyg_addrword_t data );

/* we install our own startup routine which sets up threads and starts the scheduler */ void cyg_user_start(void)

{

} cyg_thread_create(4, alarm_prog, (cyg_addrword_t) 0,

"alarm_thread", (void *) stack[0],

STACKSIZE, &thread[0], &thread_obj[0]); cyg_thread_resume(thread[0]);

/* we need to declare the alarm handling function (which is defined below), so that we can pass it to cyg_alarm_initialize() */ cyg_alarm_t test_alarm_func;

/* alarm_prog() is a thread which sets up an alarm which is then handled by test_alarm_func() */

Chapter 14. More Features — Clocks and Alarm Handlers static void alarm_prog(cyg_addrword_t data)

{ cyg_handle_t test_counterH, system_clockH, test_alarmH; cyg_tick_count_t ticks; cyg_alarm test_alarm; unsigned how_many_alarms = 0, prev_alarms = 0, tmp_how_many; system_clockH = cyg_real_time_clock(); cyg_clock_to_counter(system_clockH, &test_counterH); cyg_alarm_create(test_counterH, test_alarm_func,

(cyg_addrword_t) &how_many_alarms,

&test_alarmH, &test_alarm); cyg_alarm_initialize(test_alarmH, cyg_current_time()+200, 200);

/* get in a loop in which we read the current time and print it out, just to have something scrolling by */ for (;;) { ticks = cyg_current_time(); printf("Time is %llu\n", ticks);

/* note that we must lock access to how_many_alarms, since the alarm handler might change it. this involves using the annoying temporary variable tmp_how_many so that I can keep the critical region short */ cyg_scheduler_lock(); tmp_how_many = how_many_alarms; cyg_scheduler_unlock(); if (prev_alarms != tmp_how_many) { printf(" --- alarm calls so far: %u\n", tmp_how_many); prev_alarms = tmp_how_many;

} cyg_thread_delay(30);

}

/* test_alarm_func() is invoked as an alarm handler, so it should be quick and simple. in this case it increments the data that is passed to it. */ void test_alarm_func(cyg_handle_t alarmH, cyg_addrword_t data)

{

}

++*((unsigned *) data);

When you run this program (by typing continue at the (gdb) prompt) the output should look like this:

Starting program: BASE_DIR/examples/simple-alarm.exe

Time is 0

Time is 30

Time is 60

Time is 90

Time is 120

Time is 150

Time is 180

Time is 210

--- alarm calls so far: 1

Time is 240

Time is 270

Time is 300

Time is 330

Time is 360

Time is 390

Time is 420

Chapter 14. More Features — Clocks and Alarm Handlers

--- alarm calls so far: 2

Time is 450

Time is 480

Note: When running in a simulator the delays might be quite long. On a hardware board (where the clock speed is 100 ticks/second) the delays should average to about 0.3 seconds (and 2 seconds between alarms). In simulation, the delay will depend on the speed of the host processor and will almost always be much slower than the actual board. You might want to reduce the delay parameter when running in simulation.

Here are a few things you might notice about this program:

• It used the cyg_real_time_clock() function; this always returns a handle to the default system real-time clock.

• Clocks are based on counters, so the function cyg_alarm_create() uses a counter handle. The program used the function cyg_clock_to_counter() to strip the clock handle to the underlying counter handle.

• Once the alarm is created it is initialized with cyg_alarm_initialize() , which sets the time at which the alarm should go off, as well as the period for repeating alarms. It is set to go off at the current time and then to repeat every 200 ticks.

• The alarm handler function test_alarm_func() conforms to the guidelines for writing alarm handlers and other delayed service routines: it does not invoke any functions which might lock the scheduler. This is discussed in detail in the eCos Reference Manual, in the chapter The eCos Kernel.

• There is a critical region in this program: the variable how_many_alarms is accessed in the main thread of control and is also modified in the alarm handler. To prevent a possible (though unlikely) race condition on this variable, access to how_many_alarms in the principal thread is protected by calls to cyg_scheduler_lock() and cyg_scheduler_unlock()

. When the scheduler is locked, the alarm handler will not be invoked, so the problem is averted.

IV. The eCos Configuration Tool

Chapter 15. Getting Started

Introduction

The eCos Configuration Tool is used to tailor eCos at source level, prior to compilation or assembly, and provides a configuration file and a set of files used to build user applications. The sources and other files used for building a configuration are provided in a component repository, which is loaded when the eCos Configuration

Tool is invoked. The component repository includes a set of files defining the structure of relationships between the Configuration Tool and other components, and is written in a Component Definition Language (CDL). For a description of the concepts underlying component configuration, see

Chapter 24 .

Invoking the eCos Configuration Tool

On Linux

Add the eCos Configuration Tool install directory to your PATH, for example: export PATH=/opt/ecos/ecos<version>/bin:$PATH

You may run configtool with zero, one or two arguments. You can specify the eCos repository location, and/or an eCos save file (extension .ecc) on the command line. The ordering of these two arguments is not significant.

For example: configtool /opt/ecos/ecos<version>/packages myfile.ecc

The Configuration Tool will be displayed (see

Figure 15-1 ).

On Windows

There are two ways in which to invoke the eCos Configuration Tool:

• from the desktop explorer or program set up at installation time (by default Start -> Programs -> eCos ->

Configuration Tool ).

• type (at a command prompt or in the Start menu’s Run item): <foldername>\ConfigTool.exe where

<foldername> is the full path of the directory in which you installed the eCos Configuration Tool.

• The Configuration Tool will be displayed (see

Figure 15-1 ).

For example: configtool "c:\Program Files\eCos\packages" myfile.ecc

If you invoke the configuration tool from the command line with --help, you will see this output:

Usage: eCos Configuration Tool [-h] [-e] [-v] [-c] [input file 1] [input file 2]

-h --help displays help on the command line parameters

-e --edit-only edit save file only

Chapter 15. Getting Started

-v --version print version

-c --compile-help compile online help only

This summarizes valid parameters and switches. Switches are shown with both short form and long form.

--help shows valid options and parameters, as above.

--edit-only runs the Configuration Tool in a mode that suppresses creation of a build tree, in case you only want to create and edit save files.

--version shows version and build date information, and exits.

--compile-help compiles help contents files from the HTML documentation files that the tool finds in the eCos repository, and exits.

Figure 15-1. Configuration Tool

The Component Repository

When you invoke the eCos Configuration Tool, it accesses the Component Repository, a read-only location of configuration information. For an explanation of “Component Repository” see

Chapter 24

The eCos Configuration Tool will look for a component repository using (in descending order of preference):

• A location specified on the command line

• The component repository most recently used by the current user

• An eCos distribution under /opt/ecos (under Linux) or a default location set by the installation procedure

(under Windows)

• User input

Chapter 15. Getting Started

The final case above will normally only occur if the previous repository has been moved or (under Windows) installation information stored in the Windows registry has been modified; it will result in a dialog box being displayed that allows you to specify the repository location:

Figure 15-2. Repository relocation dialog box

Note that in order to use the eCos Configuration Tool you are obliged to provide a valid repository location.

In the rare event that you subsequently wish to change the component location, select Build->Repository and the above dialog box will then be displayed.

You can check the location of the current repository, the current save file path, and the current hardware template and default package, by selecting Help->Repository Information.... A summary will be displayed.

eCos Configuration Tool Documents

Configuration Save File

eCos configuration settings and other information (such as disabled conflicts) that are set using the eCos Configuration Tool are saved to a file between sessions. By default, when the eCos Configuration Tool is first invoked, it reads and displays information from the Component Registry and displays the information in an untitled blank document. You can perform the following operations on a document:

Save the currently active document

Use the “File->Save” menu item or click the Save Document icon on the toolbar; if the current document is unnamed, you will be prompted to supply a name for the configuration save file.

Figure 15-3. Save As dialog box

Chapter 15. Getting Started

Open an existing document

Select File->Open, or click the Open Document icon on the toolbar. You will be prompted to supply a name for the configuration save file.

Figure 15-4. Open dialog box

Open a document you have used recently

Click its name at the bottom of the File menu.

Documents may also be opened by:

• double-clicking a Configuration Save File in the desktop explorer (Windows only);

Chapter 15. Getting Started

• invoking the eCos Configuration Tool with the name of a Configuration File as command-line argument, or by creating a shortcut to the eCos Configuration Tool with such an argument (under Windows or a suitable

Linux desktop environment).

Create a new blank document based on the Component Registry

Select File->New, or click the New Document icon on the toolbar.

Save to a different file name

Select File->Save As. You will be prompted to supply a new name for the configuration save file.

Build and Install Trees

The location of the build and install trees are derived from the eCos save file name as illustrated in the following example:

Save file name = “c:\My eCos\config1.ecc”

Install tree folder = “c:\My eCos\config1_install”

Build tree folder = “c:\My eCos\config1_build”

These names are automatically generated from the name of the save file.

Chapter 16. Getting Help

The eCos Configuration Tool contains several methods for accessing online help.

Context-sensitive Help for Dialogs

Most dialogs displayed by the eCos Configuration Tool are supplied with context-sensitive help. You can then get help relating to any control within the current dialog box by

• Right-clicking the control (or pressing F1 )

A “What’s This?” popup menu will be displayed. Click the menu to display a brief description of the function of the selected control.

• Clicking the question mark icon in the dialog caption bar (Windows) or the question mark button on the dialog (Linux).

A question mark cursor will be displayed. Click on any control to display a brief description of its function.

Some dialogs may have a Help button. You can press this to display a more general description of the function of the dialog box as a whole. This help will be in HTML form; for more information, see below.

Context-sensitive Help for Other Windows

In the Help menu, click Help On... and then click on a window (or click on the arrow/question mark button on the toolbar, then click on a window). A small popup window page describing the window will be displayed.

The same thing can be achieved by right-clicking on a window and clicking on What’s This?.

Context-sensitive Help for Configuration Items

In the configuration window, right-click on a configuration item (or use Shift+F10). A context menu will be displayed; select Visit Documentation to display the page in the eCos documentation that most closely corresponds to the selected item.

Methods of Displaying HTML Help

1. Using the internal help system. This will show an internal viewer similar to Microsoft HTML Help, with a contents hierarchy on the left and HTML pages on the right; see

Figure 16-1

. The index is regenerated for each repository. If the documentation in the repository has changed but the contents does not reflect this, please use the Tools Regenerate Help Index menu item.

2. Using the default HTML browser. On Unix, you will need a .mailcap entry similar to this: text/html; netscape -no-about-splash %s

3. Using the specified browser.

Figure 16-1. HTML Help viewer

Chapter 16. Getting Help

If you wish, you may choose to have HTML Help displayed in a browser of your choice. To do this, select

View->Settings and use the controls in the View Documentation group to select the replacement browser. Note that the Navigation facilities of the built-in HTML Help system will be unavailable if you choose this method of displaying help.

Chapter 17. Customization

The following visual aspects of the eCos Configuration Tool can be changed to suit individual preferences.

These aspects are saved on a per-user basis, so that when the eCos Configuration Tool is next invoked by the same user, the appearance will be as set in the previous session.

Window Placement

The relative sizes of all windows in the eCos Configuration Tool may be adjusted by dragging the splitter bars that separate the windows. The chosen sizes will be used the next time the eCos Configuration Tool is invoked by the current user.

All windows except the Configuration Window may be shown or hidden by using the commands under the

View menu (for example, View->Output) or the corresponding keyboard accelerators (Alt+1 to Alt+4).

Your chosen set of windows (and their relative sizes) will be preserved between invocations of the eCos Configuration Tool.

Settings

To change other visual aspects, select View->Settings and then select the Display and View tabs depending on the settings you wish to alter.. The options are as follows:

Settings: Display tab

Figure 17-1. Settings dialog, Display tab

Chapter 17. Customization

Labels

In the configuration window, you can choose to have either descriptive names (the default) or macro names displayed as tree item labels. Descriptive names are generally more comprehensible, but macro names are used in some contexts such as conflict resolution and may be directly related to the source code of the configuration.

Note that it is possible to search for an item in the configuration view by selecting Find->Edit (see

Chapter

). Both descriptive names and macro names can be searched.

Integer Items

You can choose to have integer items in the Configuration Window displayed in decimal or hexadecimal format.

Font

Change the font for a particular window by selecting the window name using the drop-down list, then clicking on Change Font to select a font for that window. The changes will be applied when the press OK to dismiss the Settings dialog. If you never make font changes, then the windows will take the default setting determined by your current Windows or Unix environment.

Miscellaneous

If the Splash Screen checkbox is checked, a splash window will appear as the application is loading. Uncheck this to eliminate the splash screen.

Settings: Viewers tab

Figure 17-2. Settings dialog, Viewers tab

Chapter 17. Customization

View header files

You can change the viewer used to display header files.

View documentation

You can change the viewer used to display HTML files. See

the section called Methods of Displaying HTML

Help in Chapter 16 .

Chapter 18. Screen Layout

The following windows are available within the eCos Configuration Tool:

•

Configuration Window

Properties Window

• Short Description

Conflicts •

• Output

The layout of the windows may be adjusted to suit your preferences: see

the section called Settings in Chapter

Configuration Window

This is the principal window used to configure eCos. It takes the form of a tree-based representation of the configuration items within the currently loaded eCos packages.

In the case of items whose values may be changed, controls are available to set the item values. These either take the form of check boxes or radio buttons within the tree itself or cells to the right of the thin vertical splitter bar. Controls in the tree may be used in the usual way; cells, however, must first be activated.

To activate a cell, simply click on it: it will assume a sunken appearance and data can then be edited in the cell. To terminate in-cell editing, click elsewhere in the configuration window or press ENTER. To discard the partial results of in-cell editing and revert to the previous value, press ESCAPE.

Cells come in three varieties, according to the type of data they accept:

Table 18-1. Cell types

Chapter 18. Screen Layout

Cell Type

Integer

Floating Point

String

Data Accepted

Decimal or hexadecimal values

Floating point values

Any

In the case of string cells, you can double-click the cell to display a dialog box containing a larger region in which to edit the string value. This is useful in the case of long strings, or those spanning multiple lines.

Disabled items

Some items will appear disabled. In this case the item label and any associated controls and cells will be grayed. It is not be possible to change the values of disabled items.

Right-Clicking

You can right-click on an item in the configuration window item to display a pop-up menu which (depending on the type of the item selected) allows you to:

• Properties – information relating to the currently selected item is displayed. The information is equivalent to that displayed in the Properties Window.

• Restore Defaults - the default value of the currently selected item is restored.

• Visit Documentation - causes the HTML page most closely relating to the currently selected item to be displayed. This has the same effect as double-clicking the URL property in the Properties Window.

• View Header File – this causes the file containing the items to be displayed. This is equivalent to doubleclicking on the File property in the Properties Window. The viewer used for this purpose may be changed using the View->Settings menu item (see

the section called Settings in Chapter 17 ). Note that this operation

is only possible when the current configuration is saved, in order to avoid the possibility of changing the source repository.

• Unload Package - this is equivalent to using the Build->Packages menu item to select and unload the package in question.

Conflicts Window

This window exists to display any configuration item conflicts. Conflicts are the result of failures to meet the requirements between configuration items expressed in the CDL. See

the section called Conflicts in Chapter

The window comprises three columns:

Chapter 18. Screen Layout

• Item

This is the macro name of the first item involved in the conflict.

• Conflict

This is a description of the conflict type. The currently supported types are “unresolved”, “illegal value”,

“evaluation exception”, “goal unsatisfied” and “bad data”.

• Property

This contains a description of the configuration item’s property that caused the conflict.

Within the conflicts window you can right-click on any item to display a context menu which allows you to choose from one of the following options:

To locate the item involved in the conflict, double-click in the first or third column, or right-click over the item and choose Locate from the popup menu.

You can use the Tools->Resolve Conflicts menu item, or right-click over the item and select Resolve from the popup menu, to resolve conflicts —

the section called Resolving conflicts in Chapter 19

Output Window

This window displays any output generated by execution of external tools and any error messages that are not suitable for display in other forms (for example, as message boxes).

Within the output window you can right-click to display a context menu which allows you to:

• Save the contents of the window to a file

• Clear the contents of the window

Properties Window

This window displays the CDL properties of the item currently selected in the configuration window. The same information may be displayed by right-clicking the item and selecting “properties”.

Two properties may be double-clicked as follows:

Chapter 18. Screen Layout

• URL – double-clicking on a URL property causes the referenced HTML page to be displayed. This has the same effect as right-clicking on the item and choosing “Visit Documentation”.

• File – double-clicking on a File property in a saved configuration causes the File to be displayed. The viewer used for this purpose may be changed using the View->Settings menu item. Note that this operation is only possible when the current configuration is saved, in order to avoid the possibility of changing the source repository.

Short Description Window

This window displays a short description of the item currently selected in the configuration window. More extensive documentation may be available by right-clicking on the item and choosing “Visit Documentation”.

Chapter 19. Updating the Configuration

Adding and Removing Packages

To add or remove packages from the configuration, select Build->Packages. The following dialog box will be displayed:

Figure 19-1. Packages dialog box

The left-hand list shows those packages that are available to be loaded. The right-hand list shows those that are currently loaded. In order to transfer packages from one list to another (that is, to load or unload packages) double-click the selection or click the Add or Remove buttons.

The version drop-down list displays the versions of the selected packages. When loading packages, this control may be used to load versions other than the most recent (current). Note that if more than one package is selected, the version drop-down list will display only the versions common to all the selected packages.

The window under the version displays a brief description of the selected package. If more than one package is selected, this window will be blank.

Under the description window there is a Keywords control into which you can type a string to be matched against package names, macro names and descriptions. The lists are updated a second or so after typing has stopped. If you type several separate words, all of these words must be associated with a given package for that package to be displayed. If you select the Match exactly checkbox, then the string is taken to be a complete fragment and matched against the beginning of a name, macro name or descriptions. All matches are done case-insensitively.

If you check Omit hardware packages, only non-hardware packages will be shown.

Chapter 19. Updating the Configuration

Platform Selection

To add, modify or remove entries in the list of platforms used for running tests, select Tools->Platforms. The following dialog will be displayed:

Figure 19-2. Platforms dialog box

You may add, modify or remove platform entries as you wish, but in order to run tests, a platform must be defined to correspond to the currently loaded hardware template. The information associated with each platform name is used to run tests.

To modify a platform, click the Modify button with the appropriate platform selected, or double-click on an entry in the list. A dialog will be displayed that allows you to change the command prefix, platform type and arguments for GDB.

Figure 19-3. Platform Modify dialog box

Chapter 19. Updating the Configuration

To add a new platform, click the Add button. A similar dialog will be displayed that allows you to define a new platform. To remove a platform, click the Delete button or press the DEL key with the appropriate platform selected.

The command prefix is used when running tests in order to determine the names of the executables (such as gdb) to be used. For example, if the gdb executable name is “arm-elf-gdb.exe” the prefix should be set to

“arm-elf”.

The platform type indicates the capabilities of the platform - whether it is hardware or a simulator, and whether breakpoints are supported.

The arguments for the GDB field allow additional arguments to be passed to gdb when it is used to run a test.

This is typically used in the case of simulators linked to gdb in order to define memory layout.

Using Templates

To load a configuration based on a template, select Build->Templates.

The following dialog box will be displayed:

Figure 19-4. Templates dialog box

Change the hardware template, the packages template, or both. To select a hardware template, choose from the first drop-list. To choose a packages template, choose from the second. Brief descriptions of each kind of template are provided in the corresponding edit boxes.

Resolving conflicts

During the process of configuring eCos it is possible that conflicts will be created. For more details of the meaning of conflicts, see

Chapter 24 .

Chapter 19. Updating the Configuration

The Conflicts Window displays all conflicts in the current configuration. Additionally, a window in the status bar displays a count of the conflicts. Because the resolution of conflicts can be time-consuming, a mechanism exists whereby conflicts can be resolved automatically.

You can choose to have a conflicts resolution dialog box displayed by means of the View->Settings... menu item, on the Conflict Resolution tab of the dialog.

Figure 19-5. Options

You can choose to have conflicts checked under the following circumstances:

• After any item is changed (in other words, as soon as the conflict is created)

• Before saving the configuration (including building)

• Never

The method you chose depends on how much you need your configuration to be free of conflicts. You may want to avoid having to clean up all the conflicts at once, or you may want to keep the configuration consistent at all times. If you have major changes to implement, which may resolve the conflicts, then you might want to wait until after you have completed these changes before you check for conflicts.

Note: If you choose to check conflicts after any item is changed, only newly arising conflicts are displayed.

If you choose to check for conflicts before saving the configuration, the complete set is displayed.

Automatic resolution

If you check the “Automatically suggest fixes” check box, a conflicts resolution dialog box will be displayed whenever new conflicts are created. The same dialog box may be displayed at any stage by means of the

Tools->Resolve Conflicts menu item.

The conflicts resolution dialog box contains two major windows.

Figure 19-6. Resolve conflicts window

Chapter 19. Updating the Configuration

The upper contains the set of conflicts to be addressed; the format of the data being as that of the Conflicts

Window. The lower window contains a set of proposed resolutions – each entry is a suggested configuration item value change that as a whole may be expected to lead to the currently selected conflict being resolved.

Note that there is no guarantee:

• that automatic resolutions will be determinable for every conflict.

• that the resolutions for separate conflicts will be independent. In other words, the resolution of one conflict may serve to prevent the resolution of another.

• that the resolution conflicts will not create further conflicts.

The above warnings are, however, conservative. In practice (so long as the number and extent of conflicts are limited) automatic conflict resolution may be used to good effect to correct problems without undue amounts of programmer intervention.

In order to select the conflicts to be applied, select or clear the check boxes against the resolutions for each proposed resolution. By default all resolutions are selected; you can return to the default state (in other words, cause all check boxes for each conflict to again become checked) by pressing the “Reset” button. Note that multiple selection may be used in the resolutions control to allow ranges of check boxes to be toggled in one gesture.

When you are happy to apply the selected resolutions for each conflict displayed, click Apply; this will apply the resolutions. Alternatively you may cancel from the dialog box without any resolutions being applied.

Chapter 20. Searching

Select Edit --> Find. You will be presented with a Find dialog box:

Figure 20-1. Find dialog box

Using this dialog box you can search for an exact text string in any one of three ways, as specified by your selection in the “Search in” drop-list:

• Macro names - the search is for a text match within configuration item macro names

• Item names - the search is for a text match within configuration item descriptive names

Short descriptions - the search is for a text match within configuration item short descriptions •

Note that to invoke Find you can also click the Find icon on the toolbar.

Chapter 21. Building

When you have configured eCos, you may build the configuration.

On the Build menu, click:

• Library (or click the Build Library icon on the toolbar) – this causes the eCos configuration to be built. The result of a successful build will be (among other things) a library against which user code can be linked

• Tests – this causes the eCos configuration to be built, and additionally builds the relevant test cases linked against the eCos library

•

Clean – this removes all intermediate files, thus causing a subsequent build/library or build/tests operation to cause recompilation of all relevant files.

• Stop – this causes a currently executing build (any of the above steps) to be interrupted

Build options may be displayed by using the Build->Options menu item. This displays a dialog box containing a drop-list control and two windows. The drop-list control allows you to select the type of build option to be displayed (for example “LDFLAGS” are the options applied at link-time. The left-hand window is a tree view of the packages loaded in the current configuration. The right-hand window is a list of the build options that will be used for the currently selected package.

Note that this dialog box currently affords only read-only access to the build options. In order to change build options you must edit the relevant string configuration item.

A single level of inheritance is supported: each package’s build options are combined with the global options

(these are to be found in the “Global build options” folder in the configuration view).

Selecting Build Tools

Normally the installation process will supply the information required for the eCosConfiguration Tool to locate the build tools (compiler, linker, etc.) necessary to perform a build. However if this information is not registered, or it is necessary to specify the location manually (for example, when a new toolchain installation has been made), select Tools->Paths->Build Tools. The following dialog box will be displayed:

Chapter 21. Building

Figure 21-1. Build tools

This dialog box allows you to locate the folder containing the build tools.

Selecting User Tools

Normally the installation process will supply the information required for the eCosConfiguration Tool to locate the user tools (cat, ls, etc.) necessary to perform a build. However if this information is not registered, or it is necessary to specify the location manually (for example, when a new toolchain installation has been made), select Tools->Paths->User Tools. The following dialog box will be displayed:

Figure 21-2. User tools

Chapter 22. Execution

Test executables that have been linked using the Build/Tests operation against the current configuration can be executed by selecting Tools->Run Tests.

When tests are run, the Configuration Tool looks for a platform name corresponding to the currently loaded hardware template. If no such platform is found, a dialog will be displayed for you to define one; this dialog is similar to that displayed by the Add function in the Tools->Platforms dialog, but in this case the platform name cannot be changed.

When a test run is invoked, a property sheet is displayed, comprising three tabs: Executables, Output and

Summary.

Note that the property sheet is resizable.

Three buttons appear on the property sheet itself: Run/Stop, Close and Properties.

The Run button is used to initiate a test run. Those tests selected on the Executables tab are run, and the output recorded on the Output and Summary tabs. During the course of a run, the Run button changes to “Stop”. The button may be used to interrupt a test run at any point.

Properties

The Properties button is used to change the connectivity properties for the test run.

Figure 22-1. Properties dialog box

Download Timeout

This group of controls serves to set the maximum time that is allowed for downloading a test to the target board. If the time is exceeded, the test will be deemed to have failed for reason of “Download Timeout” and the execution of that particular test will be abandoned. This option only applies to tests run on hardware, not to those executed in a simulator. Times are in units of elapsed seconds.

Chapter 22. Execution

Three options are available using the drop-down list:

•

• Calculated from file size - an estimate of the maximum time required for download is made using the

(stripped) executable size and the currently used baud rate

Specified - a user-specified value may be entered in the adjacent edit box

None - no maximum download time is to be applied.

Run time Timeout

This group of controls serves to set the maximum time that is allowed for executing a test on the target board or in a simulator. If the time is exceeded, the test will be deemed to have failed for reason of “Timeout” and the execution of that particular test will be abandoned. In the case of hardware, the time is measured in elapsed seconds: in the case of a simulator it is in CPU seconds.

Three options are available using the drop-down list:

• None - no maximum download time is to be applied.

• Specified - a user-specified value may be entered in the adjacent edit box

• Default - a default value of 30 seconds is used

Connection

The Connection controls may be used to specify how the target board is to be accessed.

If the target board is connected using a serial cable, the Serial radio button should be checked. In this case you can select a port (COM1, COM2, . . . ) and an appropriate baud rate using drop-list boxes.

If the target board is accessed remotely using GDB remote protocol, the “TCP/IP” radio button should be checked. In this case you can select a host name and TCP/IP port number using edit boxes.

Executables Tab

This is used to adjust the set of tests available for execution. A check box against each executable name indicates whether that executable will be included when the Run button is pressed. The Check All and Uncheck

All buttons may be used to check or uncheck all items.

When the property sheet is first displayed, it will be pre-populated with those test executables that have been linked using the Build/Tests operation against the current configuration.

Figure 22-2. Run tests

Chapter 22. Execution

You can right-click in the window to display a context menu containing Add and Remove items. Clicking

Remove will remove those executables selected. Clicking Add will display a dialog box that allows you to add to the set of items. Equivalently the Add button may be used to add executables, and the DEL key may be used to remove them.

You can use the Add from Folder button to add a number of executables in a specified folder (optionally including subfolders, if you click on Yes when asked).

Figure 22-3. Add files from folder

Output Tab

This tab is used to display the output from running tests. The output can be saved to a file or cleared by means

Chapter 22. Execution of the popup menu displayed when you right-click in the window.

Summary Tab

This tab is used to display a record, in summary form, of those tests executed. For each execution, the following information is displayed:

•

Time - the date and time of execution

Host - the host name of the machine from which the test was downloaded

•

Platform - the platform on which the test was executed

Executable - the executable (file name) of the test executed

Status - the result of executing the test. This will be one of the following: •

• Not started

• No result

•

• Inapplicable

Pass

• DTimeout

• Timeout

•

• Cancelled

Fail

•

• Assert fail

Size - the size [stripped/unstripped] of the test executed

• Download - the download time [mm:ss/mm:ss] used. The first of the two times displayed represents the actual time used: the second the limit time.

• Elapsed - the elapsed time [mm:ss] used.

• Execution - the execution time [mm:ss/mm:ss] used. The first of the two times displayed represents the actual time used: the second the limit time.

The output can be saved to a file or cleared by means of the popup menu displayed when you right-click in the window.

Chapter 23. Creating a Shell

To call up a shell window, select Tools->Shell. Under Windows, you will get a Cygwin shell similar to the one below. On Linux, you will get a standard Linux shell window.

Keyboard Accelerators

The following table presents the list of keyboard accelerators that can be used with the Configuration Tool.

Table 23-1. Keyboard accelerators

Accelerator

Alt+1

Alt+2

Alt+3

Alt+4

Ctrl+A

Ctrl+C

Ctrl+F

Ctrl+N

Ctrl+O

Ctrl+S

Ctrl+V

Ctrl+X

Ctrl+Z

Shift+F7

Alt+F6

Action hide/show properties window hide/show output window hide/show short description window hide/show conflicts window select all copy

Edit->Find

File->New

File->Open

File->Save

Paste

Cut

Undo

Context-sensitive help

Find next

Build->Library

Build->Tests

View->Next window

Remarks output window and in-cell editing output window and in-cell editing in-cell editing only in-cell-editing only in-cell editing only

Accelerator

Shift+Alt+0

Shift+Ins

Shift+F10

Alt+Enter

Space

Chapter 23. Creating a Shell

Action

View->Previous window

Paste

Display context menu

Display properties dialog box

Increment item value

Decrement item value

Toggle item value

Remarks in-cell editing only

Configuration window

V. eCos Programming Concepts and

Techniques

Programming with eCos is somewhat different from programming in more traditional environments. eCos is a configurable open source system, and you are able to configure and build a system specifically to meet the needs of your application.

Various different directory hierarchies are involved in configuring and building the system: the component

repository, the build tree, and the install tree. These directories exist in addition to the ones used to develop applications.

Chapter 24. CDL Concepts

About this chapter

This chapter serves as a brief introduction to the concepts involved in eCos (Embedded Configurable Operating

System). It describes the configuration architecture and the underlying technology to a level required for the embedded systems developer to configure eCos. It does not describe in detail aspects such as how to write reusable components for eCos: this information is given in the Component Writer’s Guide.

Background

Software solutions for the embedded space place particularly stringent demands on the developer, typically represented as requirements for small memory footprint, high performance and robustness. These demands are addressed in eCos by providing the ability to perform compile-time specialization: the developer can tailor the operating system to suit the needs of the application. In order to make this process manageable, eCos is built in the context of a Configuration Infrastructure: a set of tools including a Configuration Tool and a formal description of the process of configuration by means of a Component Definition Language.

Configurations

eCos is tailored at source level (that is, before compilation or assembly) in order to create an eCos configura-

tion. In concrete terms, an eCos configuration takes the form of a configuration save file (with extension .ecc) and set of files used to build user applications (including, when built, a library file against which the application is linked).

Component Repository

eCos is shipped in source in the form of a component repository - a directory hierarchy that contains the sources and other files which are used to build a configuration. The component repository can be added to by, for example, downloading from the net.

Component Definition Language

Part of the component repository is a set of files containing a definition of its structure. The form used for this purpose is the Component Definition Language (CDL). CDL defines the relationships between components and other information used by tools such as the eCosConfiguration Tool. CDL is generally formulated by the writers of components: it is not necessary to write or understand CDL in order for the embedded systems developer to construct an eCos configuration.

Chapter 24. CDL Concepts

Packages

The building blocks of an eCos configuration are called packages. Packages are the units of software distribution. A set of core packages (such as kernel, C library and math library) is provided by Red Hat: additional third-party packages will be available in future.

A package may exist in one of a number of versions. The default version is the current version. Only one version of a given package may be present in the component repository at any given time.

Packages are organized in a tree hierarchy. Each package is either at the top-level or is the child of another package.

The eCos Package Administration Tool can be used to add or remove packages from the component repository.

The eCos Configuration Tool can be used to include or exclude packages from the configuration being built.

Configuration Items

Configuration items are the individual entities that form a configuration. Each item corresponds to the setting of a C pre-processor macro (for example,

CYGHWR_HAL_ARM_PID_GDB_BAUD

). The code of eCos itself is written to test such pre-processor macros so as to tailor the code. User code can do likewise.

Configuration items come in the following flavors:

• None: such entities serve only as place holders in the hierarchy, allowing other entities to be grouped more easily.

• Boolean entities are the most common flavor; they correspond to units of functionality that can be either enabled or disabled. If the entity is enabled then there will be a #define; code will check the setting using, for example, #ifdef

• Data entities encapsulate some arbitrary data. Other properties such as a set or range of legal values can be used to constrain the actual values, for example to an integer or floating point value within a certain range.

• Booldata entities combine the attributes of Boolean and Data: they can be enabled or disabled and, if enabled, will hold a data value.

Like packages, configuration items exist in a tree-based hierarchy: each configuration item has a parent which may be another configuration item or a package. Under some conditions (such as when packages are added or removed from a configuration), items may be “re-parented” such that their position in the tree changes.

Expressions

Expressions are relationships between CDL items. There are three types of expression in CDL:

Table 24-1. CDL Expressions

Expression Type

Ordinary

List

Goal

Result

A single value

A range of values (for example “1 to 10”)

True or False

Common Use (see

Table 24-2 )

legal_values property legal_values property requires and active_if properties

Chapter 24. CDL Concepts

Properties

Each configuration item has a set of properties. The following table describes the most commonly used:

Table 24-2. Configuration properties

Property

Flavor

Enabled

Current_value

Default_value

Legal_values

Active_if

Requires

Calculated

Macro

File

URL

Hardware

Use

The “type” of the item, as described above

Whether the item is enabled

The current value of the item

An ordinary expression defining the default value of the item

A list expression defining the values the item may hold (for example, 1 to10)

A goal expression denoting the requirement for this item to be active (see below: Inactive Items)

A goal expression denoting requirements this item places on others (see below: Conflicts)

Whether the item as non-modifiable

The corresponding C pre-processor macro

The C header file in which the macro is defined

The URL of a documentation page describing the item

Indicates that a particular package is related to specific hardware

A complete description of properties is contained in the Component Writer’s Guide.

Inactive Items

Descendants of an item that is disabled are inactive: their values may not be changed. Items may also become

inactive if an active_if expression is used to make the item dependent on an expression involving other items.

Conflicts

Not all settings of configuration items will lead to a coherent configuration; for example, the use of a timeout facility might require the existence of timer support, so if the one is required the other cannot be removed.

Coherence is policed by means of consistency rules (in particular, the goal expressions that appear as CDL items requires and active_if attributes [see above]). A violation of consistency rules creates a conflict, which must be resolved in order to ensure a consistent configuration. Conflict resolution can be performed manually or with the assistance of the eCos tools. Conflicts come in the following flavors:

• An unresolved conflict means that there is a reference to an entity that is not yet in the current configuration

• An illegal value conflict is caused when a configuration item is set to a value that is not permitted (that is, a

legal_values goal expression is failing)

Chapter 24. CDL Concepts

• An evaluation exception conflict is caused when the evaluation of an expression would fail (for example, because of a division by zero)

• An unsatisfied goal conflict is caused by a failing requires goal expression

• A bad data conflict arises only rarely, and corresponds to badly constructed CDL. Such a conflict can only be resolved by reference to the CDL writer.

Templates

A template is a saved configuration - that is, a set of packages and configuration item settings. Templates are provided with eCos to allow you to get started quickly by instantiating (copying) a saved configuration corresponding to one of a number of common scenarios; for example, a basic eCos configuration template is supplied that contains the infrastructure, kernel, C and math libraries, plus their support packages.

Chapter 25. The Component Repository and

Working Directories

Each of the file trees involved in eCos development has a different role.

Component Repository

The eCos component repository contains directories for all the packages that are shipped with eCos or provided by third parties.

The component repository should not be modified as part of application development.

Figure 25-1. Component repository

Chapter 25. The Component Repository and Working Directories

Purpose

The component repository is the master copy of source code for all system and third party components. It also contains some files needed to administer and build the system, such as ecosadmin.tcl.

How is it modified?

You modify it by importing new versions of packages from a distribution or removing existing packages. These activities are undertaken using the eCos Package Administration Tool.

When is it edited manually?

Files in the component repository should only be edited manually as determined by the component maintainer.

User Applications

User application source code should not go into the component repository.

Examples of files in this hierarchy:

BASE_DIR/doc/ref/ecos-ref.html

The top level HTML file for the eCos Reference Manual.

BASE_DIR/prebuilt/pid/tests/kernel/<version>/tests/thread_gdb.exe

BASE_DIR/prebuilt/linux/tests/kernel/<version>/tests/thread_gdb.exe

Pre-built tests for the supported platforms, and the synthetic Linux target.

BASE_DIR/examples/twothreads.c

One of the example programs.

BASE_DIR/ecosadmin.tcl

The Tcl program which is used to import new versions of packages from a distribution or remove existing packages.

BASE_DIR/packages/language/c/libm/<version>/src/double/portable-api/s_tanh.c

Implementation of the hyperbolic tangent function in the standard math library.

BASE_DIR/pkgconf/rules.mak

A file with make rules, used by the makefile .

Chapter 25. The Component Repository and Working Directories

Build Tree

The build tree is the directory hierarchy in which all generated files are placed. Generated files consist of the makefile

, the compiled object files, and a dependency file (with a

extension) for each source file.

Purpose

The build tree is where all intermediate object files are placed.

How is it modified?

Recompiling can modify the object files.

User applications

User application source or binary code should not go in the build tree.

Examples of files in this hierarchy

ecos-work/language/c/libc/<version>/src

The directory in which object files for the C library are built.

Install Tree

The install tree is the location for all files needed for application development. The libtarget.a

library, which contains the custom-built eCos kernel and other components, is placed in the install tree, along with all packages’ public header files. If you build the tests, the test executable programs will also be placed in the install tree.

By default, the install tree is created by ecosconfig in a subdirectory of the build tree called install . This can be modified with the --prefix option (see

Chapter 28

Purpose

The install tree is where the custom-built libtarget.a

library, which contains the eCos kernel and other components, is located. The install tree is also the location for all the header files that are part of a published interface for their component.

How is it modified?

Recompiling can replace libtarget.a

and the test executables.

Chapter 25. The Component Repository and Working Directories

When is it edited manually?

Where a memory layout requires modification without use of the eCos Configuration Tool, the memory layout files must be edited directly in the install tree. These files are located at install/include/pkgconf/mlt_*.*

Note that subsequent modification of the install tree using the Configuration Tool will result in such manual edits being lost.

User applications

User application source or binary code should not go in the install tree.

Examples of files in this hierarchy

install/lib/libtarget.a

The library containing the kernel and other components.

install/include/cyg/kernel/kapi.h

The header file for the kernel C language API.

install/include/pkgconf/mlt_arm_pid_ram.ldi

The linker script fragment describing the memory layout for linking applications intended for execution on an ARM PID development board using RAM startup.

install/include/stdio.h

The C library header file for standard I/O.

Application Build Tree

This tree is not part of eCos itself: it is the directory in which eCos end users write their own applications.

Example applications and their Makefile are located in the component repository, in the directory

BASE_DIR/examples .

There is no imposed format on this directory, but there are certain compiler and linker flags that must be used to compile an eCos application. The basic set of flags is shown in the example Makefile , and additional details can be found in

Chapter 26 .

Chapter 26. Compiler and Linker Options

eCos is built using the GNU C and C++ compilers. eCos relies on certain features of these tools such as constructor priority ordering and selective linking which are not part of other toolchains.

Some GCC options are required for eCos, and others can be useful. This chapter gives a brief description of the required options as well as some recommended eCos-specific options. All other GCC options (described in the GCC manuals) are available.

Compiling a C Application

The following command lines demonstrate the minimum set of options required to compile and link an eCos program written in C.

Note: Remember that when this manual shows TARGETgcc you should use the full name of the cross compiler, e.g. i386-elf-gcc, arm-elf-gcc, or sh-elf-gcc. When compiling for the synthetic Linux target, use the native gcc which must have the features required by eCos.

$ TARGET-gcc -c -IINSTALL_DIR/include file.c

$ TARGET-gcc -o program file.o -LINSTALL_DIR/lib -Ttarget.ld -nostdlib

Note: Certain targets may require extra options, for example the SPARClite architectures require the option

-mcpu=sparclite . Examine the BASE_DIR/examples/Makefile or the “Global compiler flags” option (CYG-

BLD_GLOBAL_CFLAGS) in your generated eCos configuration) to see if any extra options are required, and if so, what they are.

The following command lines use some other options which are recommended because they use the selective linking feature:

$ TARGET-gcc -c -IINSTALL_DIR/include -I. -ffunction-sections -fdata-sections -g -O2 file.c

$ TARGET-gcc -o program file.o -ffunction-sections -fdata-sections -Wl,--gc-sections -g -O2 \

-LINSTALL_DIR/lib -Ttarget.ld -nostdlib

Compiling a C++ Application

The following command lines demonstrate the minimum set of options required to compile and link an eCos program written in C++.

Note: Remember that when this manual shows TARGETg++ you should use the full name of the cross compiler, e.g. i386-elf-g++, arm-elf-g++, or sh-elf-g++. When compiling for the synthetic Linux target, use the native g++ which must have the features required by eCos.

$ TARGET-g++ -c -IINSTALL_DIR/include -fno-rtti -fno-exceptions file.cxx

$ TARGET-g++ -o program file.o -LINSTALL_DIR/lib -Ttarget.ld -nostdlib

Note: Certain targets may require extra options, for example the SPARClite architectures require the option

-mcpu=sparclite

. Examine the

BASE_DIR/packages/targets file or

BASE_DIR/examples/Makefile or the

Chapter 26. Compiler and Linker Options

“Global compiler flags” option (CYGBLD_GLOBAL_CFLAGS) in your generated eCos configuration) to see if any extra options are required, and if so, what they are.

The following command lines use some other options which are recommended because they use the

selective linking feature:

$ TARGET-g++ -c -IINSTALL_DIR/include -I. -ffunction-sections -fdata-sections -fno-rtti \

-fno-exceptions -finit-priority -g -O2 file.cxx

$ TARGET-g++ -o program file.o -W1,--gc-sections -g -O2 -LINSTALL_DIR/lib -Ttarget.ld

-nostdlib

Chapter 27. Debugging Techniques

eCos applications and components can be debugged in traditional ways, with printing statements and debugger single-stepping, but there are situations in which these techniques cannot be used. One example of this is when a program is getting data at a high rate from a real-time source, and cannot be slowed down or interrupted.

eCos’s infrastructure module provides a tracing formalism, allowing the kernel’s tracing macros to be configured in many useful ways. eCos’s kernel provides instrumentation buffers which also collect specific (configurable) data about the system’s history and performance.

Tracing

To use eCos’s tracing facilities you must first configure your system to use tracing. You should enable the Asserts and Tracing component (

CYGPKG_INFRA_DEBUG

) and the

Use tracing component within it

( CYGDBG_USE_TRACING ). These options can be enabled with the Configuration Tool or by editing the file

BUILD_DIR/pkgconf/infra.h

manually.

You should then examine all the tracing-related options in the Package: Infrastructure chapter of the eCos

Reference Manual. One useful set of configuration options are: CYGDBG_INFRA_DEBUG_FUNCTION_REPORTS and CYGDBG_INFRA_DEBUG_TRACE_MESSAGE , which are both enabled by default when tracing is enabled.

The following “Hello world with tracing” shows the output from running the hello world program (from

the section called eCos Hello World in Chapter 13 ) that was built with tracing enabled:

Example 27-1. Hello world with tracing

$ mips-tx39-elf-run --board=jmr3904 hello

Hello, eCos world!

[ 623] Cyg_TraceFunction_Report_::set_exitvoid() ASSERT FAIL: < 2 > cyg_trac.h

TRACE: < 1 > mlqueue.cxx

TRACE: < 1 > thread.cxx

[ 395] Cyg_ThreadQueue_Implementation::enqueue()

[ 126] Cyg_Scheduler_Implementation::add_thread()

[ 654] Cyg_Thread::resume()

[ 160] cyg_iso_c_start() TRACE: < 1 > cstartup.cxx

TRACE: < 1 > startup.cxx

TRACE: < 1 > sched.cxx

[ 142] cyg_package_start()

[ 150] cyg_user_start()

[ 153] cyg_user_start()

[ 157] cyg_user_start()

[ 212] Cyg_Scheduler::start()

[ 102] Cyg_Scheduler_Implementation::schedule()

[ 437] Cyg_ThreadQueue_Implementation::highpri()

TRACE: < 1 > mlqueue.cxx

TRACE: < 2 > intr.cxx

TRACE: < 2 > thread.cxx

TRACE: < 2 > cstartup.cxx

TRACE: < 2 > dummyxxmain.cxx

[ 437] Cyg_ThreadQueue_Implementation::highpri()

[ 102] Cyg_Scheduler_Implementation::schedule()

[ 450] Cyg_Interrupt::enable_interrupts()

[ 69] Cyg_HardwareThread::thread_entry()

[ 127] invoke_main()

[

60] __main()

TRACE:

> dummyxxmain.cxx

memcpy.c

TRACE: < 2 > memcpy.c

TRACE: < 2 > cstartup.cxx

[ 63] __main()

[ 67] __main()

[ 112] _memcpy()

[ 164] _memcpy()

[ 137] invoke_main()

77 exitvoid used in typed function

{{enter

}}RETURNING UNSET!

}}return void

{{enter

(((void)))

’This is the system default cyg_user_start()’

}}return void

{{enter

}}RETURNING UNSET!

{{enter

}}RETURNING UNSET!

{{enter

((argument is ignored))

{{enter

(((void)))

’This is the system default __main()’

}}return void

{{enter

((dst=80002804, src=BFC14E58, n=19))

}}returning 80002804

’main() has returned with code 0. Calling exit()’

Chapter 27. Debugging Techniques

TRACE: < 2 > exit.cxx

TRACE: < 2 > atexit.cxx

Scheduler:

Lock:

Current Thread:

Threads:

< null >

[ 71] __libc_exit()

[ 84] cyg_libc_invoke_atexit_handlers()

Idle Thread

< null > pri = 31 state = R id = 1 stack base = 800021F0 ptr = 80002510 size = 00000400 sleep reason NONE queue = 80000C54 wake reason NONE wait info = 00000000 pri = 0 state = R id = 2 stack base = 80002A48 ptr = 8000A968 size = 00008000 sleep reason NONE wake reason NONE queue = 80000BD8 wait info = 00000000

Kernel Instrumentation

Instrument buffers can be used to find out how many events of a given type happened in the kernel during execution of a program.

You can monitor a class of several types of events, or you can just look at individual events.

Examples of events that can be monitored are:

• scheduler events

• thread operations

• interrupts

• mutex operations

• binary semaphore operations

• counting semaphore operations

• clock ticks and interrupts

Examples of fine-grained scheduler event types are:

• scheduler lock

• scheduler unlock

• rescheduling

• time slicing

Information about the events is stored in an event record. The structure that defines this record has type struct

Instrument_Record:

The list of records is stored in an array called instrument_buffer which you can let the kernel provide or you can provide yourself by setting the configuration option

CYGVAR_KERNEL_INSTRUMENT_EXTERNAL_BUFFER

{{enter

((status=0 ))

{{enter

(((void)))

Chapter 27. Debugging Techniques

To write a program that examines the instrumentation buffers:

1. Enable instrumentation buffers in the eCos kernel configuration. The component macro is

CYGPKG_KERNEL_INSTRUMENT .

2. To allocate the buffers yourself,

CYGVAR_KERNEL_INSTRUMENT_EXTERNAL_BUFFER

enable the configuration option

3. Include the header file cyg/kernel/instrmnt.h

#include < cyg/kernel/instrmnt.h

4. The Instrumentation_Record structure is not published in the kernel header file. In the future there will be a cleaner mechanism to access it, but for now you should paste into your code in the following lines: struct Instrument_Record

{

CYG_WORD16 type; // record type

CYG_WORD16 thread; // current thread id

CYG_WORD timestamp; // 32 bit timestamp

CYG_WORD arg1; // first arg

CYG_WORD arg2; // second arg

};

5. Enable the events you want to record using cyg_instrument_enable() , and disable them later. Look at cyg/kernel/instrmnt.h

and the examples below to see what events can be enabled.

6. Place the code you want to debug between the matching functions cyg_instrument_enable() and cyg_instrument_disable()

7. Examine the buffer. For now you need to look at the data in there (the example program below shows how to do that), and future versions of eCos will include a host-side tool to help you understand the data.

Example 27-2. Using instrument buffers

This program is also provided in the examples directory.

/* this is a program which uses eCos instrumentation buffers; it needs to be linked with a kernel which was compiled with support for instrumentation */

#include < stdio.h

#include < pkgconf/kernel.h

#include < cyg/kernel/instrmnt.h

#include < cyg/kernel/kapi.h

#ifndef CYGVAR_KERNEL_INSTRUMENT_EXTERNAL_BUFFER

# error You must configure eCos with CYGVAR_KERNEL_INSTRUMENT_EXTERNAL_BUFFER

#endif struct Instrument_Record

{

CYG_WORD16 type; // record type

CYG_WORD16 thread; // current thread id

CYG_WORD timestamp; // 32 bit timestamp

CYG_WORD arg1; // first arg

CYG_WORD arg2; // second arg

}; struct Instrument_Record instrument_buffer[20]; cyg_uint32 instrument_buffer_size = 20;

Chapter 27. Debugging Techniques int main(void)

{ int i; cyg_instrument_enable(CYG_INSTRUMENT_CLASS_CLOCK, 0); cyg_instrument_enable(CYG_INSTRUMENT_CLASS_THREAD, 0); cyg_instrument_enable(CYG_INSTRUMENT_CLASS_ALARM, 0); printf("Program to play with instrumentation buffer\n"); cyg_thread_delay(2); cyg_instrument_disable(CYG_INSTRUMENT_CLASS_CLOCK, 0); cyg_instrument_disable(CYG_INSTRUMENT_CLASS_THREAD, 0); cyg_instrument_disable(CYG_INSTRUMENT_CLASS_ALARM, 0); for (i = 0; i < instrument_buffer_size; ++i) { printf("Record %02d: type 0x%04x, thread %d, ", i, instrument_buffer[i].type, instrument_buffer[i].thread); printf("time %5d, arg1 0x%08x, arg2 0x%08x\n", instrument_buffer[i].timestamp, instrument_buffer[i].arg1, instrument_buffer[i].arg2);

}

} return 0;

Here is how you could compile and run this program in the examples directory, using (for example) the

MN10300 simulator target:

$ make XCC=mn10300-elf-gcc INSTALL_DIR=/tmp/ecos-work-mn10300/install instrument-test mn10300-elf-gcc -c -o instrument-test.o -g -Wall -I/tmp/ecos-work-mn10300/install/include \

-ffunction-sections -fdata-sections instrument-test.c

mn10300-elf-gcc -nostartfiles -L/tmp/ecos-work-mn10300/install/lib -W1,--gc-sections -o \ instrument-test instrument-test.o -Ttarget.ld -nostdlib

$ mn10300-elf-run --board=stdeval1 instrument-test

Example 27-3. Instrument buffer output

Here is the output of the instrument-test program. Notice that in little over 2 seconds, and with very little activity, and with few event types enabled, it gathered 17 records. In larger programs it will be necessary to select very few event types for debugging.

Program to play with instrumentation buffer

Record 00: type 0x0207, thread 2, time 6057, arg1 0x48001cd8, arg2 0x00000002

Record 01: type 0x0202, thread 2, time 6153, arg1 0x48001cd8, arg2 0x00000000

Record 02: type 0x0904, thread 2, time 6358, arg1 0x48001d24, arg2 0x00000000

Record 03: type 0x0905, thread 2, time 6424, arg1 0x00000002, arg2 0x00000000

Record 04: type 0x0906, thread 2, time 6490, arg1 0x00000000, arg2 0x00000000

Record 05: type 0x0901, thread 2, time 6608, arg1 0x48009d74, arg2 0x48001d24

Record 06: type 0x0201, thread 2, time 6804, arg1 0x48001cd8, arg2 0x480013e0

Record 07: type 0x0803, thread 1, time

Record 08: type 0x0801, thread 1, time

Record 09: type 0x0802, thread 1, time

94, arg1 0x00000000, arg2 0x00000000

361, arg1 0x00000000, arg2 0x00000000

548, arg1 0x00000001, arg2 0x00000000

Record 10: type 0x0803, thread 1, time

Record 11: type 0x0801, thread 1, time

Record 12: type 0x0903, thread 1, time

Record 13: type 0x0208, thread 1, time

Record 14: type 0x0203, thread 1, time

Record 15: type 0x0802, thread 1, time

94, arg1 0x00000000, arg2 0x00000000

361, arg1 0x00000001, arg2 0x00000000

513, arg1 0x48009d74, arg2 0x48001d24

588, arg1 0x00000000, arg2 0x00000000

697, arg1 0x48001cd8, arg2 0x480013e0

946, arg1 0x00000002, arg2 0x00000000

Chapter 27. Debugging Techniques

Record 16: type 0x0201, thread 1, time 1083, arg1 0x480013e0, arg2 0x48001cd8

Record 17: type 0x0000, thread 0, time 0, arg1 0x00000000, arg2 0x00000000

Record 18: type 0x0000, thread 0, time

Record 19: type 0x0000, thread 0, time

0, arg1 0x00000000, arg2 0x00000000

VI. Configuration and the Package

Repository

The following chapters contain information on running ecosconfig (the command line tool that manipulates configurations and constructs build trees) and on managing a source repository across multiple versions of eCos.

Chapter 28. Manual Configuration

eCos developers will generally use the graphical Configuration Tool for configuring an eCos system and building the target library. However, some user prefer to use command line tools. These command line tools can also be used for batch operations on all platforms, for example as part of a nightly rebuild and testing procedure.

In the current release of the system the command line tools do not provide exactly the same functionality as the graphical tool. Most importantly, there is no facility to resolve configuration conflicts interactively.

The eCos configuration system, both graphical and command line tools, are under constant development and enhancement. Developers should note that the procedures described may change considerably in future releases.

Directory Tree Structure

When building eCos there are three main directory trees to consider: the source tree, the build tree, and the install tree.

The source tree, also known as the component repository, is read-only. It is possible to use a single component repository for any number of different configurations, and it is also possible to share a component repository between multiple users by putting it on a network drive.

The build tree contains everything that is specific to a particular configuration, including header and other files that contain configuration data, and the object files that result from compiling the system sources for this configuration.

The install tree is usually located in the install subdirectory of the build tree. Once an eCos system has been built, the install tree contains all the files needed for application development including the header files and the target library. By making copies of the install tree after a build it is possible to separate application development and system configuration, which may be desirable for some organizations.

Creating the Build Tree

Generating a build tree is a non-trivial operation and should not be attempted manually. Instead, eCos is shipped with a tool called ecosconfig that should be used to create a build tree.

Usually ecosconfig will be run inside the build tree itself. If you are creating a new build tree then typically you will create a new empty directory using the mkdir command, cd into that directory, and then invoke

ecosconfig to create a configuration. By default, the configuration is stored in a file ecos.ecc

in the current directory. The configuration may be modified by editing this file directly. ecosconfig itself deals with a number of coarse-grained configuration options such as the target platform and the packages that should be used.

The ecosconfig tool is also used subsequently to generate a build tree for a configuration. Once a build tree exists, it is possible to run ecosconfig again inside the same build tree. This will be necessary if your wish to change some of the configuration options.

ecosconfig does not generate the top-level directory of the build tree; you must do this yourself.

$ mkdir ecos-work

$ cd ecos-work

Chapter 28. Manual Configuration

The next step is to run ecosconfig:

$ ecosconfig < qualifiers > < command >

ecosconfig qualifiers

The available command line qualifiers for ecosconfig are as follows. Multiple qualifiers may be used on the command line:

--help

Provides basic usage guidelines for the available commands and qualifiers.

--config= < file >

Specifies an eCos configuration save file for use by the tool. By default, the file ecos.ecc

in the current directory is used. Developers may prefer to use a common location for all their eCos configurations rather than keep the configuration information in the base of the build tree.

--prefix= < dir >

Specifies an alternative location for the install tree. By default, the install tree resides inside the install directory in the build tree. Developers may prefer to locate the build tree in a temporary file hierarchy but keep the install tree in a more permanent location.

--srcdir= < dir >

Specifies the location of the component repository. By default, the tool uses the location specified in the

ECOS_REPOSITORY environment variable. Developers may prefer to use of this qualifier if they are working with more than one repository.

--no-resolve

Disables the implicit resolution of conflicts while manipulating the configuration data. developers may prefer to resolve conflicts by editing the eCos configuration save file manually.

--ignore-errors

-i

By default, ecosconfig will exit with an error code if the current configuration contains any conflicts, and it is not possible to generate or update a build tree for such configurations. This qualifier causes ecosconfig to ignore such problems, and hence it is possible to generate a build tree even if there are still conflicts.

Of course, there are no guarantees that the resulting system will actually do anything.

--verbose

-v

Display more information.

--quiet

-q

Display less information.

The --config , --prefix and --srcdir qualifiers can also be written with two arguments, for example: ecosconfig --srcdir < dir > ...

This simplifies filename completion with some shells.

Chapter 28. Manual Configuration

ecosconfig commands

The available commands for ecosconfig are as follows: list

Lists the available packages, targets and templates as installed in the eCos repository. Aliases and package versions are also reported.

new <target> [<template> [<version>]]

Creates a new eCos configuration for the specified target hardware and saves it. A software template may also be specified. By default, the template named ‘default’ is used. If the template version is not specified, the latest version is used.

target <target>

Changes the target hardware selection for the eCos configuration. This has the effect of unloading packages supporting the target selected previously and loading the packages which support the new hardware.

This command will be used typically when switching between a simulator and real hardware.

template <template> [<version>]

Changes the template selection for the eCos configuration. This has the effect of unloading packages specified by the template selected previously and loading the packages specified by the new template. By default, the latest version of the specified template is used.

remove <packages>

Removes the specified packages from the eCos configuration. This command will be used typically when the template on which a configuration is based contains packages which are not required.

add <packages>

Adds the specified packages to the eCos configuration. This command will be used typically when the template on which a configuration is based does not contain all the packages which are required.For

example, add-on packages provided by third parties will not be known to the standard templates, so they will have to be added explicitly.

version <version> <packages>

Selects the specified version of a number of packages in the eCos configuration. By default, the most recent version of each package is used. This command will be used typically when an older version of a package is required.

check

Presents the following information concerning the current configuration:

1. the selected target hardware

2. the selected template

3. additional packages

4. removed packages

5. the selected version of packages where this is not the most recent version

6. conflicts in the current configuration

Chapter 28. Manual Configuration resolve

Resolves conflicts identified in the current eCos configuration by invoking an inference capability. Resolved conflicts are reported, but not all conflicts may be resolvable. This command will be used typically following manual editing of the configuration.

export <file>

Exports a minimal eCos configuration save file with the specified name. This file contains only those options which do not have their default value. Such files are used typically to transfer option values from one configuration to another.

import <file>

Imports a minimal eCos configuration save file with the specified name. The values of those options specified in the file are applied to the current configuration.

tree

Generates a build tree based on the current eCos configuration. This command will be used typically just before building eCos.Normally a build tree can only be generated if if the configuration has no unresolved conflicts, but --ignore-errors can be used to override this.

Conflicts and constraints

Configuration options are not completely independent. For example the C library’s strtod() and atof() functions rely on the math library package to provide certain functionality. If the math library package is removed then the C library can no longer provide these functions. Each package describes constraints like these in CDL "requires" properties. If a constraint is not satisfied, then the configuration contains a conflict.

For any given conflict there can be several resolution options. For example, it would be possible to add the math library package back to the configuration, or to disable the strtod() and atof() functions.

The eCos configuration tools will report any conflicts in the current configuration. If there are any such conflicts then the configuration is usually unsafe and it makes no sense to build and run eCos in such circumstances. In fact, any attempt at building eCos is likely to fail. In exceptional cases it is possible to override this by using e.g. the

--ignore-errors qualifier with ecosconfig.

Many constraints are fairly simple in nature, and the configuration tools contain an inference engine which can resolve the associated conflicts automatically. For example, if the math library package is removed then the inference engine can resolve the resulting conflict by disabling the configuration option for strtod() and atof() . All such changes will be reported. Sometimes the inference engine cannot resolve a conflict, for example it is not allowed to override a change that has been made explicitly by the user. Sometimes it will find a solution which does not match the application’s requirements.

A typical session involving conflicts would look something like this:

$ ecosconfig new pid

This creates a new configuration with the default template. For most targets this will not result in any conflicts, because the default settings for the various options meet the requirements of the default template.

For some targets there may be conflicts and the inference engine would come into play.

$ ecosconfig remove libm

U CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT, new inferred value 0

U CYGFUN_LIBC_strtod, new inferred value 0

Chapter 28. Manual Configuration

U CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT, new inferred value 0 ecosconfig reports that this change caused three conflicts, all in the C library. The inference engine was able to resolve all the conflicts and update the relevant configuration options accordingly.

To suppress the inference engine --no-resolve can be used:

$ ecosconfig new pid

$ ecosconfig --no-resolve remove libm

C CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT, "requires" constraint not satisfied:

C CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT, "requires" constraint not satisfied:

C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM

CYGPKG_LIBM

Three unresolved conflicts are reported.

The check command can be used to get the current state of the configuration, and the

--verbose qualifier will provide additional information:

$ ecosconfig --srcdir /home/bartv/ecc/ecc --verbose check

Target: pid

Template: default

Removed:

CYGPKG_LIBM

3 conflict(s):

C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM

Possible solution:

CYGFUN_LIBC_strtod -> 0

CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT -> 0

C CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT, "requires" constraint not satisfied:

Possible solution:

CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT -> 0

C CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT, "requires" constraint not satisfied:

Possible solution:

CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT -> 0

CYGPKG_LIBM

If the proposed solutions are acceptable, the resolve command can be used to apply them:

$ ecosconfig resolve

U CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT, new inferred value 0

U CYGFUN_LIBC_strtod, new inferred value 0

U CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT, new inferred value 0

The current configuration is again conflict-free and it is possible to generate a build tree. The --quiet qualifier can be used to suppress the change messages, if desired.

When changing individual configuration options by editing the ecos.ecc file (as described below), the resulting system should be checked and any problems should be resolved. For example, if CYGFUN_LIBC_strtod is explicitly enabled in the savefile:

$ edit ecos.ecc

$ ecosconfig check

Target: pid

Template: default

Removed:

CYGPKG_LIBM

1 conflict(s):

C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM

$ ecosconfig resolve

C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM

Chapter 28. Manual Configuration

In this case the inference engine cannot resolve the conflict automatically because that would involve changing a user setting. Any attempt to generate a build tree will fail:

$ ecosconfig --srcdir /home/bartv/ecc/ecc tree

C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM

Unable to generate build tree, this configuration still contains conflicts.

Either resolve the conflicts or use --ignore-errors

It is still possible to generate a build tree:

$ ecosconfig --srcdir /home/bartv/ecc/ecc --ignore-errors tree

C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM

$ make

In this case eCos will fail to build. In other cases of unresolved conflicts eCos may build, but may not run.

In general all conflicts should be resolved by editing the ecos.ecc

file, by letting the inference engine make appropriate changes, or by other means, before any attempt is made to build or run eCos.

Building the System

Once a build tree has been generated with ecosconfig, building eCos is straightforward:

$ make

The build tree contains the subdirectories, makefiles, and everything else that is needed to generate the default configuration for the selected architecture and platform. The only requirement is that the tools needed for that architecture, for example powerpc-eabi-g++, are available using the standard search path. If this is not the case then the make will fail with an error message. If you have a multiprocessor system then it may be more efficient to use:

$ make -j n where n is equal to the number of processors on your system.

Once the make process has completed, the install tree will contain the header files and the target library that are needed for application development.

It is also possible to build the system’s test cases for the current configuration:

$ make tests

The resulting test executables will end up in a tests subdirectory of the install tree.

If disk space is scarce then it is possible to make the copy of the install tree for application development purposes, and then use:

$ make clean

The build tree will now use up a minimum of disk space — the bulk of what is left consists of configuration header files that you may have edited and hence should not be deleted automatically. However, it is possible to rebuild the system at any time without re-invoking ecosconfig, just by running make again.

Under exceptional circumstances it may be necessary to run make clean for other reasons, such as when a new release of the toolchain is installed. The toolchain includes a number of header files which are closely tied to the compiler, for example limits.h

, and these header files are not and should not be duplicated by eCos. The makefiles perform header file dependency analysis, so that when a header file is changed all affected sources

Chapter 28. Manual Configuration will be rebuilt during the next make. This is very useful when the configuration header files are changed, but it also means that a build tree containing information about the locations of header files must be rebuilt. If a new version of the toolchain is installed and the old version is removed then this location information is no longer accurate, and make will complain that certain dependencies cannot be satisfied. Under such circumstances it is necessary to do a make clean first.

Packages

eCos is a component architecture. The system comes as a number of packages which can be enabled or disabled as required, and new packages can be added as they become available. Unfortunately, the packages are not completely independent: for example the µITRON compatibility package relies almost entirely on functionality provided by the kernel package, and it would not make sense to try to build µITRON if the kernel was disabled. The C library has fewer dependencies: some parts of the C library rely on kernel functionality, but it is possible to disable these parts and thus build a system that has the C library but no kernel. The ecosconfig tool has the capability of checking that all the dependencies are satisfied, but it may still be possible to produce configurations that will not build or (conceivably) that will build but not run. Developers should be aware of this and take appropriate care.

By default, ecosconfig will include all packages that are appropriate for the specified hardware in the configuration. The common HAL package and the eCos infrastructure must be present in every configuration. In addition, it is always necessary to have one architectural HAL package and one platform HAL package. Other packages are optional, and can be added or removed from a configuration as required.

The application may not require all of the packages; for example, it might not need the µITRON compatibility package, or the floating point support provided by the math library. There is a slight overhead when eCos is built because the packages will get compiled, and there is also a small disk space penalty. However, any unused facilities will get stripped out at link-time, so having redundant packages will not affect the final executable.

Coarse-grained Configuration

Coarse-grained configuration of an eCos system means making configuration changes using the ecosconfig tool. These changes include:

1. switching to different target hardware

2. switching to a different template

3. adding or removing a package

4. changing the version of a package

Whenever ecosconfig generates or updates an eCos configuration, it generates a configuration save file.

Suppose that the configuration was first created using the following command line:

$ ecosconfig new stdeval1

To change the target hardware to the Cogent CMA28x PowerPC board, the following command would be needed:

$ ecosconfig target cma28x

To switch to the PowerPC simulator instead:

Chapter 28. Manual Configuration

$ ecosconfig target psim

As the hardware changes, hardware-related packages such as the HAL packages and device drivers will be added to and removed from the configuration as appropriate.

To remove any package from the current configuration, use the remove command:

$ ecosconfig remove uitron

You can disable multiple packages using multiple arguments, for example:

$ ecosconfig remove uitron libm

If this turns out to have been a mistake then you can re-enable one or more packages with the add command:

$ ecosconfig add libm

Changing the desired version for a package is also straightforward:

$ ecosconfig version v2_1 kernel

It is necessary to regenerate the build tree and header files following any changes to the configuration before rebuilding eCos:

$ ecosconfig tree

Fine-grained Configuration

ecosconfig only provides coarse-grained control over the configuration: the hardware, the template and the packages that should be built. Unlike the Configuration Tool, ecosconfig does not provide any facilities for manipulating finer-grained configuration options such as how many priority levels the scheduler should support. There are hundreds of these options, and manipulating them by means of command line arguments would not be sensible.

In the current system fine-grained configuration options may be manipulated by manual editing of the configuration file. When a file has been edited in this way, the ecosconfig tool should be used to check the configuration for any conflicts which may have been introduced:

$ ecosconfig check

The check command will list all conflicts and will also rewrite the configuration file, propagating any changes which affect other options. The user may choose to resolve the conflicts either by re-editing the configuration file manually or by invoking the inference engine using the resolve command:

$ ecosconfig resolve

The resolve command will list all conflicts which can be resolved and save the resulting changes to the configuration.

It is necessary to regenerate the build tree and header files following any changes to the configuration before rebuilding eCos:

$ ecosconfig tree

All the configuration options and their descriptions are listed in the eCos Reference Manual.

Chapter 28. Manual Configuration

Editing an eCos Savefile

The eCos configuration information is held in a single savefile, typically ecos.ecc

, which can be generated by either the GUI configuration tool or by the command line ecosconfig tool. The file normally exists at the top level of the build tree. It is a text file, allowing the various configurations options to be edited inside a suitable text editor or by other programs or scripts, as well as in the GUI config tool.

An eCos savefile is actually a script in the Tcl programming language, so any modifications to the file need to preserve Tcl syntax. For most configuration options, any modifications will be trivial and there is no need to worry about Tcl syntax. For example, changing a 1 to a 0 to disable an option. For more complicated options, for example CYGDAT_UITRON_TASK_EXTERNS , which involves some lines of C code, more care has to be taken.

If an edited savefile is no longer a valid Tcl script then the configuration tools will be unable to read back the data for further processing, for example to generate a build tree. An outline of Tcl syntax is given below. One point worth noting here is that a line that begins with a “#” is usually a comment, and the bulk of an eCos savefile actually consists of such comments, to make it easier to edit.

Header

An eCos savefile begins with a header, which typically looks something like this:

# eCos saved configuration

# ---- commands --------------------------------------------------------

# This section contains information about the savefile format.

# It should not be edited. Any modifications made to this section

# may make it impossible for the configuration tools to read

# the savefile.

cdl_savefile_version 1; cdl_savefile_command cdl_savefile_version {}; cdl_savefile_command cdl_savefile_command {}; cdl_savefile_command cdl_configuration { description hardware template package }; cdl_savefile_command cdl_package { value_source user_value wizard_value inferred_value }; cdl_savefile_command cdl_component { value_source user_value wizard_value inferred_value }; cdl_savefile_command cdl_option { value_source user_value wizard_value inferred_value }; cdl_savefile_command cdl_interface { value_source user_value wizard_value inferred_value };

This section of the savefile is intended for use by the configuration system, and should not be edited. If this section is edited then the various configuration tools may no longer be able to read in the modified savefile.

Toplevel Section

The header is followed by a section that defines the configuration as a whole. A typical example would be:

# ---- toplevel --------------------------------------------------------

# This section defines the toplevel configuration object. The only

# values that can be changed are the name of the configuration and

# the description field. It is not possible to modify the target,

# the template or the set of packages simply by editing the lines

# below because these changes have wide-ranging effects. Instead

# the appropriate tools should be used to make such modifications.

cdl_configuration eCos { description ““ ;

Chapter 28. Manual Configuration

# These fields should not be modified.

hardware pid ; template uitron ; package -hardware CYGPKG_HAL_ARM current ; package -hardware CYGPKG_HAL_ARM_PID current ; package -hardware CYGPKG_IO_SERIAL current ; package -template CYGPKG_HAL current ; package -template CYGPKG_IO current ; package -template CYGPKG_INFRA current ; package -template CYGPKG_KERNEL current ; package -template CYGPKG_UITRON current ; package -template CYGPKG_LIBC current ; package -template CYGPKG_LIBM current ; package -template CYGPKG_DEVICES_WALLCLOCK current ; package -template CYGPKG_ERROR current ;

};

This section allows the configuration tools to reload the various packages that make up the configuration. Most of the information should not be edited. If it is necessary to add a new package or to remove an existing one then the appropriate tools should be used for this, for example:

$ ecosconfig remove CYGPKG_LIBM

There are two fields which can be edited. Configurations have a name; in this case eCos. They can also have a description, which is some arbitrary text. The configuration tools do not make use of these fields, they exist so that users can store additional information about a configuration.

Conflicts Section

The toplevel section is followed by details of all the conflicts (if any) in the configuration, for example:

# ---- conflicts -------------------------------------------------------

# There are 2 conflicts.

# option CYGNUM_LIBC_TIME_DST_DEFAULT_OFFSET

# Property LegalValues

Illegal current value 100000

Legal values are: -90000 to 90000

# option CYGSEM_LIBC_TIME_CLOCK_WORKING

Property Requires

Requires constraint not satisfied: CYGFUN_KERNEL_THREADS_TIMER

When editing a configuration you may end up with something that is invalid. Any problems in the configuration will be reported in the conflicts section. In this case there are two conflicts. The option

CYGNUM_LIBC_TIME_DST_DEFAULT_OFFSET has been given an illegal value: typically this would be fixed by searching for the definition of that option later on in the savefile and modifying the value. The second conflict is more interesting, an unsatisfied requires constraint. Configuration options are not independent: disabling some functionality in, say, the kernel, can have an impact elsewhere; in this case the C library.

The various dependencies between the options are specified by the component developers and checked by the configuration system. In this case there are two obvious ways in which the conflict could be resolved: re-enabling CYGFUN_KERNEL_THREADS_TIMER , or disabling CYGSEM_LIBC_TIME_CLOCK_WORKING . Both of these options will be listed later on in the file.

Chapter 28. Manual Configuration

Some care has to be taken when modifying configuration options, to avoid introducing new conflict.

For instance it is possible that there might be other options in the system which have a dependency on

CYGSEM_LIBC_TIME_CLOCK_WORKING , so disabling that option may not be the best way to resolve the conflict.

Details of all such dependencies are provided in the appropriate places in the savefile.

It is not absolutely required that a configuration be conflict-free before generating a build tree and building eCos. It is up to the developers of each component to decide what would happen if an attempt is made to build eCos while there are still conflicts. In serious cases there is likely to be a compile-time failure, or possibly a link-time failure. In less serious cases the system may build happily and the application can be linked with the resulting library, but the component may not quite function as intended - although it may still be good enough for the specific needs of the application. It is also possible that everything builds and links, but once in a while the system will unaccountably crash. Using a configuration that still has conflicts is done entirely at the user’s risk.

Data Section

The bulk of the savefile lists the various packages, components, and options, including their values and the various dependencies. A number of global options come first, especially those related to the build process such as compiler flags. These are followed by the various packages, and the components and options within those packages, in order.

Packages, components and options are organized in a hierarchy. If a particular component is disabled then all options and sub-components below it will be inactive: any changes made to these will have no effect. The savefile contains information about the hierarchy in the form of comments, for example: cdl_package CYGPKG_KERNEL ...

# > cdl_component CYGPKG_KERNEL_EXCEPTIONS ...

# > cdl_option CYGSEM_KERNEL_EXCEPTIONS_DECODE ...

cdl_option CYGSEM_KERNEL_EXCEPTIONS_GLOBAL ...

# < cdl_component CYGPKG_KERNEL_SCHED ...

# > cdl_option CYGSEM_KERNEL_SCHED_MLQUEUE ...

cdl_option CYGSEM_KERNEL_SCHED_BITMAP ...

# <

This corresponds to the following hierarchy:

CYGPKG_KERNEL

CYGPKG_KERNEL_EXCEPTIONS

CYGSEM_KERNEL_EXCEPTIONS_DECODE

CYGSEM_KERNEL_EXCEPTIONS_GLOBAL

CYGPKG_KERNEL_SCHED

CYGSEM_KERNEL_SCHED_MLQUEUE

CYGSEM_KERNEL_SCHED_BITMAP

Providing the hierarchy information in this way allows programs or scripts to analyze the savefile and readily determine the hierarchy. It could also be used by a sufficiently powerful editor to support structured editing of eCos savefiles. The information is not used by the configuration tools themselves since they obtain the hierarchy from the original CDL scripts.

Each configurable entity is preceded by a comment, of the following form:

Chapter 28. Manual Configuration

# Kernel schedulers

# doc: ref/ecos-ref/ecos-kernel-overview.html#THE-SCHEDULER

# The eCos kernel provides a choice of schedulers. In addition

# there are a number of configuration options to control the

# detailed behaviour of these schedulers.

cdl_component CYGPKG_KERNEL_SCHED {

...

};

This provides a short textual alias Kernel schedulers for the component. If online documentation is available for the configurable entity then this will come next. Finally there is a short description of the entity as a whole.

All this information is provided by the component developers.

Each configurable entity takes the form:

< type > < name > {

< data >

};

Configurable entities may not be active. This can be either because the parent is disabled or inactive, or because there are one or more active_if properties. Modifying the value of an inactive entity has no effect on the configuration, so this information is provided first: cdl_option CYGSEM_KERNEL_EXCEPTIONS_DECODE {

# This option is not active

# The parent CYGPKG_KERNEL_EXCEPTIONS is disabled

...

};

...

cdl_option CYGIMP_IDLE_THREAD_YIELD {

# This option is not active

# ActiveIf constraint: (CYGNUM_KERNEL_SCHED_PRIORITIES == 1)

...

CYGNUM_KERNEL_SCHED_PRIORITIES == 32

-> 0

};

For

CYGIMP_IDLE_THREAD_YIELD the savefile lists the expression that must be satisfied if the option is to be active, followed by the current value of all entities that are referenced in the expression, and finally the result of evaluating that expression.

Not all options are directly modifiable in the savefile. First, the value of packages (which is the version of that package loaded into the configuration) cannot be modified here.

cdl_package CYGPKG_KERNEL {

# Packages cannot be added or removed, nor can their version be changed,

# simply by editing their value. Instead the appropriate configuration

# should be used to perform these actions.

...

};

The version of a package can be changed using e.g.:

$ ecosconfig version 1.3 CYGPKG_KERNEL

Even though a package’s value cannot be modified here, it is still important for the savefile to contain the details. In particular packages may impose constraints on other configurable entities and may be referenced by

Chapter 28. Manual Configuration other configurable entities. Also it would be difficult to understand or extract the configuration’s hierarchy if the packages were not listed in the appropriate places in the savefile.

Some components (or, conceivably, options) do not have any associated data. Typically they serve only to introduce another level in the hierarchy, which can be useful in the context of the GUI configuration tool.

cdl_component CYGPKG_HAL_COMMON_INTERRUPTS {

# There is no associated value.

};

Other components or options have a calculated value. These are not user-modifiable, but typically the value will depend on other options which can be modified. Such calculated options can be useful when controlling what gets built or what ends up in the generated configuration header files. A calculated value may also effect other parts of the configuration, for instance, via a requires constraint.

cdl_option BUFSIZ {

# Calculated value: CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO ? CYGNUM_LIBC_STDIO_BUFSIZE : 0

# CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO == 1

# CYGNUM_LIBC_STDIO_BUFSIZE == 256

# Current_value: 256

};

A special type of calculated value is the interface. The value of an interface is the number of active and enabled options which implement that interface. Again the value of an interface cannot be modified directly; only by modifying the options which implement the interface. However, an interface can be referenced by other parts of the configuration.

cdl_interface CYGINT_KERNEL_SCHEDULER {

# Implemented by CYGSEM_KERNEL_SCHED_MLQUEUE, active, enabled

# Implemented by CYGSEM_KERNEL_SCHED_BITMAP, active, disabled

# This value cannot be modified here.

# Current_value: 1

# Requires: 1 == CYGINT_KERNEL_SCHEDULER

# --

CYGINT_KERNEL_SCHEDULER == 1

> 1

# The following properties are affected by this value

# interface CYGINT_KERNEL_SCHEDULER

# Requires: 1 == CYGINT_KERNEL_SCHEDULER

};

If the configurable entity is modifiable then there will be lines like the following: cdl_option CYGSEM_KERNEL_SCHED_MLQUEUE {

...

# Flavor: bool

# No user value, uncomment the following line to provide one.

# user_value 1

# value_source default

# Default value: 1

...

};

Configurable entities can have one of four different flavors: none, bool, data and booldata. Flavor none indicates that there is no data associated with the entity, typically it just acts as a placeholder in the overall hierarchy.

Flavor bool is the most common, it is a simple yes-or-no choice. Flavor data is for more complicated configuration choices, for instance the size of an array or the name of a device. Flavor booldata is a combination

Chapter 28. Manual Configuration of bool and data: the option can be enabled or disabled, and there is some additional data associated with the option as well.

In the above example the user has not modified this particular option, as indicated by the comment and by the commented-out user_value line. To disable this option the file should be edited to: cdl_option CYGSEM_KERNEL_SCHED_MLQUEUE {

...

# Flavor: bool

# No user value, uncomment the following line to provide one.

user_value 0

# value_source default

# Default value: 1

...

}

The comment preceding the user_value 0 line can be removed if desired, otherwise it will be removed automatically the next time the file is read and updated by the configuration tools.

Much the same process should be used for options with the data flavor, for example: cdl_option CYGNUM_LIBC_TIME_DST_DEFAULT_OFFSET {

# Flavor: data

# No user value, uncomment the following line to provide one.

# user_value 3600

# value_source default

# Default value: 3600

# Legal values: -90000 to 90000

}; can be changed to: cdl_option CYGNUM_LIBC_TIME_DST_DEFAULT_OFFSET {

# Flavor: data user_value 7200

# value_source default

# Default value: 3600

# Legal values: -90000 to 90000 };

Note that the original text provides the default value in the user_value comment, on the assumption that the desired new value is likely to be similar to the default value. The value_source comment does not need to be updated, it will be fixed up if the savefile is fed back into the configuration system and regenerated.

For options with the booldata flavor, the user_value line needs take two arguments. The first argument is for the boolean part, the second for the data part. For example: cdl_component CYGNUM_LIBM_COMPATIBILITY {

# Flavor: booldata

# No user value, uncomment the following line to provide one.

# user_value 1 POSIX

# value_source default

# Default value: 1 POSIX

# Legal values: “POSIX” “IEEE” “XOPEN” “SVID”

...

}; could be changed to:

Chapter 28. Manual Configuration cdl_component CYGNUM_LIBM_COMPATIBILITY {

# Flavor: booldata user_value 1 IEEE

# value_source default

# Default value: 1 POSIX

# Legal values: “POSIX” “IEEE” “XOPEN” “SVID”

...

}; or alternatively, if the whole component should be disabled, to: cdl_component CYGNUM_LIBM_COMPATIBILITY {

# Flavor: booldata user_value 0 POSIX

# value_source default

# Default value: 1 POSIX

# Legal values: “POSIX” “IEEE” “XOPEN” “SVID”

...

};

Some options take values that span multiple lines. An example would be: cdl_option CYGDAT_UITRON_MEMPOOLVAR_INITIALIZERS {

# Flavor: data

# No user value, uncomment the following line to provide one.

# user_value \

# “CYG_UIT_MEMPOOLVAR( vpool1, 2000 ), \\

# CYG_UIT_MEMPOOLVAR( vpool2, 2000 ), \\

# CYG_UIT_MEMPOOLVAR( vpool3, 2000 ),”

# value_source default

# Default value: \

# “CYG_UIT_MEMPOOLVAR( vpool1, 2000 ), \\

# CYG_UIT_MEMPOOLVAR( vpool2, 2000 ), \\

};

CYG_UIT_MEMPOOLVAR( vpool3, 2000 ),”

Setting a user value for this option involves uncommenting and modifying all relevant lines, for example: cdl_option CYGDAT_UITRON_MEMPOOLVAR_INITIALIZERS {

# Flavor: data user_value \

“CYG_UIT_MEMPOOLVAR( vpool1, 4000 ), \\

CYG_UIT_MEMPOOLVAR( vpool2, 4000 ),”

# value_source default

# Default value: \

# “CYG_UIT_MEMPOOLVAR( vpool1, 2000 ), \\

# CYG_UIT_MEMPOOLVAR( vpool2, 2000 ), \\

};

CYG_UIT_MEMPOOLVAR( vpool3, 2000 ),”

In such cases appropriate care has to be taken to preserve Tcl syntax, as discussed below.

The configuration system has the ability to keep track of several different values for any given option. All options start off with a default value, in other words their value source is set to default

. If a configuration involves conflicts and the configuration system’s inference engine is allowed to resolve these automatically then it may provide an inferred value instead, for example: cdl_option CYGMFN_KERNEL_SYNCH_CONDVAR_TIMED_WAIT {

# Flavor: bool

# No user value, uncomment the following line to provide one.

Chapter 28. Manual Configuration

# user_value 1

# The inferred value should not be edited directly.

inferred_value 0

# value_source inferred

# Default value: 1

...

};

Inferred values are calculated by the configuration system and should not be edited by the user. If the inferred value is not correct then a user value should be substituted instead: cdl_option CYGMFN_KERNEL_SYNCH_CONDVAR_TIMED_WAIT {

# Flavor: bool user_value 1

# The inferred value should not be edited directly.

inferred_value 0

# value_source inferred

# Default value: 1

...

};

The inference engine will not override a user value with an inferred one. Making a change like this may well re-introduce a conflict, since the inferred value was only calculated to resolve a conflict. Another run of the inference engine may find a different and more acceptable way of resolving the conflict, but this is not guaranteed and it may be up to the user to examine the various dependencies and work out an acceptable solution.

Inferred values are listed in the savefile because the exact inferred value may depend on the order in which changes were made and conflicts were resolved. If the inferred values were absent then it is possible that reloading a savefile would not exactly restore the configuration. Default values on the other hand are entirely deterministic so there is no actual need for the values to be listed in the savefile. However, the default value can be very useful information so it is provided in a comment.

Occasionally the user will want to do some experimentation, and temporarily switch an option from a user value back to a default or inferred one to see what the effect would be. This could be achieved by simply commenting out the user value. For instance, if the current savefile contains: cdl_option CYGMFN_KERNEL_SYNCH_CONDVAR_TIMED_WAIT {

# Flavor: bool user_value 1

# The inferred value should not be edited directly.

inferred_value 0

# value_source user

# Default value: 1

...

}; then the inferred value could be restored by commenting out or removing the user_value line: cdl_option CYGMFN_KERNEL_SYNCH_CONDVAR_TIMED_WAIT {

# Flavor: bool

# user_value 1

# The inferred value should not be edited directly.

inferred_value 0

# value_source user

# Default value: 1

...

};

Chapter 28. Manual Configuration

This is fine for simple values. However if the value is complicated then there is a problem: commenting out the user_value line or lines means that the user value becomes invisible to the configuration system, so if the savefile is loaded and then regenerated the information will be lost. An alternative approach is to keep the user_value but explicitly set the value_source line, for example: cdl_option CYGMFN_KERNEL_SYNCH_CONDVAR_TIMED_WAIT {

# Flavor: bool user_value 1

# The inferred value should not be edited directly.

inferred_value 0 value_source inferred

# Default value: 1

...

};

In this case the configuration system will use the inferred value for the purposes of dependency analysis etc., even though a user value is present. To restore the user value the value_source line can be commented out again. If there is no explicit value_source then the configuration system will just use the highest priority one: the user value if it exists; otherwise the inferred value if it exists; otherwise the default value which always exists.

The default value for an option can be a simple constant, or it can be an expression involving other options. In the latter case the expression will be listed, together with the values for all options referenced in the expression and the current result of evaluating that expression. This is for informational purposes only, the default value is always recalculated deterministically when loading in a savefile.

cdl_option CYGBLD_GLOBAL_COMMAND_PREFIX {

# Flavor: data

# No user value, uncomment the following line to provide one.

# user_value arm-elf

# value_source default

# Default value: CYGHWR_THUMB ? “thumb-elf” : “arm-elf”

};

CYGHWR_THUMB == 0

-> arm-elf

For options with the data or booldata flavor, there are likely to be constraints on the possible values. If the value is supposed to be a number in a given range and a user value of “ hello world ” is provided instead then there are likely to be compile-time failures. Component developers can specify constraints on the legal values, and these will be listed in the savefile.

cdl_option X_TLOSS {

# Flavor: data

# No user value, uncomment the following line to provide one.

# user_value 1.41484755040569E+16

# value_source default

# Default value: 1.41484755040569E+16

# Legal values: 1 to 1e308

}; cdl_component CYGNUM_LIBM_COMPATIBILITY {

# Flavor: booldata

# No user value, uncomment the following line to provide one.

# user_value 1 POSIX

# value_source default

# Default value: 1 POSIX

# Legal values: “POSIX” “IEEE” “XOPEN” “SVID”

...

Chapter 28. Manual Configuration

};

In some cases the legal values list may be an expression involving other options. If so then the current values of the referenced options will be listed, together with the result of evaluating the list expression, just as for default value expressions.

If an illegal value is provided then this will result in a conflict, listed in the conflicts section of the savefile. For more complicated options a simple legal values list is not sufficient to allow the current value to be validated, and the configuration system will be unable to flag conflicts. This issue will be addressed in future releases of the configuration system.

Following the value-related fields for a given option, any requires constraints belonging to this option will be listed. These constraints are only effective if the option is active and, for bool and booldata flavors, enabled.

If some aspect of eCos functionality is inactive or disabled then it cannot impose any constraints on the rest of the system. As usual, the full expression will be listed followed by the current values of all options that are referenced and the result of evaluating the expression: cdl_option CYGSEM_LIBC_TIME_TIME_WORKING {

...

# Requires: CYGPKG_DEVICES_WALLCLOCK

};

CYGPKG_DEVICES_WALLCLOCK == current

-> 1

When modifying the value of an option it is useful to know not only what constraints the option imposes on the rest of the system but also what other options in the system depend in some way on this one. The savefile provides this information: cdl_option CYGFUN_KERNEL_THREADS_TIMER {

...

# The following properties are affected by this value

# option CYGMFN_KERNEL_SYNCH_CONDVAR_TIMED_WAIT

# Requires: CYGFUN_KERNEL_THREADS_TIMER

# option CYGIMP_UITRON_STRICT_CONFORMANCE

# Requires: CYGFUN_KERNEL_THREADS_TIMER

# option CYGSEM_LIBC_TIME_CLOCK_WORKING

# Requires: CYGFUN_KERNEL_THREADS_TIMER

};

Tcl Syntax

eCos savefiles are implemented as Tcl scripts, and are read in by running the data through a standard Tcl interpreter that has been extended with a small number of additional commands such as cdl_option and cdl_configuration . In many cases this is an implementation detail that can be safely ignored while editing a savefile: simply replacing a 1 with a 0 to disable some functionality is not going to affect whether or not the savefile is still a valid Tcl script and can be processed by a Tcl interpreter. However, there are more complicated cases where an understanding of Tcl syntax is at least desirable, for example: cdl_option CYGDAT_UITRON_MEMPOOLVAR_EXTERNS {

# Flavor: data user_value \

“static char vpool1\[ 2000 \], \\ vpool2\[ 2000 \], \\ vpool3\[ 2000 \];”

# value_source default

# Default value: \

# “static char vpool1\[ 2000 \], \\

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Chapter 28. Manual Configuration

# vpool2\[ 2000 \], \\ vpool3\[ 2000 \];”

};

The backslash at the end of the user_value line is processed by the Tcl interpreter as a line continuation character. The quote marks around the user data are also interpreted by the Tcl interpreter and serve to turn the entire data field into a single argument. The backslashes preceding the opening and closing square brackets prevent the Tcl interpreter from treating these characters specially, otherwise there would be an attempt at

command substitution as described below. The double backslashes at the end of each line of the data will be turned into a single backslash by the Tcl interpreter, rather than escaping the newline character, so that the actual data seen by the configuration system is: static char vpool1[ 2000 ], \ vpool2[ 2000 ], \ vpool3[ 2000 ];

This is of course the data that should end up in the µITRON configuration header file. The opening and closing braces surrounding the entire body of the option data are also significant and cause this body to be passed as a single argument to the cdl_option command. The closing semicolon is optional in this example, but provides a small amount of additional robustness if the savefile is edited such that it is no longer a valid Tcl script. If the data contained any

$ characters then these would have to be treated specially as well, via a backslash escape.

In spite of what all the above might seem to suggest, Tcl is actually a very simple yet powerful scripting language: the syntax is defined by just eleven rules. On occasion this simplicity means that Tcl’s behaviour is subtly different from other languages, which can confuse newcomers.

When the Tcl interpreter is passed some data such as puts Hello , it splits this data into a command and its arguments. The command will be terminated by a newline or by a semicolon, unless one of the quoting mechanisms is used. The command and each of its arguments are separated by white space. So in the following example: puts Hello set x 42 will result in two separate commands being executed. The first command is puts and is passed a single argument, Hello . The second command is set and is passed two arguments, x and 42 . The intervening newline character serves to terminate the first command, and a semi-colon separator could be used instead: puts Hello;set x 42

Any white space surrounding the semicolon is just ignored because it does not serve to separate arguments.

Now consider the following: set x Hello world

This is not valid Tcl. It is an attempt to invoke the set command with three arguments: x

Hello

, and world

The set only takes two arguments, a variable name and a value, so it is necessary to combine the data into a single argument by quoting: set x “Hello world”

When the Tcl interpreter encounters the first quote character it treats all subsequent data up to but not including the closing quote as part of the current argument. The quote marks are removed by the interpreter, so the second argument passed to the set command is just Hello world without the quote characters. This can be significant in the context of eCos savefiles. For instance, consider the following configuration option: cdl_option CYGDAT_LIBC_STDIO_DEFAULT_CONSOLE {

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Chapter 28. Manual Configuration

# Flavor: data

# No user value, uncomment the following line to provide one.

# user_value “\”/dev/ttydiag\””

# value_source default

# Default value: “\”/dev/ttydiag\””

};

The desired value of the configuration option should be a valid C string, complete with quote characters. If the savefile was edited to: cdl_option CYGDAT_LIBC_STDIO_DEFAULT_CONSOLE {

# Flavor: data user_value “/dev/ttydiag”

# value_source default

# Default value: “\”/dev/ttydiag\””

}; then the Tcl interpreter would remove the quote marks when the savefile is read back in, so the option’s value would not have any quote marks and would not be a valid C string. The configuration system is not yet able to perform the required validation so the following

#define would be generated in the configuration header file:

#define CYGDAT_LIBC_STDIO_DEFAULT_CONSOLE /dev/ttydiag

This is likely to cause a compile-time failure when building eCos.

A quoted argument continues until the closing quote character is encountered, which means that it can span multiple lines. This can also be encountered in eCos savefiles, for instance, in the

CYGDAT_UITRON_MEMPOOLVAR_EXTERNS example mentioned earlier. Newline or semicolon characters do not terminate the current command in such cases.

The Tcl interpreter supports much the same forms of backslash substitution as other common programming languages. Some backslash sequences such as

\n will be replaced by the appropriate character. The sequence

\\ will be replaced by a single backslash. A backslash at the very end of a line will cause that backslash, the newline character, and any white space at the start of the next line to be replaced by a single space. Hence the following two Tcl commands are equivalent: puts “Hello\nworld\n” puts \

“Hello world

“

In addition to quote and backslash characters, the Tcl interpreter treats square brackets, the $ character, and braces specially. Square brackets are used for command substitution, for example: puts “The answer is [expr 6 * 9]”

When the Tcl interpreter encounters the square brackets it will treat the contents as another command that should be executed first, and the result of executing that is used when continuing to process the script. In this case the Tcl interpreter will execute the command expr 6 * 9 , yielding a result of 54, and then the Tcl interpreter will execute puts “The answer is 54” . It should be noted that the interpreter contains only one level of substitution: if the result of performing command substitution performs further special characters such as square brackets then these will not be treated specially.

Command line substitution is very unlikely to prove useful in the context of an eCos savefile, but it is part of the Tcl language and hence cannot be easily suppressed while reading in a savefile. As a result care has to be taken when savefile data involves square brackets. Consider the following: cdl_option CYGDAT_UITRON_MEMPOOLFIXED_EXTERNS {

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Chapter 28. Manual Configuration

“static char fpool1[ 2000 ], fpool2[ 2000 ];”

...

};

...

user_value \

The Tcl interpreter will interpret the square brackets as an attempt at command substitution and hence it will attempt to execute the command

2000 with no arguments. No such command is defined by the Tcl language or by the savefile-related extensions provided by the configuration system, so this will result in an error when an attempt is made to read back the savefile. Instead it is necessary to backslash-escape the square brackets and thus suppress command substitution: cdl_option CYGDAT_UITRON_MEMPOOLFIXED_EXTERNS {

...

user_value \

“static char fpool1\[ 2000 \], fpool2\[ 2000 \];”

...

};

Similarly the $ character is used in Tcl scripts to perform variable substitution: set x [expr 6 * 9] puts “The answer is $x”

Variable substitution, like command substitution, is very unlikely to prove useful in the context of an eCos savefile. Should it be necessary to have a

$ character in configuration data then again a backslash escape needs to be used.

cdl_option FOODAT_MONITOR_PROMPT {

...

user_value “\$ “

...

};

Braces are used to collect a sequence of characters into a single argument, just like quotes. The difference is that variable, command and backslash substitution do not occur inside braces (with the sole exception of backslash substitution at the end of a line). So, for example, the CYGDAT_UITRON_MEMPOOL_EXTERNFIXED_EXTERNS value could be written as: cdl_option CYGDAT_UITRON_MEMPOOLFIXED_EXTERNS {

...

user_value \

{static char fpool1[ 2000 ], fpool2[ 2000 ];}

...

};

The configuration system does not use this when generating savefiles because for simple edits of a savefile by inexperienced users the use of brace characters is likely to be a little bit more confusing than the use of quotes.

At this stage it is worth noting that the basic format of each configuration option in the savefile makes use of braces: cdl_option < name > {

...

};

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Chapter 28. Manual Configuration

The configuration system extends the Tcl language with a small number of additional commands such as cdl_option

. These commands take two arguments, a name and a body, where the body consists of all the text between the braces. First a check is made that the specified option is actually present in the configuration. Then the body is executed in a recursive invocation of the Tcl interpreter, this time with additional commands such as user_value and value_source . If, after editing, the braces are not correctly matched up then the savefile will no longer be a valid Tcl script and errors will be reported when the savefile is loaded again.

Comments in Tcl scripts are introduced by a hash character # . However, a hash character only introduces a comment if it occurs where a command is expected. Consider the following:

# This is a comment puts “Hello” # world

The first line is a valid comment, since the hash character occurs right at the start where a command name is expected. The second line does not contain a comment. Instead it is an attempt to invoke the puts command with three arguments: Hello , # and world . These are not valid arguments for the puts command so an error will be raised.

If the second line was rewritten as: puts “Hello”; # world then this is a valid Tcl script. The semicolon identifies the end of the current command, so the hash character occurs at a point where the next command would start and hence it is interpreted as the start of a comment.

This handling of comments can lead to subtle behaviour. Consider the following: cdl_option WHATEVER {

# This is a comment } user_value 42

...

}

Consider the way the Tcl interpreter processes this. The command name and the first argument do not pose any special difficulties. The opening brace is interpreted as the start of the next argument, which continues until a closing brace is encountered. In this case the closing brace occurs on the second line, so the second argument passed to cdl_option is \n # This is a comment . This second argument is processed in a recursive invocation of the Tcl interpreter and does not contain any commands, just a comment. Toplevel savefile processing then resumes, and the next command that is encountered is user_value

. Since the relevant savefile code is not currently processing a configuration option this is an error. Later on the Tcl interpreter would encounter a closing brace by itself, which is also an error. Fortunately this sequence of events is very unlikely to occur when editing generated savefiles.

This should be sufficient information about Tcl to allow for safe editing of eCos savefiles. Further information is available from a wide variety of sources, for example the book Tcl and the Tk Toolkit by John K Ousterhout.

Editing the Sources

For many users, controlling the packages and manipulating the available configuration options will be sufficient to create an embedded operating system that meets the application’s requirements. However, since eCos is shipped entirely in source form, it is possible to go further when necessary: you can edit the eCos sources themselves. This requires some understanding of the way the eCos build system works.

The most obvious place to edit the source code is directly in the component repository. For example, you could edit the file kernel/<version>/src/sync/mutex.cxx

to change the way kernel mutexes work, or possibly

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Chapter 28. Manual Configuration just to add some extra diagnostics or assertions. Once the file has been edited, it is possible to invoke make at the top level of the build tree and the target library will be rebuilt as required. A small optimization is possible: the build tree is largely a mirror of the component repository, so it too will contain a subdirectory kernel/<version> ; if make is invoked in this directory then it will only check for changes to the kernel sources, which is a bit more efficient than checking for changes throughout the component repository.

Editing a file in the component repository is fine if this tree is used for only one eCos configuration. If the repository is used for several different configurations, however, and especially if it is shared by multiple users, then making what may be experimental changes to the master sources would be a bad idea. The build system provides an alternative. It is possible to make a copy of the file in the build tree, in other words copy mutex.cxx

from the kernel/<version>/src/sync directory in the component repository to kernel/<version>/src/sync in the build tree, and edit the file in the build tree. When make is invoked it will pick up local copies of any of the sources in preference to the master versions in the component repository.

Once you have finished modifying the eCos sources you can install the final version back in the component repository. If the changes were temporary in nature and only served to aid the debugging process, then you can discard the modified version of the sources.

The situation is slightly more complicated for the header files that a package may export, such as the C library’s stdio.h

header file, which can be found in the directory language/c/libc/<version>/include . If such a header file is changed, either directly in the component repository or after copying it to the build tree, then

make must be invoked at the top level of the build tree. In cases like this it is not safe to rebuild just the C library because other packages may depend on the contents of stdio.h

Modifying the Memory Layout

Each eCos platform package is supplied with linker script fragments which describe the location of memory regions on the evaluation board and the location of memory sections within these regions. The correct linker script fragment is selected and included in the eCos linker script target.ld

when eCos is built.

It is not necessary to modify the default memory layouts in order to start development with eCos. However, it will be necessary to edit a linker script fragment when the memory map of the evaluation board is changed.

For example, if additional memory is added, the linker must be notified that the new memory is available for use. As a minimum, this would involve modifying the length of the corresponding memory region. Where the available memory is non-contiguous, it may be necessary to declare a new memory region and reassign certain linker output sections to the new region.

Linker script fragments and memory layout header files should be edited within the eCos install tree. They are located at include/pkgconf/mlt_*.* . Where multiple start-up types are in use, it will be necessary to edit multiple linker script fragments and header files. The information provided in the header file and the corresponding linker script fragment must always match. A typical linker script fragment is shown below:

Example 28-1. eCos linker script fragment

MEMORY

{

} rom : ORIGIN = 0x40000000, LENGTH = 0x80000 ram : ORIGIN = 0x48000000, LENGTH = 0x200000

SECTIONS

{

SECTIONS_BEGIN

SECTION_rom_vectors (rom, 0x40000000, LMA_EQ_VMA)

SECTION_text (rom, ALIGN (0x1), LMA_EQ_VMA)

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Chapter 28. Manual Configuration

SECTION_fini (rom, ALIGN (0x1), LMA_EQ_VMA)

SECTION_rodata (rom, ALIGN (0x1), LMA_EQ_VMA)

SECTION_rodata1 (rom, ALIGN (0x1), LMA_EQ_VMA)

SECTION_fixup (rom, ALIGN (0x1), LMA_EQ_VMA)

SECTION_gcc_except_table (rom, ALIGN (0x1), LMA_EQ_VMA)

}

SECTION_data (ram, 0x48000000, FOLLOWING (.gcc_except_table))

SECTION_bss (ram, ALIGN (0x4), LMA_EQ_VMA)

SECTIONS_END

The file consists of two blocks, the MEMORY block contains lines describing the address ( ORIGIN ) and the size

( LENGTH ) of each memory region. The MEMORY block is followed by the SECTIONS block which contains lines describing each of the linker output sections. Each section is represented by a macro call. The arguments of these macros are ordered as follows:

1. The memory region in which the section will finally reside.

2. The final address ( VMA ) of the section. This is expressed using one of the following forms: n at the absolute address specified by the unsigned integer n

ALIGN (n) following the final location of the previous section with alignment to the next n-byte boundary

3. The initial address ( LMA ) of the section. This is expressed using one of the following forms:

LMA_EQ_VMA the

LMA equals the

VMA

(no relocation)

AT (n) at the absolute address specified by the unsigned integer n

FOLLOWING (.name) following the initial location of section name

In order to maintain compatibility with linker script fragments and header files exported by the eCos Configuration Tool, the use of other expressions within these files is not recommended.

Note that the names of the linker output sections will vary between target architectures. A description of these sections can be found in the specific GCC documentation for your architecture.

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Chapter 29. Managing the Package Repository

A source distribution of eCos consists of a number of packages, such as the kernel, the C library, and the

µITRON subsystems. These are individually versioned in the tree structure of the source code, to support distribution on a per-package basis and to support third party packages whose versioning systems might be different. The eCos Package Administration Tool is used to manage the installation and removal of packages from a variety of sources with potentially multiple versions.

The presence of the version information in the source tree structure might be a hindrance to the use of a separate source control system such as CVS or SourceSafe. To work in this way, you can rename all the version components to some common name (such as “current”) thus unifying the structure of source trees from distinct eCos releases.

The eCos build system will treat any such name as just another version of the package(s), and support building in exactly the same way. However, performing this rename invalidates any existing build trees that referred to the versioned source tree, so do the rename first, before any other work, and do a complete rebuild afterwards.

Package Installation

Package installation and removal is performed using the eCos Package Administration Tool. This tool is a Tcl script named ecosadmin.tcl which allows the user to add new eCos packages and new versions of existing packages to an eCos repository. Such packages must be distributed as a single file in the eCos package distribution format. Unwanted packages may also be removed from the repository using this tool. A graphical version of the tool is provided as part of the eCos Configuration Tool.

Using the Administration Tool

The graphical version of the eCos Package Administration Tool, provided as part of the eCos Configuration

Tool, provides functions equivalent to the command-line version for those who prefer a Windows-based interface.

It may be invoked in one of two ways:

• from the start menu (by default Start> Programs> eCos> Package Administration Tool )

• from the eCos Configuration Tool via the Tools> Administration menu item

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Chapter 29. Managing the Package Repository

The main window of the tool displays the packages which are currently installed in the form of a tree. The installed versions of each package may be examined by expanding the tree.

Packages may be added to the eCos repository by clicking on the Add button. The eCos package distribution file to be added is then selected via a File Open dialog box.

Packages may be removed by selecting a package in the tree and then clicking on the Remove button. If a package node is selected, all versions of the selected package will be removed. If a package version node is selected, only the selected version of the package will be removed.

Using the command line

The ecosadmin.tcl script is located in the base of the eCos repository. Use a command of the following form under versions of UNIX:

$ tclsh ecosadmin.tcl

< command >

Under Windows, a command of the following form may be used at the Cygwin command line prompt:

$ cygtclsh80 ecosadmin.tcl

< command >

The following commands are available:

add <file>

Adds the packages contained with the specified package distribution file to the eCos repository and updates the package database accordingly. By convention, eCos package distribution files are given the .epk

suffix.

remove <package> [ --version=<version> ]

Removes the specified package from the eCos repository and updates the package database accordingly.

Where the optional version qualifier is used, only the specified version of the package is removed.

list

Produces a list of the packages which are currently installed and their versions. The available templates and hardware targets are also listed.

Note that is is possible to remove critical packages such as the common HAL package using this tool. Users should take care to avoid such errors since core eCos packages may only be re-installed in the context of a complete re-installation of eCos.

Package Structure

The files in an installed eCos source tree are organized in a natural tree structure, grouping together files which work together into Packages. For example, the kernel files are all together in:

BASE_DIR/kernel/<version>/include/

BASE_DIR/kernel/<version>/src/

BASE_DIR/kernel/<version>/tests/ and µITRON compatibility layer files are in:

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Chapter 29. Managing the Package Repository

BASE_DIR/compat/uitron/<version>/include/

BASE_DIR/compat/uitron/<version>/src/

BASE_DIR/compat/uitron/<version>/tests/

The feature of these names which is of interest here is the <version> near the end. It may seem odd to place a version number deep in the path, rather than having something like

BASE_DIR/<version>/...everything...

or leaving it up to you to choose a different install-place when a new release of the system arrives.

There is a rationale for this organization: as indicated, the kernel and the µITRON compatibility subsystem are examples of software packages. For the first few releases of eCos, all the packages will move along in step, i.e. Release 1.3.x will feature Version 1.3.x of every package, and so forth. But in future, especially when third party packages become available, it is intended that the package be the unit of software distribution, so it will be possible to build a system from a selection of packages with different version numbers, and even differing versioning schemes. A Tcl script ecosadmin.tcl is provided in the eCos repository to manage the installation and removal of packages in this way.

Many users will have their own source code control system, version control system or equivalent, and will want to use it with eCos sources. In that case, since a new release of eCos comes with different pathnames for all the source files, a bit of work is necessary to import a new release into your source repository.

One way of handling the import is to rename all the version parts to some common name, for example “current”, and continue to work. “current” is suggested because ecosconfig recognizes it and places it first in any list of versions. In the future, we may provide a tool to help with this, or an option in the install wizard.

Alternatively, in a POSIX shell environment (Linux or Cygwin on Windows) use the following command: find . -name <version> -type d -printf ’mv %p %h/current\n’ | sh

Having carried out such a renaming operation, your source tree will now look like this:

BASE_DIR/kernel/current/include/

BASE_DIR/kernel/current/src/

BASE_DIR/kernel/current/tests/

...

BASE_DIR/compat/uitron/current/include/

BASE_DIR/compat/uitron/current/src/

BASE_DIR/compat/uitron/current/tests/ which is a suitable format for import into your own source code control system. When you get a subsequent release of eCos, do the same thing and use your own source code control system to manage the new source base, by importing the new version from

NEW_BASE_DIR/kernel/current/include/ and so on.

The eCos build tool will now offer only the “current” version of each package; select this for the packages you wish to use.

Making such a change has implications for any build trees you already have in use. A configured build tree contains information about the selected packages and their selected versions. Changing the name of the “versioning” folder in the source tree invalidates this information, and in consequence it also invalidates any local configuration options you have set up in this build tree. So if you want to change the version information in the source tree, do it first, before investing any serious time in configuring and building your system. When you create a new build tree to deal with the new source layout, it will contain default settings for all the configuration options, just like the old build tree did before you configured it. You will need to redo that configuration work in the new tree.

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Chapter 29. Managing the Package Repository

Moving source code around also invalidates debugging information in any programs or libraries built from the old tree; these will need to be rebuilt.

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VII. Appendixes

Appendix A. Target Setup

The following sections detail the setup of many of the targets supported by eCos.

Caution

This information is presented here only temporarily. It is intended that there will be separate documents detailing this information for each target in future releases. Consequently not much effort has been put into bringing the following documentation up to date -- much of it is obsolete, bogus or just plain wrong.

MN10300 stdeval1 Hardware Setup

The eCos Developer’s Kit package comes with a pair of EPROMs which provide GDB support for the Matsushita MN10300 (AM31) series evaluation board using CygMon, the Cygnus ROM monitor. Images of these EPROMs are also provided at BASE_DIR/loaders/mn10300-stdeval1/cygmon.bin

. The LSB EPROM

(LROM) is installed to socket IC8 on the board and the MSB EPROM (UROM) is installed to socket IC9. Attention should be paid to the correct orientation of these EPROMs during installation.

The CygMon stubs allows communication with GDB by way of the serial port at connector CN2. The communication parameters are fixed at 38400 baud, 8 data bits, no parity bit, and 1 stop bit (8-N-1). No flow control is employed. Connection to the host computer should be made using a standard RS232C serial cable (not a null modem cable). A gender changer may also be required.

MN10300 Architectural Simulator Setup

The MN10300 simulator is an architectural simulator for the Matsushita MN10300 that implements all features of the microprocessor necessary to run eCos. The current implementation provides accurate simulation of the instruction set, interrupt controller, timers, and serial I/O.

In this release, you can run the same eCos binaries in the simulator that can run on target hardware, if built for

ROM start-up, with the exception of those that use the watchdog timer.

However, note that AM33 devices required to run eCos are not simulated; therefore you cannot run eCos binaries built for the AM33 under the simulator. For the AM33, the simulator is effectively an instruction-set only simulator.

To simplify connection to the simulator, you are advised to create a GDB macro by putting the following code in your personal GDB start-up file (gdb.ini on Windows and .gdbinit on UNIX).

define msim target sim --board=stdeval1 --memory-region 0x34004000,0x8 rbreak cyg_test_exit rbreak cyg_assert_fail end

You can then connect to the simulator by invoking the command msim on the command line:

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Appendix A. Target Setup

(gdb) msim

You can achieve the same effect by typing out the macro’s content on the command line if necessary.

AM33 STB Hardware Setup

The Matsushita AM33 STB System Reference Board may be used in two modes: via a JTAG debugger, or by means of a GDB stub ROM.

Use with GDB Stub ROM

The eCos Developer’s Kit package comes with a ROM image which provides GDB support for the Matsushita(R) AM33 STB System Reference Board. To install the GDB stub ROM requires the use of the JTAG debugger and the Flash ROM programming code available from Matsushita. An image of this ROM is also provided at loaders/am33-stb/gdbload.bin

under the root of your eCos installation.

Ensure that there is a Flash ROM card in MAIN MEMORY SLOT <0>. Follow the directions for programming a Flash ROM supplied with the programming software.

The final programming of the ROM will need to be done with a command similar to the following: fdown "gdbload.bin",0x80000000,16,1

Once the ROM has been programmed, close down the JTAG debugger, turn the STB off, and disconnect the

JTAG cable. Ensure that the hardware switches are in the following configuration:

U U D D D U D D

D = lower part of rocker switch pushed in

U = upper part of rocker switch pushed in

This is also the configuration required by the Flash programming code, so it should not be necessary to change these.

Restart the STB and the stub ROM will now be able to communicate with GDB. eCos programs should be built with RAM startup.

Programs can then be downloaded via a standard RS232 null modem serial cable connected to the SERIAL1 connector on the STB front panel (the AM33"s serial port 0). This line is programmed to run at 38400 baud,

8 data bits, no parity and 1 stop bit (8-N-1) with no flow control. A gender changer may also be required.

Diagnostic output will be output to GDB using the same connection.

This procedure also applies for programming ROM startup eCos programs into ROM, given a binary format image of the program from mn10300-elf-objcopy.

Use with the JTAG debugger

To use eCos from the JTAG debugger, executables must be built with ROM startup and then downloaded via the JTAG debugger. For this to work there must be an SDRAM memory card in SUB MEMORY SLOT <0> and the hardware switches on the front panel set to the following:

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Appendix A. Target Setup

D U D D D U D D

D = lower part of rocker switch pushed in

U = upper part of rocker switch pushed in

Connect the JTAG unit and run the debugger as described in the documentation that comes with it.

eCos executables should be renamed to have a “.out” extension and may then be loaded using the debugger"s

“l” or “lp” commands.

Diagnostic output generated by the program will be sent out of the AM33"s serial port 0 which is connected to the SERIAL1 connector on the STB front panel. This line is programmed to run at 38400 baud, 8 data bits, no parity, and one stop bit (8-N-1) with no flow control. Connection to the host computer should be using a standard RS232 null modem serial cable. A gender changer may also be required.

Building the GDB stub ROM image

eCos comes with a pre-built GDB stub ROM image for the AM33-STB platform. This can be found at loaders/am33-stb/gdbload.bin

relative to the eCos installation directory.

If necessary, the ROM image can be re-built as follows:

1. On Windows hosts, open a Bash session using Start->Programs->Red Hat eCos->eCos Development

Environment

2. Create a build directory and cd into it

3. Run (all as one line): cygtclsh80 BASE_DIR/packages/pkgconf.tcl

--target=mn10300_am33 --platform stb --startup rom

--disable-kernel --disable-uitron --disable-libc --disable-libm \

--disable-io --disable-io_serial --disable-wallclock

--disable-watchdog where BASE_DIR is the path to the eCos installation directory.

4. Edit the configuration file pkgconf/hal.h

in the build directory tree by ensuring the following configuration options are set as follows:

#define CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS

#define CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT

#undef CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT

#define CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT

#define CYG_HAL_ROM_MONITOR

5. Run: make

6. Run: make -C hal/common/current/current/src/stubrom

7. The file hal/common/current/src/stubrom will be an ELF format executable of the ROM image. Use mn10300-elf-objcopy to convert this to the appropriate format for loading into the Matsushita FLASH

ROM programmer, mode “binary” in this case:

$ mn10300-elf-objcopy -O binary hal/common/current/src/stubrom/ \ stubrom stubrom.img

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Appendix A. Target Setup

TX39 Hardware Setup

The eCos Developer’s Kit package comes with a pair of ROMs that provide GDB support for the Toshiba

JMR-TX3904 RISC processor reference board by way of CygMon.

Images of these ROMs are also provided at

BASE_DIR/loaders/tx39-jmr3904/cygmon50.bin

and

BASE_DIR/loaders/tx39-jmr3904/cygmon66.bin

for 50 MHz and 66 MHz boards respectively. The

ROMs are installed to sockets IC6 and IC7 on the memory daughterboard according to their labels. Attention should be paid to the correct orientation of these ROMs during installation.

The GDB stub allows communication with GDB using the serial port (channel C) at connector PJ1. The communication parameters are fixed at 38400 baud, 8 data bits, no parity bit, and 1 stop bit (8-N-1). No handshaking is employed. Connection to the host computer should be made using an RS232C null modem cable.

CygMon and eCos currently provide support for a 16Mbyte 60ns 72pin DRAM SIMM fitted to the PJ21 connector. Different size DRAMs may require changes in the value stored in the DCCR0 register. This value may be found near line 211 in hal/mips/arch/<version>/src/vectors.S

in eCos, and near line 99 in libstub/mips/tx39jmr/tx39jmr-power.S

in CygMon. eCos does not currently use the DRAM for any purpose itself, so it is entirely available for application use.

TX39 Architectural Simulator Setup

The TX39 simulator is an architectural simulator which implements all the features of the Toshiba TX39 needed to run eCos. The current implementation provides accurate simulation of the instruction set, interrupt controller, and timers, as well as having generic support for diagnostic output, serial I/O, and exceptions.

In this release, you can run the same eCos binaries in the simulator that can run on target hardware, if it is built for ROM start-up.

To simplify connection to the simulator, you are advised to create a GDB macro by putting the following code in your personal GDB start-up file (gdb.ini on Windows and .gdbinit on UNIX).

define tsim target sim --board=jmr3904pal --memory-region 0xffff8000,0x900 \

--memory-region 0xffffe000,0x4 \

--memory-region 0xb2100000,0x4 rbreak cyg_test_exit rbreak cyg_assert_fail end

You can then connect to the simulator by invoking the command tsim on the command line:

(gdb) tsim

You can achieve the same effect by typing out the macro’s content on the command line if necessary.

TX49 Hardware Setup

The eCos installation CD contains a copy of the eCos GDB stubs in SREC format which must be programmed into the board’s FLASH memory.

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Appendix A. Target Setup

Preparing the GDB stubs

These stub preparation steps are not strictly necessary as the eCos distribution ships with pre-compiled stubs in the directory loaders/tx49-ref4955 relative to the installation root.

Building the GDB stub image with the eCos Configuration Tool

1. Start with a new document - selecting the File->New menu item if necessary to do this.

2. Choose the Build->Templates menu item, and then select the TX49 REF4955 hardware.

3. While still displaying the Build->Templates dialog box, select the stubs package template to build a GDB stub. Click OK.

4. Build eCos stubs using Build->Library.

5. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub images have the prefix gdb_module.

Building the GDB stub image with ecosconfig

1. Make an empty directory to contain the build tree, and cd into it.

2. To build a GDB stub ROM image, enter the command:

$ ecosconfig new ref4955 stubs

3. Enter the commands:

$ ecosconfig tree

$ make

4. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub images have the prefix gdb_module.

Installing GDB stubs into FLASH

Boot into the board’s firmware in little-endian mode:

Set the switches like this:

SW1: 10000000 (first lever up, the rest down) SW2: 10000010

Connect serial cable on the lower connector, configure terminal emulator for 38400, 8-N-1.

When booting the board, you should get this prompt:

HCP5 rev 0.9B .

HCP5?

Select o (option), a (FLASH) and b (boot write). You should see this:

Boot ROM Write

ROM address-ffffffffbd000000, Boot Bus-[32bit]

ID2 0 4 ffffffffa002ad40

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Appendix A. Target Setup zzz SS-40000 IV-1 CS-20000 CC-2

Flash ROM-[28F640J5], [16bit chip] * 2 * 1

Block size-00040000 count-64

ROM adr ffffffffbd000000-ffffffffbe000000 mask-00fc0000

Send Srecord file sa=00000000 size=ffffffffffffffff ra=fffffffffe000000

Now send the stub SREC data down to the board using the terminal emulator’s ‘send ASCII’ (or similar) functionality.

Red Hat has experienced some sensitivity to how fast the data is written to the board. Under Windows you should configure Minicom to use a line delay of 100 milliseconds. Under Linux, use the slow_cat.tcl script:

% cd BASE_DIR/packages/hal/mips/ref4955/<version>/misc

% slow_cat.tcl

< [path]/gdb_module.srec > /dev/ttyS0

Power off the board, and change it to boot the GDB stubs in big-endian mode by setting the switches like this:

SW1: 00000000 (all levers down) SW2: 10001010

The GDB stubs allow communication with GDB using the serial port at connector PJ7A (lower connector).

The communication parameters are fixed at 38400 baud, 8 data bits, no parity bit and 1 stop bit (8-N-1). No flow control is employed. Connection to the host computer should be made using a straight through serial cable.

VR4300 Hardware Setup

The eCos Developer’s Kit package comes with an EPROM which provides GDB support for the NEC VRC4373 evaluation board.

An image of this EPROM is also provided at loaders/vr4300-vrc4373/gdbload.bin

under the root of your eCos installation.

The EPROM is installed to socket U12 on the board. Attention should be paid to the correct orientation of the

EPROM during installation. Only replace the board"s existing ROM using a proper PLCC extraction tool, as the socket would otherwise risk getting damaged.

The GDB stub in the EPROM allows communication with GDB using the serial port at connector J1. The communication parameters are fixed at 38400 baud, 8 data bits, no parity bit and 1 stop bit (8-N-1). No flow control is employed. Connection to the host computer should be made using a straight-through serial cable.

VRC4375 Hardware Setup

For information about setting up the VRC4375 to run with RedBoot, consult the RedBoot User"s Guide. If using serial debugging, the serial line runs at 38400 baud 8-N-1 and should be connected to the debug host using the cable supplied with the board.

Atlas/Malta Hardware Setup

For information about setting up the Atlas and Malta boards to run with RedBoot, consult the RedBoot User"s

Guide.

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Appendix A. Target Setup

PowerPC Cogent Hardware Setup

The eCos Developer’s Kit package comes with an EPROM which provides GDB support for the Cogent evaluation board. An image of this EPROM is also provided at loaders/powerpc-cogent/gdbload.bin

under the root of your eCos installation. The same EPROM and image can be used on all three supported daughterboards:

CMA287-23 (MPC823), CMA287-50 (MPC850), and CMA286-60 (MPC860).

The EPROM is installed to socket U4 on the board. Attention should be paid to the correct orientation of the

EPROM during installation.

If you are going to burn a new EPROM using the binary image, be careful to get the byte order correct. It needs to be big-endian. If the EPROM burner software has a hex-editor, check that the first few bytes of the image look like:

00000000: 3c60 fff0 6063 2000 7c68 03a6 4e80 0020 < `..`c.|h..N..

If the byte order is wrong you will see 603c instead of 3c60 etc. Use the EPROM burner software to make a byte-swap before you burn to image to the EPROM.

If the GDB stub EPROM you burn does not work, try reversing the byte-order, even if you think you have it the right way around. At least one DOS-based EPROM burner program is known to have the byte-order upside down.

The GDB stub in the EPROM allows communication with GDB using the serial port at connector P12

(CMA101) or P3 (CMA102). The communication parameters are fixed at 38400 baud, 8 data bits, no parity bit and 1 stop bit (8-N-1). No flow control is employed. Connection to the host computer should be made using a dedicated serial cable as specified in the Cogent CMA manual.

Installing the Stubs into ROM

Preparing the Binaries

These two binary preparation steps are not strictly necessary as the eCos distribution ships with pre-compiled binaries in the directory loaders/powerpc-cogent relative to the installation root.

Building the ROM images with the eCos Configuration Tool

1. Start with a new document - selecting the File->New menu item if necessary to do this.

2. Choose the Build->Templates menu item, and then select the PowerPC CMA28x hardware.

3. While still displaying the Build->Templates dialog box, select the “stubs” package template to build a

GDB stub. Click OK.

4. Build eCos using Build->Library.

5. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub ROM images have the prefix “gdb_module”.

Building the ROM images with ecosconfig

1. Make an empty directory to contain the build tree, and cd into it.

2. To build a GDB stub ROM image, enter the command:

$ ecosconfig new cma28x stubs

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Appendix A. Target Setup

3. Enter the commands:

$ ecosconfig tree

$ make

4. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub ROM images have the prefix “gdb_module”.

Installing the Stubs into ROM or FLASH

1. Program the binary image file gdb_module.bin into ROM or FLASH referring to the instructions of your

ROM programmer.

2. Plug the ROM/FLASH into socket U4 as described at the beginning of this Hardware Setup section.

PowerPC MBX860 Hardware Setup

The eCos Developer’s Kit package comes with an EPROM which provides GDB support for the Motorola PowerPC MBX860 evaluation board. An image of this EPROM is also provided at loaders/powerpc-mbx/gdbload.bin

under the root of your eCos installation.

The EPROM is installed to socket XU1 on the board. Attention should be paid to the correct orientation of the

EPROM during installation. Only replace the board"s existing ROM using a proper PLCC extraction tool, as the socket would otherwise risk getting damaged.

The GDB stub in the EPROM allows communication with GDB using the serial port at connector

SMC1/COM1. The communication parameters are fixed at 38400 baud, 8 data bits, no parity bit and 1 stop bit (8-N-1). No flow control is employed. Connection to the host computer should be made using a suitable serial cable.

In order to make the board execute the EPROM that you just installed (rather than the on-board FLASH memory), it may be necessary move some links on the board. Specifically, ensure that link J4 is in position

1-2. If in doubt, refer to the MBX documentation from Motorola, ensuring that Boot Port Size=8 Bits/ROM for BOOT (CS#7), in their terminology.

Installing the Stubs into FLASH

Preparing the Binaries

These two binary preparation steps are not strictly necessary as the eCos distribution ships with pre-compiled binaries in the directory loaders/powerpc-mbx relative to the installation root.

Building the ROM images with the eCos Configuration Tool

1. Start with a new document - selecting the File->New menu item if necessary to do this.

2. Choose the Build->Templates menu item, and then select the PowerPC Motorola MBX860/821 hardware.

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Appendix A. Target Setup

3. While still displaying the Build->Templates dialog box, select the “stubs” package template to build a

GDB stub. Click OK.

4. Build eCos using Build->Library.

5. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub ROM images have the prefix “gdb_module”.

Building the ROM images with ecosconfig

1. Make an empty directory to contain the build tree, and cd into it.

2. To build a GDB stub ROM image, enter the command:

$ ecosconfig new mbx stubs

3. Enter the commands:

$ ecosconfig tree

$ make

4. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub ROM images have the prefix “gdb_module”.

Installing the Stubs into ROM

1. Program the binary image file gdb_module.bin into ROM or FLASH referring to the instructions of your

ROM programmer.

2. Plug the ROM/FLASH into socket XU1 as described near the beginning of this Hardware Setup section.

Installing the Stubs into FLASH

This assumes you have EPPC-Bug in the on-board FLASH. This can be determined by setting up the board according to the below instructions and powering up the board. The EPPC-Bug prompt should appear on the

SMC1 connector at 9600 baud, 8N1.

1. Set jumper 3 to 2-3 [allow XU2 FLASH to be programmed]

2. Set jumper 4 to 2-3 [boot EPPC-Bug]

Program FLASH

1. Prepare EPPC-Bug for download:

EPPC-Bug>lo 0

At this point the monitor is ready for input. It will not return the prompt until the file has been downloaded.

2. Use the terminal emulator’s ASCII download feature (or a simple clipboard copy/paste operation) to download the gdb_module.srec data. Note that on Linux, Minicom’s ASCII download feature seems to be broken. A workaround is to load the file into Emacs (or another editor) and copy the full contents to the clipboard. Then press the mouse paste-button (usually the middle one) over the Minicom window.

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Appendix A. Target Setup

3. Program the FLASH with the downloaded data:

EPPC-Bug>pflash 40000 60000 fc000000

4. Switch off the power, and change jumper 4 to 1-2. Turn on the power again. The board should now boot using the newly programmed stubs.

PowerPC Architectural Simulator Setup

The PowerPC simulator is an architectural simulator which implements all the features of the PowerPC needed to run eCos. The current implementation provides accurate simulation of the instruction set and timers, as well as having generic support for diagnostic output and exceptions.

The simulator also allows devices to be simulated, but no device simulation support has been defined for the serial device drivers in this release.

To simplify connection to the simulator, you are advised to create a GDB macro by putting the following code in your personal GDB start-up file (gdb.ini on Windows and .gdbinit on UNIX).

define psim target sim -o ’/iobus/pal@0xf0001000/reg 0xf0001000 32’ rbreak cyg_test_exit rbreak cyg_assert_fail end

You can then connect to the simulator by invoking the command psim on the command line:

(gdb) psim

You can achieve the same effect by typing out the macro’s content on the command line if necessary.

Note: The PowerPC simulator cannot execute binaries built for any of the supported hardware targets. You must generate a configuration using the PowerPC simulator platform:

$ ecosconfig new psim or some such.

SPARClite Hardware Setup

The eCos Developer’s Kit package comes with a ROM which provides GDB support for the Fujitsu SPARClite

Evaluation Board by way of CygMon.

An image of this ROM is also provided at BASE_DIR/loaders/sparclite-sleb/cygmon.bin.

The ROM is installed in socket IC9 on the evaluation board. Attention should be paid to the correct orientation of the ROM during installation.

The GDB stub allows communication with GDB using a TCP channel via the ethernet port at connector J5.

121

Ethernet Setup

The ethernet setup is described in the board’s manual, but here is a recapitulation.

Set the board’s ethernet address using SW1 on the motherboard:

SW1-4 SW1-3 SW1-2 SW1-1

----- ----- ----- -----

OFF OFF OFF OFF

OFF OFF OFF ON

OFF OFF

OFF

OFF OFF

OFF

OFF OFF

OFF ON

ON OFF

ON ON

OFF

Ethernet Address

----------------

No ethernet, use serial

00:00:0E:31:00:01

00:00:0E:31:00:02

00:00:0E:31:00:03

00:00:0E:31:00:04

00:00:0E:31:00:05

00:00:0E:31:00:06

00:00:0E:31:00:07

00:00:0E:31:00:08

00:00:0E:31:00:09

00:00:0E:31:00:0A

00:00:0E:31:00:0B

00:00:0E:31:00:0C

00:00:0E:31:00:0D

00:00:0E:31:00:0E

00:00:0E:31:00:0F

Appendix A. Target Setup

BOOTP/DHCP service on Linux

Configure the BOOTP or DHCP server on the network to recognize the evaluation board’s ethernet address so it can assign the board an IP address. Below is a sample DHCP server configuration from a Linux system

( /etc/dhcpd.conf

). It shows a setup for three evaluation boards.

# DHCP server configuration.

# allow bootp; subnet 192.168.1.0 netmask 255.255.255.0 { host mb831evb { hardware ethernet 00:00:0e:31:00:01; fixed-address mb831evb;

} host mb832evb { hardware ethernet 00:00:0e:31:00:02; fixed-address mb832evb;

} host mb833evb { hardware ethernet 00:00:0e:31:00:03; fixed-address mb833evb;

}

BOOTP/DHCP boot process

Even when configured to use a TCP channel, CygMon will still print a boot message to the serial channel. If the

BOOTP process was successful and an IP address was found, a message “BOOTP found xxx.xxx.xxx.xxx” will be printed where xxx.xxx.xxx.xxx is the IP address assigned by the BOOTP or DHCP server. If the BOOTP process fails, a message indicating failure will be printed and the serial port will be used as the debug channel.

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Appendix A. Target Setup

Once the board finds an IP address it will respond to ICMP echo request packets (ping). This gives a simple means to test the health of the board.

As described in “Ethernet Setup” on page 72, it should now be possible to connect to the SPARClite board from within GDB by using the command:

(gdb) target remote < host>:1000

Serial Setup

The CygMon stubs also allow communication with GDB by way of the serial port at connector CON1. The communication parameters are fixed at 19200 baud, 8 data bits, no parity bit and 1 stop bit (8-N-1). No flow control is employed. Connection to the host computer should be made using a null modem cable. A gender changer may also be required.

SPARClite Architectural Simulator Setup

The ESA SPARClite simulator is an architectural simulator which implements all the features of the SPARClite needed to run eCos. The current implementation provides accurate simulation of the instruction set, interrupt controller, and timers, as well as having generic support for diagnostic output and exceptions.

Note that the ESA SPARClite simulator is unsupported, but is included in the release as a convenience.

To simplify connection to the simulator, you are advised to create a GDB macro by putting the following code in your personal GDB start-up file (gdb.ini on Windows and .gdbinit on UNIX).

define ssim target sim -nfp -sparclite -dumbio rbreak cyg_test_exit rbreak cyg_assert_fail end

You can then connect to the simulator by invoking the command ssim on the command line:

(gdb) ssim

You can achieve the same effect by typing out the macro’s content on the command line if necessary.

ARM PID Hardware Setup

eCos comes with two ROM images that provide GDB support for the ARM PID board. The first ROM image provides a port of the CygMon ROM monitor, which includes a command-line interface and a GDB remote stub. The second ROM image provides a remote GDB stub only, which is a minimal environment for downloading and debugging eCos programs solely using GDB.

eCos, CygMon and the GDB stubs all support the PID fitted with both ARM7T and ARM9 daughterboards.

CygMon and the stubs can be programmed into either the programmable ROM (U12) or the FLASH (U13).

Pre-built forms of both ROM images are provided in the directory loaders/arm-pid under the root of your eCos installation, along with a tool that will program the stubs into the FLASH memory on the board. CygMon images are prefixed with the name ’cygmon’ and GDB stub ROM images are given the prefix ’gdb_module’.

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Appendix A. Target Setup

Images may be provided in a number of formats including ELF (.img extension), binary (.bin extension) and

SREC (.srec extension). Note that some unreliability has been experienced in downloading files using Angel

1.00. Angel 1.02 appears to be more robust in this application.

Installing the Stubs into FLASH

Preparing the Binaries

These two binary preparation steps are not strictly necessary as the eCos distribution ships with pre-compiled binaries in the directory loaders/arm-pid relative to the installation root.

Building the ROM images with the eCos Configuration Tool

1. Start with a new document - selecting the File->New menu item if necessary to do this.

2. Choose the Build -> Templates menu item, and then select the ARM PID hardware.

3. While still displaying the Build -> Templates dialog box, select either the "stubs" package template to build a GDB stub image, or the "cygmon" template to build the CygMon ROM Monitor. Click OK.

4. Build eCos using Build -> Library

5. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub ROM images have the prefix "gdb_module". CygMon images have the prefix "cygmon".

Building the ROM images with ecosconfig

1. Make an empty directory to contain the build tree, and cd into it.

2. To build a GDB stub ROM image, enter the command:

$ ecosconfig new pid stubs or to build a CygMon ROM monitor image, enter the command:

$ ecosconfig new pid cygmon

3. Enter the commands:

$ ecosconfig tree

$ make

4. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub ROM images have the prefix "gdb_module". CygMon images have the prefix "cygmon".

Building the FLASH Tool with the eCos Configuration Tool

1. Start with a new document - selecting the File->New menu item if necessary to do this.

2. Choose the Build->Templates menu item, and then select the ARM PID hardware.

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Appendix A. Target Setup

3. Enable the "Build flash programming tool" option in the ARM PID HAL

(CYGBLD_BUILD_FLASH_TOOL) and resolve any resulting configuration conflicts.

4. Build eCos using Build -> Library

5. When the build completes, the FLASH tool image file can be found in the bin/ subdirectory of the install tree, with the prefix "prog_flash"

Building the FLASH Tool with ecosconfig

1. Make an empty directory to contain the build tree, and cd into it

2. Enter the command:

$ ecosconfig new pid

3. Edit the file ecos.ecc and enable the option CYGBLD_BUILD_FLASH_TOOL by uncommenting its user_value property and setting it to 1.

4. Enter the commands:

$ ecosconfig resolve

[there will be some output]

$ ecosconfig tree

$ make

5. When the build completes, the FLASH tool image file can be found in the bin/ subdirectory of the install tree, with the prefix "prog_flash"

Prepare the Board for FLASH Programming

Each time a new image is to be programmed in the FLASH, the jumpers on the board must be set to allow

Angel to run:

1. Set jumper 7-8 on LK6 [using the Angel code in the 16 bit EPROM]

2. Set jumper 5-6 on LK6 [select 8bit ROM mode]

3. Set jumper LK18 [ROM remap - this is also required for eCos]

4. Set S1 to 0-0-1-1 [20MHz operation]

5. Open jumper LK4 [enable little-endian operation] Attach a serial cable from Serial A on the PID board to connector 1 on the development system. This is the cable through which the binaries will be downloaded.

Attach a serial cable from Serial B on the PID board to connector 2 on the development system (or any system that will work as a terminal). Through this cable, the FLASH tool will write its instructions (at

38400 baud).

Program the FLASH

1. Download the FLASH ROM image onto the PID board. For example. for the GDB stubs image: bash$ arm-elf-gdb -nw gdb_module.img

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Appendix A. Target Setup

GNU gdb 4.18-DEVTOOLSVERSION

GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions.

There is absolutely no warranty for GDB. Type "show warranty" for details.

This GDB was configured as "--host=i586-pc-cygwin32 --target=arm-elf".

(no debugging symbols found)...

(gdb) target rdi s=com1

Angel Debug Monitor for PID (Built with Serial(x1), Parallel, DCC) 1.00

(Advanced RISC Machines SDT 2.10)

Angel Debug Monitor rebuilt on Jan 20 1997 at 02:33:43

Connected to ARM RDI target.

(gdb) load

Loading section .rom_vectors, size 0x44 lma 0x60000

Loading section .text, size 0x1f3c lma 0x60044

Loading section .rodata, size 0x2c lma 0x61f80

Loading section .data, size 0x124 lma 0x61fac

Start address 0x60044 , load size 8400

Transfer rate: 5169 bits/sec.

(gdb) q

The program is running.

Exit anyway? (y or n) y

Note: On a UNIX or Linux system, the serial port must be /dev/ttyS0 instead of COM1. You need to make sure that the /dev/ttyS0 files have the right permissions:

$ su

Password:

# chmod o+rw /dev/ttyS0*

# exit

If you are programming the GDB stub image, it will now be located at 0x60000..0x64000. If you are programming the Cygmon ROM Monitor, it will be located at 0x60000..0x80000.

2. Now download the FLASH programmer tool bash$ arm-elf-gdb prog_flash.img

GNU gdb 4.18-DEVTOOLSVERSION

GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB.

Type "show warranty" for details.

This GDB was configured as "--host=i586-pc-cygwin32 --target=arm-elf".

(gdb) target rdi s=com1

Angel Debug Monitor for PID (Built with Serial(x1), Parallel, DCC) 1.00

(Advanced RISC Machines SDT 2.10)

Angel Debug Monitor rebuilt on Jan 20 1997 at 02:33:43

Connected to ARM RDI target.

(gdb) load

Loading section .rom_vectors, size 0x44 lma 0x40000

Loading section .text, size 0x44a4 lma 0x40044

Loading section .rodata, size 0x318 lma 0x444e8

Loading section .data, size 0x1c8 lma 0x44800

Start address 0x40044 , load size 18888

Transfer rate: 5596 bits/sec.

(gdb) c

126

3. The FLASH tool will output some text on the board serial port B at 38400 baud:

ARM eCos

FLASH here!

manuf: 8, device: 40

Error: Wrong Manufaturer: 08

... Please change FLASH jumper

Appendix A. Target Setup

4. This text is repeated until you remove the jumper 7-8 on LK6. Then the output will be: manuf: 1F, device: A4

AT29C040A recognised

About to program FLASH using data at 60000..64000

*** Press RESET now to abort!

5. You have about 10 seconds to abort the operation by pressing reset. After this timeout, the FLASH programming happens:

...Programming FLASH

All done!

6. Quit/kill the GDB process, which will hang.

7. Next time you reset the board, the stub will be in control, communicating on Serial A at 38400 baud.

Note: If you do not have two serial ports available on your host computer, you may still verify the FLASH programming completed successfully by quitting/killing the GDB process after running "c" in step 2 above.

Then switch the serial cable on the PID from Serial A to Serial B and run a terminal emulator on the host computer. In a few seconds you should see the the repeated text described in step 2 above and you may continue the remaining steps as normal.

Programming the FLASH for big-endian mode

The process is almost identical to the previous instructions which apply to a PID board running in little-endian mode only.

The only adjustments to make are that if programming a GDB stub ROM image (or CygMon ROM monitor image), you must enable the option "Use Big-endian mode" in the eCos Configuration Tool

(CYGHWR_HAL_ARM_BIGENDIAN if using ecosconfig and editing ecos.ecc).

When programming the FLASH there are two options:

1. Program FLASH using the little-endian FLASH tool. After powering off, replace the ROM controller with the special big-endian version which can be acquired from ARM. (This has not been tested by Red Hat).

2. Use a special big-endian version of the FLASH tool which byte-swaps all the words as they are written to the FLASH.

Build this tool by enabling the "Build flash programming tool for BE images on LE boards" option (CYG-

BLD_BUILD_FLASH_TOOL_BE), resulting in a utility with the prefix "prog_flash_BE_image_LE_system" which should be used instead of "prog_flash".

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Appendix A. Target Setup

Note that there is a limitation to this method: no sub-word data can be read from the ROM. To work around this, the .rodata section is folded into the .data section and thus copied to RAM before the system starts.

Given that Thumb instructions are 16 bit, it is not possible to run ROM-startup Thumb binaries on the PID board using this method.

When the image has been programmed, power off the board, and set jumper LK4 to enable big-endian operation.

Installing the Stubs into ROM

1. Program the binary image file gdb_module.bin into ROM referring to the instructions of your ROM programmer.

2. Plug the ROM into socket U12 and install jumper LK6 pins 7-8 to enable the ROM.

ARM AEB-1 Hardware Setup

Overview

The ARM AEB-1 comes with tools in ROM. These include a simple FLASH management tool and the Angel® monitor. eCos for the ARM AEB-1 comes with GDB stubs suitable for programming into the onboard FLASH.

GDB is the preferred debug environment for GDB, and while Angel provides a subset of the features in the eCos GDB stub, Angel is unsupported.

Both eCos and the stubs support both Revision B and Revision C of the AEB-1 board. Stub ROM images for both types of board can be found in the loaders/arm-aeb directory under the root of your eCos installation. You can select which board you are using by selecting either the aeb or aebC platform by selecting the appropriate platform HAL in the eCos Configuration Tool.

The GDB stub can be downloaded to the board for programming in the FLASH using the board’s on-board

ROM monitor:

1. talk to the AEB-1 board with a terminal emulator (or a real terminal!)

2. use the board’s rom menu to download a UU-encoded version of the GDB stubs which will act as a ROM monitor

3. tell the board to use this new monitor, and then hook GDB up to it for real debugging

Talking to the Board

Connect a terminal or computer’s serial port to the ARM AEB-1. On a PC with a 9-pin serial port, you can use the cable shipped by ARM with no modification.

Set the terminal or terminal emulator to 9600N1 (9600 baud, no parity, 1 stop bit).

Reset the board by pressing the little reset button on the top. You will see the following text:

ARM Evaluation Board Boot Monitor 0.01 (19 APR 1998)

128

Appendix A. Target Setup

Press ENTER within 2 seconds to stop autoboot

Press ENTER quickly, and you will get the boot prompt:

Boot:

Downloading the Stubs via the Rom Menu

Using the AEB-1 rom menu to download the GDB stubs from the provided ".UU" file.

Note: This is an annotated ’terminal’ session with the AEB-1 monitor:

+Boot: help

Module is BootStrap 1.00 (14 Aug 1998)

Help is available on:

Help

Kill

FlashLoad

Modules

SetEnv

GoS

FlashErase

ROMModules

UnSetEnv

Boot

UnPlug

PrintEnv

PlugIn

DownLoad

FlashWrite

Boot: download c000

Ready to download. Use ’transmit’ option on terminal emulator to download file.

... at this point, download the ASCII file "loaders/arm-aeb/ gdb_module.img.UU". The details of this operation differ depending on which terminal emulator is used. It may be necessary to enter "^D" (control+D) when the download completes to get the monitor to return to command mode.

Loaded file gdb_module.img.bin at address

0000c000, size = 19392

Activating the GDB Stubs

Commit the GDB stubs module to FLASH:

Boot: flashwrite 4018000 C000 8000

Verify that the eCos/"GDB stubs" module is now added in the list of modules in the board:

Boot: rommodules

You should see output similar to the following:

Header Base Limit

04000004 04000000 040034a8 BootStrap 1.00 (14 Aug 1998)

04003a74 04003800 04003bc0 Production Test 1.00 (13 Aug 1998)

0400e4f4 04004000 0400e60f Angel

0401c810 04018000 0401cbc0 eCos

1.02 (12 MAY 1998)

1.3

(27 Jan 2000)

GDB stubs

129

Appendix A. Target Setup

Now make the eCos/"GDB stubs" module be the default monitor:

Boot: plugin eCos

Note: Since the GDB stubs are always linked at the same address (0x4018000), the operation of writing to the FLASH and selecting the stubs as default monitor is an idempotent operation. You can download a new set of stubs following the same procedure - you do not have to unregister or delete anything.

Building the GDB Stub FLASH ROM Images

Pre-built GDB stubs images are provided in the directory loaders/arm-aeb relative to the root of your eCos installation, but here are instructions on how to rebuild them if you should ever need to.

Building the GDB Stubs with the eCos Configuration Tool

1. Start with a new document - selecting the File -> New menu item if necessary to do this.

2. Choose the Build -> Templates menu item, and then select the ARM AEB-1 hardware.

3. While still displaying the Build->Templates dialog box, select the "stubs" package template to build a

GDB stub image. Click OK.

4. If applicable, set the "AEB board revision" option to "C" from "B" depending on the board revision being used.

5. Build eCos using Build -> Library.

6. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. The

GDB stub ROM images have the prefix "gdb_module".

Building the GDB Stub ROMs with ecosconfig

1. Make an empty directory to contain the build tree, and cd into it.

2. To build a GDB stub ROM image, enter the command:

$ ecosconfig new aeb stubs

3. If applicable, edit ecos.ecc and set the AEB board revision. (CYGHWR_HAL_ARM_AEB_REVISION) from the default "B" to "C" by uncommenting the user_value property and setting it to "C".

4. Enter the commands

$ ecosconfig tree

$ make

5. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. The

GDB stub ROM images have the prefix "gdb_module".

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Appendix A. Target Setup

ARM Cogent CMA230 Hardware Setup

The eCos Developer’s Kit package comes with an EPROM which provides GDB support for the Cogent evaluation board. An image of this EPROM is also provided at loaders/arm-cma230/gdbload.bin under the root of your eCos installation.

The EPROM is installed to socket U3 on the board. Attention should be paid to the correct orientation of the

EPROM during installation.

If you are going to burn a new EPROM using the binary image, be careful to get the byte order correct. It needs to be little-endian, which is usually the default in PC based programmer software.

The GDB stub in the EPROM allows communication with GDB using the serial port at connector P12

Building the GDB Stub FLASH ROM images

Pre-built GDB stubs images are provided in the directory loaders/arm-cma230 relative to the root of your eCos installation, but here are instructions on how to rebuild them if you should ever need to.

CygMon images are prefixed with the name ’cygmon’ and GDB stub ROM images are given the prefix ’gdb_module’. Images may be provided in a number of formats including ELF (.img

extension), binary (.bin extension) and SREC (.srec extension).

Building the GDB Stubs with the eCos Configuration Tool

1. 1. Start with a new document - selecting the File->New menu item if necessary to do this.

2. Choose the Build->Templates menu item, and then select the ARM CMA230 hardware.

3. While still displaying the Build -> Templates dialog box, select the "stubs" package template to build a

GDB stub image. Click OK.

4. Build eCos using Build -> Library

5. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. The

GDB stub ROM images have the prefix "gdb_module".

Building the GDB Stub ROMs with ecosconfig

1. 1. Make an empty directory to contain the build tree, and cd into it.

2. To build a GDB stub ROM image, enter the command:

$ ecosconfig new cma230 stubs

3. Enter the commands:

131

Appendix A. Target Setup

$ ecosconfig tree

$ make

4. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. The

GDB stub ROM images have the prefix "gdb_module".

Cirrus Logic ARM EP7211 Development Board Hardware

Setup

eCos comes with two Flash ROM images that provide GDB support for the Cirrus Logic EP7211 Development Board (also known as the EDB7211).. Note that on some board revisions, the board is silk-screened as EDB7111-2. The first Flash ROM image provides a port of the CygMon ROM monitor, which includes a command-line interface and a GDB remote stub. The second Flash ROM image provides a remote GDB stub only.

Both ROM images are provided in the directory loaders/arm-edb7211 under the root of your eCos installation.

CygMon images are prefixed with the name ’edb7211_cygmon’ and are provided in a number of formats including binary (.bin extension) and SREC (.srec) extension. GDB stub ROM images are given the prefix

’edb7211_gdb_module’.

The ROM images provided for the EP7211 Development Board must be programmed into the FLASH. Please refer to the section titled "Loading the ROM image into On-Board flash" on how to program the ROM onto the board.

Both Cygmon and GDB Stub ROMS allow communication with GDB via the serial connector labelled ’UART

1’. The communication parameters are fixed at 38400 baud, 8 data bits, no parity bit and 1 stop bit (8-N-1).

No flow control is employed. Connection to the host computer should be made using a null modem cable. A gender changer may also be required. Note that the GDB Configuration tool uses the serial port identifiers 0 and 1 to identify the EB7211 serial ports UART1 and UART2 respectively.

Both eCos and the ROM images assume the core clock is generated with a 3.6864 MHz PLL input. The CPU will be configured to run at 73.728MHz.

Note: The EP7211 CPU needs a two step RESET process. After pressing the `URESET’ pushbutton, the

`WAKEUP’ pushbutton must be pressed to complete the process.

Note: When an eCos program is run on an EDB7211 board fitted with either CygMon or a GDB stub ROM, then the code in ROM loses control. This means that if you require the ability to remotely stop execution on the target, or want thread debugging capabilities, you must include GDB stub support when configuring eCos.

Building programs for programming into FLASH

If your application is to be run directly from FLASH, you must configure eCos appropriately for "ROM" startup. This can be done in the eCos Configuration Tool by setting the "Startup type" HAL option to "ROM".

If using the ecosconfig utility, set the user_value of the CYG_HAL_STARTUP option in ecos.ecc to "ROM".

When you have linked your application with eCos, you will then have an ELF executable. To convert this into a format appropriate for the Cirrus Logic FLASH download utility, or the dl_7xxx utility on Linux, you can use the utility arm-elf-objcopy, as in the following example:

132

Appendix A. Target Setup

$ arm-elf-objcopy -O binary helloworld.exe helloworld.bin

This will produce a binary format image helloworld.bin which can be downloaded into FLASH.

Building the GDB Stub FLASH ROM images

Pre-built GDB stubs images are provided in the directory loaders/arm-edb7211 relative to the root of your eCos installation, but here are instructions on how to rebuild them if you should ever need to.

CygMon images are prefixed with the name ’cygmon’ and GDB stub ROM images are given the prefix

’gdb_module’. Images may be provided in a number of formats including ELF (.img extension), binary (.bin

extension) and SREC (.srec extension).

Building the ROM images with the eCos Configuration Tool

1. Start with a new document - selecting the File->New menu item if necessary to do this.

2. Choose the Build->Templates menu item, and then select the "Cirrus Logic development board" hardware.

4. Build eCos using Build -> Library

5. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub ROM images have the prefix "gdb_module". CygMon images have the prefix "cygmon".

Building the ROM images with ecosconfig

1. Make an empty directory to contain the build tree, and cd into it.

2. To build a GDB stub ROM image, enter the command:

$ ecosconfig new edb7xxx stubs or to build a CygMon ROM monitor image, enter the command:

$ ecosconfig new edb7xxx cygmon

3. Enter the commands:

$ ecosconfig tree

$ make

4. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub ROM images have the prefix "gdb_module". CygMon images have the prefix "cygmon".

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Loading the ROM Image into On-board Flash

Program images can be written into Flash memory by means of a bootstrap program which is built into the

EDB7211. This program communicates with a support program on your host to download and program an image into the Flash memory.

Cirrus Logic provides such a program for use with Windows/DOS. eCos comes with a similar program which will run under Linux. The basic operation of both programs is the same.

1. Connect a serial line to ’UART 1’.

2. Power off the EDB7211.

3. Install jumper ’PROGRAM ENABLE’ which enables this special mode for downloading Flash images.

Note that some board revisions have this jumper labelled “BOOT ENABLE”.

4. Power on the EDB7211.

5. Execute the Flash writing program on your host. On Linux, this would be:

# dl_edb7xxx < PATH>/gdb_module.bin

where ’<PATH>’ is the path to the binary format version of the ROM image you wish to load, either as built in the previous section or the "loaders/arm-edb7211/" subdirectory of your eCos installation. The download tool defaults to 38400 baud and device /dev/ttyS1 for communication. To change these, specify them as parameters, e.g.

# dl_edb7xxx < PATH>/gdb_module.bin 9600 /dev/ttyS0

6. The download program will indicate that it is waiting for the board to come alive. At this point, press

’RESET’ and then ’WAKEUP’ switches in order. There should be some indication of progress, first of the code being downloaded, then of the programming process.

7. Upon completion of the programming, power off the EDB7211.

8. Remove the ’PROGRAM ENABLE/BOOT ENABLE’ jumper.

9. Power on the EDB7211, press ’RESET’ and ’WAKEUP’. The new ROM image should now be running on the board.

10. The GDB debugger will now be able to communicate with the board to download and debug RAM based programs. This procedure also applies for loading ROM-startup eCos programs into the on-board FLASH memory, given a binary format image of the program from arm-elf-objcopy. Loading a ROM-startup eCos program into Flash will overwrite the GDB Stub ROM/CygMon in Flash, so you would have to reload the

GDB Stub ROM/CygMon to return to normal RAM-startup program development.

Building the Flash Downloader on Linux

eCos provides a Flash download program suitable for use with the EP7211 Development Board which will run on Linux. Follow these steps to build this program. Note: at the time of the writing of these instructions, the download program is built directly within the eCos source repository since it is not configuration specific.

# cd < eCos install dir>/packages/hal/arm/edb7xxx/<version>/support

# make

(where ’# ’ is your shell prompt)

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Appendix A. Target Setup

Note: this program was adapted from the Cirrus Logic original DOS program and still contains some vestiges of that environment.

Developing eCos Programs with the ARM Multi-ICE

The EP7211 Development Board supports use of the ARM Multi-processor EmbeddedICE(tm), also known as the Multi-ICE. Full instructions on how to install and use the Multi-ICE in conjunction with GDB are provided in the "GNUPro Toolkit Reference for eCos ARM/Thumb" manual. However, the following platform-specific details should be noted.

You will need an ARM Multi-ICE Server configuration file for the EP7211 Development Board. Here is a suggested configuration file to use:

======== File "720T.cfg" ========

;Total IR length = 4

[TITLE]

Multi-ICE configuration for EP7211

[TAP 0]

ARM720T

[TAPINFO]

YES

[Timing]

Low=0

High=0

Adaptive=OFF

==================================

You must ensure that the board has the appropriate soldered connections. For the EP7211 this involves connecting TEST0 and TEST1 of the EP7211 to ground. To do this you must solder a wire from ground at JP33 to TP8 and TP9.

With respect to using multiple devices simultaneously, note that the EP7211 is not ID sensitive.

If you wish to view diagnostic output from your program that was downloaded via the Multi-ICE, you will note that by default the output on the serial line (as viewed by a terminal such as Hyperterm in Windows, or cu in Unix) is in the form of GDB packets.

To get legible output, the solution is to set the "GDB Serial port" to a different device from the "Diagnostic serial port", and you should use the Diagnostic serial port to view the diagnostic output.

Warning: The multi-ice-gdb-server will fail on startup if the board has not been both reset and awakened before running the server.

To resolve this, it is necessary to free up the connection from within the ARM Multi-ICE server itself. However when this happens, the next time you use GDB to load the program into the board, you will see lots of "Readback did not match original data" messages in the output of the multi-ice-gdb-server program. This indicates your program did not load correctly, and you should restart the multi-ice-gdb-server program, taking care to reset the board correctly before reconnecting.

As a reminder, you must specify --config-dialog to the multi-ice-gdb-server program to connect to the board correctly. If you do not, the multi-ice-gdb-server program will not be able to connect.

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Appendix A. Target Setup

Cirrus Logic ARM EP7212 Development Board Hardware

Setup

The Cirrus Logic EP7212 Development Board is almost identical to the EP7211 Development Board from a hardware setup viewpoint, and is based on the same port of eCos. Therefore the earlier documentation for the

EP7211 Development Board can be considered equivalent, but with the following changes:

• The first serial port is silk screened as "UART 1" on the EP7211 Development Board, but is silk screened as

"Serial Port 0" on the EP7212 Development Board. Similarly "UART 2" is silk screened as "Serial Port 1" on the EP7212 Development Board.

• JP2 (used to control reprogramming of the FLASH) is not silkscreened with "Boot Enable".

• To setup the EP7212 Development Board for use with the ARM Multi-ICE JTAG debugging interface unit, it is necessary to connect TEST0 and TEST1 of the EP7212 to ground. On the Development Board, this is accomplished by placing shorting blocks on JP47 and JP48. When the shorting blocks are fitted, the board can only be operated through the Multi-ICE - debugging over a serial line is not possible.

• Pre-built GDB stubs are provided in the directory loaders/arm-edb7212 relative to the root of your eCos installation

•

When rebuilding the GDB stub ROM image, change the "Cirrus Logic processor variant" option

(CYGHWR_HAL_ARM_EDB7XXX_VARIANT) from the EP7211 to the EP7212. This can be selected in the eCos Configuration Tool , or if using ecosconfig, can be set by uncommenting the user_value property of this option in ecos.ecc and setting it to "EP7212".

Cirrus Logic ARM EP7312 Development Board Hardware

Setup

The Cirrus Logic EP7312 Development Board is similar to the EP7212 Development Board from a hardware setup viewpoint, and is based on the same port of eCos.

When rebuilding the RedBoot ROM image or an eCos application, change the "Cirrus Logic processor variant" option (CYGHWR_HAL_ARM_EDB7XXX_VARIANT) from the EP7211 to the EP7312. This can be selected in the eCos Configuration Tool , or if using ecosconfig, can be set by uncommenting the user_value property of this option in ecos.ecc and setting it to "EP7312".

See the RedBoot documentation for building and installing RedBoot for this target. Only RedBoot is supported as a boot image; ROMRAM startup is recommended.

90MHz Operation

The EP7xxx targets offer a choice of clock speeds, from 18MHz to a maximum, normally, of 72MHz. These are described as kHz values 18432 36864 49152 and 73728 within the configuration tool. If you have a release which supports it, you will also see 90317 as an available option here, for 90MHz operation.

This option only applies to certain EP7312 hardware, not all EP7312 boards support it. Do not select 90MHz when building RedBoot or your eCos application unless you are absolutely sure that your board supports it.

If you do have a 90MHz board and wish to execute at 90MHz, it is in fact not necessary to build RedBoot specially, if you build your eCos application configured for 90MHz. RedBoot will run at 72MHz and your application will run at 90MHz. If you do install a 90MHz RedBoot, then you must build eCos for 90MHz or timing and baud rates on serial I/O will be wrong.

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Appendix A. Target Setup

In other words, code (either eCos app or RedBoot) built for 90MHz will “change up a gear” when it starts up; but code built for 72MHz, because it needs to run correctly on boards without the “gearbox” does not change back down, so if you mix the two, unexpected timing can result. To run a non-eCos application without any hardware initialization code at 90MHz, you must install a specially-built RedBoot.

Cirrus Logic ARM EP7209 Development Board Hardware

Setup

Note: At time of writing, no EP7209 Development Board is available, and consequently eCos has not been verified for use with the EP7209 Development Board.

The Cirrus Logic EP7209 Development Board is almost identical to the EP7212 Board in all respects, except that it is not fitted with DRAM, nor has it a DRAM controller.

The only valid configuration for the EDB7209 is ROM based. The STUBS and RAM startup modes are not available as no DRAM is fitted.

Cirrus Logic ARM CL-PS7111 Evaluation Board Hardware

Setup

The implementation of the port of eCos to the Cirrus Logic ARM CL-PS7111 Evaluation Board (also known as EB7111) is based on the EP7211 Development Board port.

For that reason, the setup required is identical to the EP7211 Development Board as described above, with the following exceptions:

• The Cygmon ROM monitor is not supported

• The ARM Multi-ICE is not supported

• Pre-built GDB stubs are provided in the directory loaders/arm-eb7111 relative to the root of your eCos installation

• If rebuilding the GDB stub ROM image, change the "Cirrus Logic processor variant" option

(CYGHWR_HAL_ARM_EDB7XXX_VARIANT) from the EP7211 to the CL_PS7111. This can be selected in the eCos Configuration Tool , or if using ecosconfig, can be set by uncommenting the user_value property of this option in ecos.ecc and setting it to "CL_PS7111"

All remote serial communication is done with the serial I/O connector

/misc

% slow_cat.tcl

< [path]/gdb_module.srec > /dev/ttyS0

Power off the board, and change it to boot the GDB stubs in big-endian mode by setting the switches like this:

SW1: 00000000 (all levers down) SW2: 10001010

The GDB stubs allow communication with GDB using the serial port at connector PJ7A (lower connector).

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Appendix A. Target Setup

StrongARM EBSA-285 Hardware Setup

The eCos Developer’s Kit package comes with a ROM image which provides GDB support for the Intel®

StrongARM® Evaluation Board EBSA-285. Both eCos and the Stub ROM image assume the clocks are:

3.6864 MHz PLL input for generating the core clock, and 50MHz osc input for external clocks. An image of this ROM is also provided at loaders/arm-ebsa285/gdbload.bin

under the root of your eCos installation.

The ROM monitor image (an eCos GDB stub) provided for the EBSA-285 board must be programmed into the flash, replacing the Angel monitor on the board. Please refer to the section titled "Loading the ROM Image into On-Board flash" on how to program the ROM onto the board.

The Stub ROM allows communication with GDB via the serial connector on the bulkhead mounting bracket

COM0. The communication parameters are fixed at 38400 baud, 8 data bits, no parity bit and 1 stop bit (8-N-1).

No flow control is employed.

Building the GDB Stub FLASH ROM images

Pre-built GDB stubs images are provided in the directory loaders/arm-ebsa285 relative to the root of your eCos installation, but here are instructions on how to rebuild them if you should ever need to.

Building the GDB Stubs with the eCos Configuration Tool

1. Start with a new document - selecting the File -> New menu item if necessary to do this.

2. Choose the Build -> Templates menu item, and then select the StrongARM EBSA285 hardware.

3. While still displaying the Build -> Templates dialog box, select the "stubs" package template to build a

GDB stub image. Click OK.

4. Build eCos using Build -> Library

5. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. The

GDB stub ROM images have the prefix "gdb_module".

Building the GDB Stub ROMs with ecosconfig

(See “Using ecosconfig on UNIX” on page 72)

1. Make an empty directory to contain the build tree, and cd into it.

2. To build a GDB stub ROM image, enter the command:

$ ecosconfig new ebsa285 stubs

3. Enter the commands:

$ ecosconfig tree

$ make

4. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. The

GDB stub ROM images have the prefix "gdb_module".

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Appendix A. Target Setup

Loading the ROM Image into On-board Flash

There are several ways to install the eCos gdb stub ROM image in the EBSA board’s flash memory. Once installed, the gdb stub ROM provides standard eCos download and debug via the EBSA board"s serial port.

The options available include the Linux based EBSA flash upgrade utility provided by Red Hat, direct writing of the flash via MultiICE (JTAG) hardware debugger, and other flash management utilities from Intel (these only support DOS, and proprietary ARM tools and image formats). Only the Red Hat flash upgrade tool is supported and tested in this release.

The flash upgrade tool requires the EBSA board to be configured as a PCI slave (rather than a master, its normal operating mode) and plugged into a Linux host computer"s PCI bus.

Configuring the board for flash loading: Follow the instructions in the EBSA-285 Reference Manual, pages

A-2 and A-3 to configure the board as an add-in card, and enable flash blank programming. Briefly: assuming the board was in the default setting to execute as a bus master ("Host Bridge") make jumper 9 (J9), move jumper 10 (J10) to external reset (PCI_RST), and move jumper 15 (J15) link 4-6-5 to connect 5-6 instead of

4-6.

Configuring the board for execution of eCos programs: Follow the instructions in the EBSA-285 Reference

Manual, pages A-2 and A-3 to configure the board as a "Host Bridge" with "Central Function". Briefly: unset

J9, move J10 to on-board reset (BRD_RST), and set J15 to make 4-6 instead of 5-6 (see page A-8 also). Plug the card into its own PCI bus, not the Linux PC used for the flash-programming process.

Building the Linux software: the Linux software sources are in directory

< BASE_DIR>/packages/hal/arm/ebsa285/v1_3/support/linux/safl_util in the eCos source repository. There are two parts to the system: a loadable kernel module and the flash utility.

The loadable kernel module is safl.o and the utility is sa_flash. To build: cd to this directory, or a copy of it.

make

This builds safl.o and sa_flash. The kernel module must be installed, and a device file created for it. Both of these operations require root permissions. Create the device file by:

% mknod /dev/safl c 10 178

Programming the flash: switch off the EBSA-285, and remove the EBSA-285 board from its PCI bus. Take appropriate anti-static precautions. Configure it for flash loading as above, halt your Linux system and turn it off. Install the EBSA-285 board in the PCI bus of the Linux system and boot it up. (Single user is good enough, assuming your image and safl_util build dir are on a local disc partition.) Change directory to the safl_util directory, then, to load the kernel module and flash an image onto the eval board (as root):

% insmod safl.o

% sa_flash < image_file>

Halt and turn off the Linux machine and remove the EBSA-285 card. Take appropriate anti-static precautions.

Configure it for execution of eCos programs as above, and plug it into its own PCI bus. Restart the Linux machine however you wish.

This information is replicated in the README file within the safl_util directory and its parents, and in the

EBSA-285 Reference Manual from Intel, appendix A "Configuration Guide". If in doubt, please refer to those documents also.

This procedure also applies for loading ROM-startup eCos programs into the on-board flash memory, given a binary format image of the program from arm-elf-objcopy. Loading a ROM-startup eCos program into flash will overwrite the StubROM in flash, so you would have to reload the StubROM to return to normal RAMstartup program development.

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Appendix A. Target Setup

Running your eCos Program Using GDB and the StubROM

Note: You must first load the StubROM image into the flash memory on the EBSA-285 board before doing this. See “Loading the ROM Image into On-board Flash”, page 93 for details.

Connect to the StubROM in the board and run your eCos program <PROGRAM> as follows:

$ arm-elf-gdb -nw < PROGRAM>

(gdb) set remotebaud 38400

(gdb) target remote < DEVICE>

Where <DEVICE> is /dev/ttyS0 or COM1: or similar, depending on your environment and how you connected your serial line to the host computer. Expect some output here, for example:

Remote debugging using /dev/ttyS0

0x410026a4 in ?? () then, to load the program

(gdb) load which will report locations and sizes of sections as they load, then begin execution using

(gdb) continue

If you have no eCos program yet, but you want to connect to the board just to verify serial communications, tell gdb "set endian little" before anything else, so that it understands the board (GDB normally infers this from information within the eCos program).

Note: When an eCos program is run on the EBSA-285 board, the GDB stub in ROM loses control. This means that if you require the ability to stop execution on the target remotely, or want thread debugging capabilities, you must include GDB stub support when configuring eCos.

Compaq iPAQ PocketPC Hardware Setup

For setting up the iPAQ to run with RedBoot, see the the RedBoot User’s Guide. Connections may be made using the Compact Flash Ethernet interface. A serial cable may be connected directly, or via the cradle. Serial communication uses the parameters 38400,8,N,1. The LCD/Touchscreen may also be used as an interface to

RedBoot and eCos applications.

Arm Industrial Module AIM 711 Hardware Setup

The Arm Industrial Module AIM 711 comes with RedBoot installed as the default boot loader.

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Appendix A. Target Setup

For developing without having a finished custom board, a starter-kit with a minimally configured board is available. It offers all the connectors needed for development, including serial device, Ethernet, power supply and an extra connector for the external bus.

Setup Hardware

Power supply

A 6V - 7.5V power supply must be connected to J2 or TB1. At J2 the inner pin is V+ and at TB1 it is pin 1.

Serial devices

The AIM 711 has 3 serial devices, which are the debug and diagnostic channel COM0 (/dev/ser0), the high performance 16550 UART COM1 (/dev/ser1) and the second internal device COM2 (/dev/ser2).

To use the debug channel, which is also the default for RedBoot, the supplied DB9-male cable must be connected to CN4. If the also available service board is used, the above connector must be disabled by setting

JP1.

COM1 is available over the RJ45 connector CN2. This device can be configured as a RS232, RS422, RS485 or TTL level

COM2 is only available with TTL level at CN5.

Ethernet

The RJ45 connector CN1 is for Ethernet.

Installing RedBoot into FLASH

Using RedBoot

In order that Redboot can overwrite itself, Redboot is built as a ROMRAM image.

Load the RedBoot binary to the next free space:

RedBoot> load -m tftp -h 192.168.1.36 -r -b 0x40000 redboot.bin

Raw file loaded 0x00040000-0x00063233, assumed entry at 0x00040000

Store it in FLASH:

RedBoot> fis create RedBoot

An image named ’RedBoot’ exists - continue (y/n)? y

... Erase from 0x02000000-0x02025000: .....................................

... Program from 0x00040000-0x00063234 at 0x02000000: ..........................

..........

... Erase from 0x021ff000-0x02200000: .

... Program from 0x007ff000-0x00800000 at 0x021ff000: .

Restart the AIM 711:

RedBoot> reset

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Appendix A. Target Setup

... Resetting.

Using JTAG

To rewrite the FLASH using JTAG the service board must be used, which includes a JTAG connector.

SH3/EDK7708 Hardware Setup

The eCos Developer’s Kit package comes with a ROM which provides GDB support for the Hitachi

EDK7708 board (a big-endian and a little-endian version). Images of these ROMs are also provided at loaders/sh-edk7708/gdbload.bin

and loaders/sh-edk7708le/gdbload.bin

under the root of your eCos installation.

The ROM is installed to socket U6 on the board. When using the big-endian ROM, jumper 9 must be set to

2-3. When using the little-endian ROM, jumper 9 must be set to 1-2. Attention should be paid to the correct orientation of the ROM during installation. Only replace the board"s existing ROM using a proper PLCC extraction tool, as the socket would otherwise risk being damaged.

If you are going to program a new ROM or FLASH using the binary image, you may have to experiment to get the right byte-order in the device. Depending on the programming software you use, it might be necessary to enable byte-swapping. If the GDB stub ROM/FLASH you program does not work, try reversing the byte-order.

Installing the Stubs into FLASH

Preparing the Binaries

These two binary preparation steps are not strictly necessary as the eCos distribution ships with pre-compiled binaries in the directory loaders/sh-edk7708 and loaders/sh-edk7708le relative to the installation root.

Building the ROM images with the eCos Configuration Tool

1. Start with a new document - selecting the File->New menu item if necessary to do this.

2. Choose the Build->Templates menu item, and then select the SH EDK7708 hardware.

3. While still displaying the Build->Templates dialog box, select the “stubs” package template to build a

GDB stub. Click OK.

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Appendix A. Target Setup

4. If building a little-endian image, disable the “Use big-endian mode” option in the SH EDK7708 HAL

(CYGHWR_HAL_SH_BIGENDIAN).

5. Build eCos using Build->Library.

6. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub ROM images have the prefix “gdb_module”.

Building the ROM images with ecosconfig

1. Make an empty directory to contain the build tree, and cd into it.

2. To build a GDB stub ROM image, enter the command:

$ ecosconfig new edk7708 stubs

3. If building a little-endian image, uncomment the user value in ecos.ecc

for

CYGHWR_HAL_SH_BIGENDIAN and change it to 0.

4. Enter the commands:

$ ecosconfig tree

$ make

5. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub ROM images have the prefix “gdb_module”.

Installing the Stubs into ROM or FLASH

1. Program the binary image file gdb_module.bin into ROM or FLASH referring to the instructions of your

ROM programmer.

2. Plug the ROM/FLASH into socket U6. If the image is little-endian set jumper 9 to 1-2. If the image is big-endian set jumper 9 to 2-3.

SH3/CQ7708 Hardware Setup

Preparing the board

Make sure the DIP switches on the board are set as follows:

SW1-1 ON

SW1-2 OFF

SW1-3 ON

SW1-4 OFF

SW2-1 ON

SW2-2 ON

SW2-3 OFF

SW2-4 OFF

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Appendix A. Target Setup

If you are using a straight through serial cable which has flow control lines, you will also need to cut JP12

(5-6) as the flow control lines can cause NMIs.

eCos GDB Stubs

The eCos installation CD contains a copy of the eCos GDB stubs in binary format which must be programmed into an EPROM or FLASH and installed on the board.

Preparing the GDB stubs

These stub preparation steps are not strictly necessary as the eCos distribution ships with pre-compiled stubs in the directory loaders/sh3-cq7708 relative to the installation root.

Building the GDB stub image with the eCos Configuration Tool

1. Start with a new document - selecting the File->New menu item if necessary to do this.

2. Choose the Build->Templates menu item, and then select the SH3 cq7708 hardware.

3. While still displaying the Build->Templates dialog box, select the stubs package template to build a GDB stub. Click OK.

4. Build eCos stubs using Build->Library.

5. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub images have the prefix gdb_module

Building the GDB stub image with ecosconfig

1. Make an empty directory to contain the build tree, and cd into it.

2. To build a GDB stub ROM image, enter the command:

$ ecosconfig new cq7708 stubs

3. Enter the commands:

$ ecosconfig tree

$ make

4. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub images have the prefix gdb_module

Programming the stubs in EPROM/FLASH

The board can use different sizes of ROMs. Use this table to adjust the board’s jumpers to the ROM sizes you are using.

size(kbit)

256

512

1000

JP7 JP9 JP10

2-3 2-3 open

1-2 2-3 open

1-2 open open

JP11 open open

2-3

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Appendix A. Target Setup

2000

4000

8000

1-2 1-2 open 2-3

1-2 1-2 short 2-3

1-2 1-2 short 1-2

There are two ways to program the stubs. We advise you to use method 1, since it is simpler. Method 2 is unsupported and requires a bit of fiddling.

Method 1:

Program the binary stub image into two EPROMs, E and O. EPROM E should contain the even bytes, and O the odd bytes (your EPROM programmer should have the ability to split the image).

EPROM E should be installed in socket IC8, and EPROM O should be installed in socket IC4.

Set JP6 to 16 bit mode (1-2 soldered, 2-3 cut) Set SW1-4 to ON and SW2-1 to OFF.

Method2:

Assuming that the stub binary is smaller than 32 KB, you can install it in a single EPROM.

Compile the mkcqrom.c

program found in the misc directory.

Use it to convert the binary image to the required format. See the mkcqrom.c

source for a description of what is done, and why it is necessary.

% mkcqrom gdb_module.bin gdb_mangled.bin

Program the gdb_mangled.bin

file into an EPROM and install it in socket IC4

Set JP6 to 8 bit mode (cut 1-2, solder 2-3)

The GDB stubs allow communication with GDB using the serial port at connector CN7. The communication parameters are fixed at 38400 baud, 8 data bits, no parity bit and 1 stop bit (8-N-1). No flow control is employed.

Connection to the host computer should be made using a straight through serial cable.

SH3/HS7729PCI Hardware Setup

Please see the RedBoot manual for instructions on how to prepare the board for use with eCos.

SH3/SE77x9 Hardware Setup

Please see the RedBoot manual for instructions on how to prepare the board for use with eCos.

SH4/CQ7750 Hardware Setup

Preparing the board

Make sure the DIP switches on the board are set as follows:

SW1-1 ON

SW1-2 OFF

SW1-3 ON

SW1-4 OFF

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Appendix A. Target Setup

SW2-1 ON

SW2-2 ON

SW2-3 OFF

SW2-4 OFF

If you are using a straight through serial cable which has flow control lines, you will also need to cut JP12

(5-6) as the flow control lines can cause NMIs.

eCos GDB Stubs

The eCos installation CD contains a copy of the eCos GDB stubs in binary format which must be programmed into an EPROM or FLASH and installed on the board.

Preparing the GDB stubs

These stub preparation steps are not strictly necessary as the eCos distribution ships with pre-compiled stubs in the directory loaders/sh3-cq7708 relative to the installation root.

Building the GDB stub image with the eCos Configuration Tool

1. Start with a new document - selecting the File->New menu item if necessary to do this.

2. Choose the Build->Templates menu item, and then select the SH3 cq7708 hardware.

3. While still displaying the Build->Templates dialog box, select the stubs package template to build a GDB stub. Click OK.

4. Build eCos stubs using Build->Library.

5. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub images have the prefix gdb_module .

Building the GDB stub image with ecosconfig

1. Make an empty directory to contain the build tree, and cd into it.

2. To build a GDB stub ROM image, enter the command:

$ ecosconfig new cq7708 stubs

3. Enter the commands:

$ ecosconfig tree

$ make

4. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub images have the prefix gdb_module .

Programming the stubs in EPROM/FLASH

The board can use different sizes of ROMs. Use this table to adjust the board’s jumpers to the ROM sizes you are using.

146

Appendix A. Target Setup size(kbit)

256

512

1000

2000

4000

8000

JP7 JP9 JP10

2-3 2-3 open

1-2 2-3 open

1-2 open open

1-2 1-2 open

JP11 open open

2-3

1-2 1-2 short 2-3

1-2 1-2 short 1-2

There are two ways to program the stubs. We advise you to use method 1, since it is simpler. Method 2 is unsupported and requires a bit of fiddling.

Method 1:

Program the binary stub image into two EPROMs, E and O. EPROM E should contain the even bytes, and O the odd bytes (your EPROM programmer should have the ability to split the image).

EPROM E should be installed in socket IC8, and EPROM O should be installed in socket IC4.

Set JP6 to 16 bit mode (1-2 soldered, 2-3 cut) Set SW1-4 to ON and SW2-1 to OFF.

Method2:

Assuming that the stub binary is smaller than 32 KB, you can install it in a single EPROM.

Compile the mkcqrom.c

program found in the misc directory.

Use it to convert the binary image to the required format. See the mkcqrom.c

source for a description of what is done, and why it is necessary.

% mkcqrom gdb_module.bin gdb_mangled.bin

Program the gdb_mangled.bin

file into an EPROM and install it in socket IC4

Set JP6 to 8 bit mode (cut 1-2, solder 2-3)

Connection to the host computer should be made using a straight through serial cable.

SH4/SE7751 Hardware Setup

Please see the RedBoot manual for instructions on how to prepare the board for use with eCos.

NEC CEB-V850/SA1 Hardware Setup

The CEB-V850 board is fitted with a socketed EPROM. The internal Flash of the V850 supplied with the CEB-V850 boards defaults to vectoring into this EPROM. A GDB stub image should be programmed into an EPROM fitted to this board, and a pre-built image is provided at loaders/v850-ceb_v850/v850sa1/gdb_module.bin

under the root of your eCos installation.

The EPROM is installed to the socket labelled U7 on the board. Attention should be paid to the correct orientation of the EPROM during installation.

When programming an EPROM using the binary image, be careful to get the byte order correct. It needs to be little-endian. If the EPROM burner software has a hex-editor, check that the first few bytes of the image look similar to:

147

Appendix A. Target Setup

00000000: 0018 8007 5e02 0000 0000 0000 0000 0000

If the byte order is wrong you will see 1800 instead of 0018 etc. Use the EPROM burner software to make a byte-swap before you burn to image to the EPROM.

The GDB stub in the EPROM allows communication with GDB using the serial port. The communication parameters are fixed at 38400 baud, 8 data bits, no parity bit and 1 stop bit (8-N-1). No flow control is employed.

Connection to the host computer should be made using a dedicated serial cable as specified in the CEB-

V850/SA1 manual.

Installing the Stubs into ROM

Preparing the Binaries

These two binary preparation steps are not strictly necessary as the eCos distribution ships with pre-compiled binaries in the directory loaders/v850-ceb_v850 relative to the installation root.

Building the ROM images with the eCos Configuration Tool

1. Start with a new document - selecting the File->New menu item if necessary to do this.

2. Choose the Build->Templates menu item, and then select the NEC CEB-V850/SA1 hardware.

3. While still displaying the Build->Templates dialog box, select the “stubs” package template to build a

GDB stub. Click OK.

4. Build eCos using Build->Library.

5. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub ROM images have the prefix “gdb_module”.

Building the ROM images with ecosconfig

1. Make an empty directory to contain the build tree, and cd into it.

2. To build a GDB stub ROM image, enter the command:

$ ecosconfig new ceb-v850 stubs

3. Enter the commands:

$ ecosconfig tree

$ make

4. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub ROM images have the prefix “gdb_module”.

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Appendix A. Target Setup

Installing the Stubs into ROM or FLASH

1. Program the binary image file gdb_module.bin into ROM or FLASH referring to the instructions of your

ROM programmer.

2. Plug the ROM/FLASH into the socket as described at the beginning of this section.

Debugging with the NEC V850 I.C.E.

eCos applications may be debugged using the NEC V850 In Circuit Emulator (I.C.E.) A PC running Microsoft

Windows is required in order to run the NEC ICE software and drivers. In addition Red Hat have developed a

“libremote” server application named v850ice.exe which is used on the PC connected to the I.C.E. in order to allow connections from GDB.

The I.C.E. must be physically connected to a Windows NT system through NEC"s PCI or PC Card interface.

A driver, DLLs, and application are provided by NEC to control the I.C.E.

v850ice is a Cygwin based server that runs on the NT system and provides an interface between the gdb client and the I.C.E. software. v850-elf-gdb may be run on the Windows NT system or on a remote system. v850elf-gdb communicates with the libremote server using the gdb remote protocol over a TCP/IP socket. v850ice communicates with the I.C.E. by calling functions in the NECMSG.DLL provided by NEC.

INITIAL SETUP

1. Configure the hardware including the I.C.E., SA1 or SB1 Option Module, and target board. Install the interface card in the Windows NT system. Reference NEC"s documentation for interface installation, jumper settings, etc.

2. Install the Windows NT device driver provided by NEC.

3. Copy the NEC DLLs, MDI application, and other support files to a directory on the Windows NT system. The standard location is C:\NecTools32. This directory will be referred to as the "libremote server directory" in this document. v850ice.exe must also be copied to this directory after being built. The required files are: cpu.cfg, Nec.cfg, MDI.EXE, NECMSG.DLL, EX85032.DLL, V850E.DLL, IE850.MON,

IE850E.MON, and D3037A.800.

4. Make certain the file cpu.cfg contains the line:

CpuOption=SA1 if using a V850/SA1 module, or:

CpuOption=SB1 if using a V850/SB1 module.

5. Set the environment variable IEPATH to point to the libremote server directory.

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Appendix A. Target Setup

BUILD PROCEDURES

A pre-built v850ice.exe executable is supplied in the loaders/v850-ceb_v850 directory relative to the root of the eCos installation. However the following process will allow the rebuilding of this executable if required:

For this example assume the v850ice libremote tree has been copied to a directory named "server". The directory structure will be similar to the following diagram: server

| config devo

/ \ libremote lib

/ \ v850ice

Build the v850ice source as follows. Be sure to use the native Cygwin compiler tools that were supplied alongside eCos.

cd server mkdir build cd build ../devo/configure --target=v850-elf --host=i686-pc-cygwin make

The resultant libremote server image (v850ice.exe) can be found in build/libremote/v850ice. Copy v850ice.exe

to the lib remote server directory.

V850ICE.EXE EXECUTION

The v850ice command line syntax is: v850ice [-d] [-t addr] [port number]

The optional -d option enables debug output. The -t option is associated with thread debugging - see the "eCos thread debugging" section below for details. By default v850ice listens on port 2345 for an attach request from a gdb client. A different port number may be specified on the command line.

To run the libremote server:

1. Power on the I.C.E. and target board.

2. Open a Cygwin window.

3. Run v850ice.

4. You will see the MDI interface window appear. In this window you should see the "Connected to In-Circuit

Emulator" message. In the Cygwin window, the libremote server will indicate it is ready to accept a gdb client connection with the message "v850ice: listening on port 2345."

V850-ELF-GDB EXECUTION

Run the v850-elf-gdb client to debug the V850 target. It is necessary to issue certain configuration commands to the I.C.E. software. These commands may be issued directly in the MDI window or they may be issued from the gdb client through the "monitor" command.

On the Cosmo CEB-V850 board, on-chip Flash is mapped at address 0x0, the on-board EPROM at 0x100000 and the on-board RAM at 0xfc0000. Since a stand alone V850 will start executing from address 0x0 on reset, it is normal to load either an application or a bootstrap loader for Flash at this address. eCos programs may be built to boot from Flash or the on-board EPROM. If building for the on-board EPROM, it would be expected

150

Appendix A. Target Setup that the Flash will contain the default CEB-V850 flash contents. An ELF format version of the default contents may be found in the eCos distribution with the name v850flash.img.

In stand alone operation, normally the code in this flash image would have been programmed into the V850 on the Cosmo board, and this would cause it to vector into the on-board EPROM to run the application located there. In the case of eCos, this application may be a GDB stub ROM application, allowing the further download to RAM over serial of actual applications to debug.

As an example, we shall demonstrate how to use the I.C.E. to download the v850flash.img and GDB stub

EPROM image using I.C.E. emulator memory only, and not requiring any actual programming of devices.

v850-elf-gdb -nw (gdb) file v850flash.img (gdb) target remote localhost:2345 (gdb) monitor reset (gdb) monitor cpu r=256 a=16 (gdb) monitor map r=0x100000-L 0x80000 (gdb) monitor map u=0xfc0000-L 0x40000

(gdb) monitor pinmask k (gdb) monitor step (gdb) monitor step (gdb) monitor step (gdb) monitor step (gdb) load (gdb) detach (gdb) file gdb_module.img (gdb) target remote localhost:2345 (gdb) load (gdb) continue

NOTE: The four "monitor step" commands are only required the first time the board is connected to the I.C.E., otherwise the program will fail.

This is because of a limitation of the I.C.E. hardware that means that the first time it is used, the "map" commands are not acted on and the addresses "0x100000" and "0xfc0000" are not mapped. This can be observed using the command "td e-20" in the MDI application"s console to display the trace buffer, which will show that the contents of address 0x100000 are not valid. Subsequent runs do not require the "monitor step" commands.

It is unusual to load two executable images to a target through gdb. From the example above notice that this is accomplished by attaching to the libremote server, loading the flash image, detaching, reattaching, and loading the ROM/RAM image. It is more normal to build an executable image that can be executed directly. In eCos this is achieved by selecting either the ROM or ROMRAM startup type, and optionally enable building for the internal FLASH. The I.C.E. emulator memory can emulate both the internal FLASH and the EPROM, so real hardware programming is not required.

Upon running this example you will notice that the libremote server does not exit upon detecting a detach request, but simply begins listening for the next attach request. To cause v850ice to terminate, issue the "monitor quit" or "monitor exit" command from the gdb client. v850ice will then terminate with the next detach request.

(You can also enter control-c in the Cygwin/DOS window where v850ice is running.)

MDI INTERFACE VS. GDB INTERFACE

If a filename is referenced in an MDI command, whether the command is entered in the MDI window or issued from the gdb client with the monitor command, the file must reside on the Windows NT libremote server system. When specifying a filename when entering a command in the MDI window it is obvious that a server local file is being referenced. When issuing an MDI command from the gdb client, the user must remember that the command line is simply passed to the I.C.E. software on the server system. The command is executed by the I.C.E. software as though it were entered locally.

Executable images may be loaded into the V850 target by entering the "load" command in the MDI window or with the gdb "load" command. If the MDI load command is used, the executable image must be located on the server system and must be in S Record format. If the gdb load command is used, the executable image must be located on the client system and must be in ELF format.

Be aware that the gdb client is not aware of debugger commands issued from the MDI window. It is possible to cause the gdb client and the I.C.E. software to get out of sync by issuing commands from both interfaces during the same debugging session.

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Appendix A. Target Setup

eCos THREAD DEBUGGING

eCos and the V850 I.C.E. libremote server have been written to work together to allow debugging of eCos threads. This is an optional feature, disabled by default because of the overheads trying to detect a threaded program involves.

Obviously thread debugging is not possible for programs with "RAM" startup type, as they are expected to operate underneath a separate ROM monitor (such as a GDB stub ROM), that itself would provide its own thread debugging capabilities over the serial line. Thread debugging is relevant only for programs built for

Flash, ROM, or ROMRAM startup.

To configure the libremote server to support thread debugging, use the command:

(gdb) monitor syscallinfo ADDRESS at the GDB console prompt, where ADDRESS is the address of the syscall information structure included in the applications. In eCos this has been designed to be located at a consistent address for each CPU model

(V850/SA1 or V850/SB1). It may be determined from an eCos executable using the following command at a cygwin bash prompt: v850-elf-nm EXECUTABLE | grep hal_v85x_ice_syscall_info

At the current time, this address is 0xfc0400 for a Cosmo board fitted with a V850/SA1, or 0xfc0540 for a

Cosmo board fitted with a V850/SB1.

So for example, the GDB command for the SB1 would be:

(gdb) monitor syscallinfo 0xfc0540

Given that the syscallinfo address is fixed over all eCos executables for a given target, it is possible to define it on the libremote command line as well using the "-t" option, for example: bash$ v850ice -t 0xfc0400 v850ice: listening on port 2345

NEC CEB-V850/SB1 Hardware Setup

The instructions for setting up the CEB-V850/SB1 are virtually identical to those of the CEB-V850/SA1 above.

The only significant differences are that pre-built loaders are available at loaders/v850-ceb_v850/v850sb1 within the eCos installation. Binaries supporting boards with both 16MHz and 8MHz clock speeds are supplied. Also when building applications, or rebuilding the stubs for a V850/SB1 target, then the V850 CPU variant must be changed in the CEB-V850 HAL to the SB1.

152

Appendix A. Target Setup

i386 PC Hardware Setup

eCos application on the PC can be run in three ways: via RedBoot, loaded directly from a floppy disk, or loaded by the GRUB bootloader.

RedBoot Support

For information about setting up the PC to run with RedBoot, consult the RedBoot User"s Guide. If using serial debugging, the serial line runs at 38400 baud 8-N-1 and should be connected to the debug host using a null modem cable. If ethernet debugging is required, an i82559 compatible network interface card, such as an Intel EtherExpress Pro 10/100, should be installed on the target PC and connected to the development PC running GDB. When RedBoot is configured appropriately to have an IP address set, then GDB will be able to debug directly over TCP/IP to the target PC.

Floppy Disk Support

If an application is built with a startup type of FLOPPY, then it is configured to be a self-booting image that must be written onto a formatted floppy disk. This will erase any existing file system or data that is already on the disk, so proceed with caution.

To write an application to floppy disk, it must first be converted to a pure binary format. This is done with the following command:

$ i386-elf-objcopy -O binary app.elf app.bin

Here app.elf

is the final linked application executable, in ELF format (it may not have a .elf

extension).

The file app.bin

is the resulting pure binary file. This must be written to the floppy disk with the following command:

$ dd conv=sync if=app.bin of=/dev/fd0

For NT Cygwin users, this can be done by first ensuring that the raw floppy device is mounted as /dev/fd0 .

To check if this is the case, type the command mount at the Cygwin bash prompt. If the floppy drive is already mounted, it will be listed as something similar to the following line:

\\.\a: /dev/fd0 user binmode

If this line is not listed, then mount the floppy drive using the command:

$ mount -f -b //./a: /dev/fd0

To actually install the boot image on the floppy, use the command:

$ dd conv=sync if=app.bin of=/dev/fd0

Insert this floppy in the A: drive of the PC to be used as a target and ensure that the BIOS is configured to boot from A: by default. On reset, the PC will boot from the floppy and the eCos application will load itself and execute immediately.

NOTE: Unreliable floppy media may cause the write to silently fail. This can be determined if the RedBoot image does not correctly boot. In such cases, the floppy should be (unconditionally) reformatted using the

fdformat command on Linux, or format a: /u on DOS/Windows. If this fails, try a different disk.

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Appendix A. Target Setup

GRUB Bootloader Support

If an application is built with the GRUB startup type, it is configured to be loaded by the GRUB bootloader.

GRUB is an open source boot loader that supports many different operating systems. It is available from http://www.gnu.org/software/grub. The latest version of GRUB should be downloaded from there and installed.

In Red Hat Linux version 7.2 and later it is the default bootloader for Linux and therefore is already installed.

To install GRUB on a floppy disk from Linux you need to execute the following commands:

$ mformat a:

$ mount /mnt/floppy

$ grub-install --root-directory=/mnt/floppy ’(fd0)’

Probing devices to guess BIOS drives. This may take a long time.

Installation finished. No error reported.

This is the contents of the device map /mnt/floppy/boot/grub/device.map.

Check if this is correct or not. If any of the lines is incorrect, fix it and re-run the script ‘grub-install’.

(fd0) /dev/fd0

$ cp $ECOS_REPOSITORY/packages/hal/i386/pc/current/misc/menu.lst /mnt/floppy/boot/grub

$ umount /mnt/floppy

The file menu.lst

is an example GRUB menu configuration file. It contains menu items to load some of the standard eCos tests from floppy or from partition zero of the first hard disk. You should, of course, customize this file to load your own application. Alternatively you can use the command-line interface of GRUB to input commands yourself.

Applications can be installed, or updated simply by copying them to the floppy disk at the location expected by the menu.lst

file. For booting from floppy disks it is recommended that the executable be stripped of all debug and symbol table information before copying. This reduces the size of the file and can make booting faster.

To install GRUB on a hard disk, refer to the GRUB documentation. Be warned, however, that if you get this wrong it may compromise any existing bootloader that exists on the hard disk and may make any other operating systems unbootable. Practice on floppy disks or sacrificial hard disks first. On machines running Red

Hat Linux version 7.2 and later, you can just add your own menu items to the

/boot/grub/menu.lst

file that already exists.

Debugging FLOPPY and GRUB Applications

When RedBoot loads an application it also provides debugging services in the form of GDB remote protocol stubs. When an application is loaded stand-alone from a floppy disk, or by GRUB, these services are not present. To allow these application to be debugged, it is possible to include GDB stubs into the application.

To do this, set the "Support for GDB stubs" (

CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS

) configuration option.

Following this any application built will allow GDB to connect to the debug serial port (by default serial device

0, also known as COM1) whenever the application takes an exception, or if a Control-C is typed to the debug port. Ethernet debugging is not supported.

The option "Enable initial breakpoint" ( CYGDBG_HAL_DEBUG_GDB_INITIAL_BREAK ) causes the HAL to take a breakpoint immediately before calling cyg_start(). This gives the developer a chance to set any breakpoints or inspect the system state before it proceeds. The configuration sets this option by default if GDB stubs are

154

Appendix A. Target Setup included, and this is not a RedBoot build. To make the application execute immediately either disable this option, or disable

CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS

i386/Linux Synthetic Target Setup

When building for the synthetic Linux target, the resulting binaries are native Linux applications with the HAL providing suitable bindings between the eCos kernel and the Linux kernel.

Note: Please be aware that the current implementation of the Linux synthetic target does not allow threadaware debugging.

These Linux applications cannot be run on a Windows system. However, it is possible to write a similar HAL emulation for the Windows kernel if such a testing target is desired.

Tools

For the synthetic target, eCos relies on features not available in native compilers earlier than gcc-2.95.1. It also requires version 2.9.5 or later of the GNU linker. If you have gcc-2.95.1 or later and ld version 2.9.5 or later, then you do not need to build new tools. eCos does not support earlier versions. You can check the compiler version using gcc -v and the linker version using ld -v.

If you have native tools that are sufficiently recent for use with eCos, you should be aware that by default eCos assumes that the tools i686-pc-linux-gnu-gcc, i686-pc-linux-gnu-ar, i686-pc-linux-gnu-ld, and i686-

pc-linux-gnu-objcopy are on your system and are the correct versions for use with eCos. But instead, you can tell eCos to use your native tools by editing the configuration value "Global command prefix" (CYG-

BLD_GLOBAL_COMMAND_PREFIX) in your eCos configuration. If left empty (i.e. set to the empty string) eCos will use your native tools when building.

If you have any difficulties, it is almost certainly easiest overall to rebuild the tools as described on: http://ecos.sourceware.org/getstart.html

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Appendix B. Real-time characterization

For a discussion of real-time performance measurement for eCos, see the kernel documentation in the eCos

Reference Manual.

Caution

As with the target setup descriptions in the previous appendix, this information will eventually be merged into per-target documents.

Sample numbers:

Board: ARM AEB-1 Revision B Evaluation Board

CPU : Sharp LH77790A 24MHz

Startup, main stack

Startup

: stack used 404 size 2400

: Interrupt stack used 128 size 2048

: Idlethread stack used 80 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 13 ’ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 193.49 microseconds (290 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

Confidence

Ave Min Max Var Ave Min Function

====== ====== ====== ====== ========== ========

110.19

104.67

116.00

3.26

42% 28% Create thread

34.00

24.67

25.05

24.67

37.14

36.67

3.81

3.33

80.00

34.00

24.67

25.33

37.33

4.00

80.00

0.00

100% 100% Yield thread [all suspended]

0.00

100% 100% Suspend [suspended] thread

0.33

0.27

57%

71%

42% Resume thread

28% Set priority

28% Get priority

0.00

100% 100% Kill [suspended] thread

33.90

33.33

45.90

44.00

24.57

24.00

42.29

36.67

34.00

46.67

24.67

43.33

0.16

0.54

0.16

1.61

85% 14% Yield [no other] thread

57% 14% Resume [suspended low prio] thread

85% 14% Resume [runnable low prio] thread

85% 14% Suspend [runnable] thread

156

33.90

33.33

24.67

34.00

24.67

80.00

43.33

80.00

43.33

106.29

101.33

107.33

144.95

141.33

166.00

78.31

76.67

254.67

4.00

16.37

16.00

16.37

16.00

16.37

16.00

16.37

16.00

4.00

16.67

10.67

28.67

30.44

30.00

25.42

25.33

22.50

22.00

5.75

5.33

10.67

28.67

31.33

26.00

22.67

6.00

185.33

20.17

20.00

2.92

2.67

32.42

32.00

3.00

2.67

32.50

32.00

2.92

2.67

32.83

32.67

31.33

27.58

27.33

32.83

32.67

26.50

26.00

28.00

3.25

2.67

26.67

28.00

3.33

3.25

2.67

30.83

30.67

3.33

31.33

101.08

100.67

101.33

20.67

3.33

32.67

3.33

32.67

3.33

33.33

32.67

31.33

28.00

33.33

11.17

10.67

24.17

24.00

27.08

26.67

22.75

22.67

22.21

22.00

7.33

11.33

24.67

27.33

23.33

22.67

7.33

5.92

5.33

6.00

110.04

110.00

110.67

9.54

3.92

4.00

9.33

3.33

4.00

30.92

30.67

5.75

5.33

10.00

4.00

31.33

6.00

13.83

13.33

46.67

3.67

3.33

45.67

45.33

8.33

8.00

36.33

36.00

14.00

46.67

4.00

46.00

8.67

36.67

Appendix B. Real-time characterization

0.16

85% 14% Yield [only low prio] thread

0.00

100% 100% Suspend [runnable->not runnable]

0.00

100% 100% Kill [runnable] thread

0.00

100% 100% Destroy [dead] thread

1.41

85% 14% Destroy [runnable] thread

6.01

2.75

85% 85% Resume [high priority] thread

99% 99% Thread switch

0.00

100% 100% Scheduler lock

0.33

56% 43% Scheduler unlock [0 threads]

0.33

56% 43% Scheduler unlock [1 suspended]

0.33

56% 43% Scheduler unlock [many suspended]

56% 43% Scheduler unlock [many low prio]

0.00

100% 100% Init mutex

0.00

100% 100% Lock [unlocked] mutex

0.33

59% 37% Unlock [locked] mutex

0.15

0.25

0.31

87%

75%

62%

87% Trylock [unlocked] mutex

25% Trylock [locked] mutex

37% Destroy mutex

0.00

100% 100% Unlock/Lock mutex

0.25

0.31

75% 75% Create mbox

62% 62% Peek [empty] mbox

0.31

62% 37% Put [first] mbox

0.33

100% 50% Peek [1 msg] mbox

0.25

75% 25% Put [second] mbox

0.31

0.25

62%

75%

62% Peek [2 msgs] mbox

75% Get [first] mbox

0.00

100% 100% Get [second] mbox

0.00

100% 100% Tryput [first] mbox

0.31

62% 62% Peek item [non-empty] mbox

0.25

75% 75% Tryget [non-empty] mbox

0.25

75% 25% Peek item [empty] mbox

0.00

100% 100% Tryget [empty] mbox

0.15

87% 12% Waiting to get mbox

0.15

0.25

0.31

87%

75%

62%

12% Waiting to put mbox

75% Delete mbox

37% Put/Get mbox

0.25

75% 25% Init semaphore

75% 75% Post [0] semaphore

0.31

0.15

62% 37% Wait [1] semaphore

87% 87% Trywait [0] semaphore

0.29

68% 68% Trywait [1] semaphore

0.00

100% 100% Peek semaphore

0.15

0.08

87% 12% Destroy semaphore

93% 93% Post/Wait semaphore

0.29

0.15

68%

87%

68% Create counter

12% Get counter value

0.00

100% 100% Set counter value

0.31

62% 62% Tick counter

62% 37% Delete counter

0.25

75% 25% Create alarm

0.00

100% 100% Initialize alarm

0.33

100% 50% Disable alarm

0.33

100% 50% Enable alarm

0.33

100% 50% Delete alarm

0.33

100% 50% Tick counter [1 alarm]

157

Appendix B. Real-time characterization

214.67

62.67

1087.04 1075.33 1278.67

246.35

240.67

412.00

168.01

167.33

237.33

187.36

168.00

234.67

187.37

167.33

235.33

303.12

280.00

508.67

0.00

100% 100% Tick counter [many alarms]

0.00

100% 100% Tick & fire counter [1 alarm]

21.91

93% 93% Tick & fire counters [>1 together]

10.35

96% 96% Tick & fire counters [>1 separately]

1.08

99% 99% Alarm latency [0 threads]

3.60

3.59

3.21

86% 1% Alarm latency [2 threads]

85% 1% Alarm latency [many threads]

98% 0% Alarm -> thread resume latency

36.65

36.00

38.67

0.00

Clock/interrupt latency

65.79

52.00

152.67

0.00

Clock DSR latency

316 316 316 (main stack:

All done, main stack

All done

752)

: stack used

Thread stack used (1120 total)

752 size 2400

: Interrupt stack used 280 size 2048

: Idlethread stack used 268 size 2048

Timing complete - 30390 ms total

PASS: < Basic timing OK>

EXIT: < done>

Board: Atmel AT91/EB40

CPU : AT91R40807 (ARM7TDMI core), 32MHz

512KB RAM, 64K Flash

Startup, main stack

Startup

: stack used 420 size 2400

: Interrupt stack used 144 size 4096

: Idlethread stack used 84 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 3 ’ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 127.53 microseconds (130 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

Ave Min Max

Confidence

Var Ave Min Function

====== ====== ====== ====== ========== ========

86.48

71.29

101.56

7.99

48% 28% Create thread

158

20.70

20.51

17.15

16.60

17.07

16.60

25.51

25.39

3.16

2.93

52.34

51.76

20.70

20.51

28.98

28.32

17.11

16.60

27.85

26.37

20.70

20.51

17.23

16.60

52.34

51.76

33.01

32.23

17.58

52.73

33.20

72.03

70.31

72.27

96.99

95.70

112.30

51.48

49.80

164.06

21.48

17.58

26.37

3.91

52.73

21.48

30.27

17.58

28.32

21.48

2.78

1.95

11.81

11.72

11.81

11.72

11.81

11.72

11.81

11.72

2.93

12.70

5.49

4.88

20.20

19.53

24.44

24.41

18.25

17.58

16.11

15.63

6.10

5.86

20.51

25.39

18.55

16.60

6.84

124.21

124.02

125.00

9.28

8.79

2.93

22.58

22.46

2.44

1.95

22.58

22.46

2.44

1.95

22.71

22.46

22.71

22.46

21.18

20.51

18.98

18.55

22.46

18.31

17.58

19.53

2.69

1.95

2.93

23.86

23.44

67.60

67.38

9.77

2.93

23.44

2.93

23.44

2.93

23.44

21.48

19.53

22.46

18.55

19.53

2.93

24.41

68.36

5.37

4.88

16.97

16.60

18.98

18.55

15.81

15.63

15.29

14.65

5.62

6.35

4.88

5.86

72.36

72.27

7.08

3.17

6.84

2.93

5.86

17.58

19.53

16.60

15.63

5.86

6.84

73.24

7.81

3.91

Appendix B. Real-time characterization

0.31

0.48

0.49

0.21

0.36

0.47

0.31

0.48

0.49

0.52

0.31

0.45

0.47

0.31

0.38

1.22

1.76

80% 80% Yield thread [all suspended]

56% 44% Suspend [suspended] thread

52% 52% Resume thread

88% 88% Set priority

76% 76% Get priority

60% 40% Kill [suspended] thread

80% 80% Yield [no other] thread

60% 36% Resume [suspended low prio] thread

52% 48% Resume [runnable low prio] thread

96% 4% Suspend [runnable] thread

80% 80% Yield [only low prio] thread

64% 36% Suspend [runnable->not runnable]

60% 40% Kill [runnable] thread

80% 20% Destroy [dead] thread

80% 4% Destroy [runnable] thread

64% 96% Resume [high priority] thread

99% 99% Thread switch

0.26

0.17

84% 15% Scheduler lock

90% 90% Scheduler unlock [0 threads]

90% 90% Scheduler unlock [1 suspended]

90% 90% Scheduler unlock [many suspended]

90% 90% Scheduler unlock [many low prio]

0.46

0.42

0.06

62% 37% Init mutex

68% 31% Lock [unlocked] mutex

96% 96% Unlock [locked] mutex

0.42

68% 31% Trylock [unlocked] mutex

0.49

100% 50% Trylock [locked] mutex

0.37

75% 75% Destroy mutex

0.30

81% 81% Unlock/Lock mutex

0.49

100% 50% Create mbox

0.00

100% 100% Peek [empty] mbox

0.21

87% 87% Put [first] mbox

0.49

100% 50% Peek [1 msg] mbox

0.21

87% 87% Put [second] mbox

0.49

100% 50% Peek [2 msgs] mbox

0.37

75% 75% Get [first] mbox

0.37

0.42

0.48

75%

68%

56%

75% Get [second] mbox

31% Tryput [first] mbox

56% Peek item [non-empty] mbox

0.00

100% 100% Tryget [non-empty] mbox

0.37

75% 25% Peek item [empty] mbox

0.00

100% 100% Tryget [empty] mbox

0.37

75% 25% Waiting to get mbox

0.00

100% 100% Waiting to put mbox

0.48

56% 56% Delete mbox

0.33

78% 78% Put/Get mbox

0.49

100% 50% Init semaphore

0.46

62% 62% Post [0] semaphore

0.48

0.30

0.44

56%

81%

65%

56% Wait [1] semaphore

81% Trywait [0] semaphore

34% Trywait [1] semaphore

0.37

75% 25% Peek semaphore

0.49

100% 50% Destroy semaphore

0.17

90% 90% Post/Wait semaphore

0.37

75% 75% Create counter

75% 75% Get counter value

159

Appendix B. Real-time characterization

3.05

2.93

24.11

23.44

5.49

4.88

3.91

24.41

5.86

10.92

10.74

31.46

31.25

3.05

2.93

31.49

31.25

11.72

32.23

3.91

32.23

7.02

6.84

31.16

30.27

7.81

31.25

309.26

304.69

425.78

44.83

43.95

44.92

781.68

774.41

893.55

324.16

320.31

433.59

114.26

113.28

167.97

126.91

113.28

159.18

127.11

113.28

158.20

196.49

189.45

331.05

23.50

23.44

25.39

0.21

0.42

0.46

87% 87% Set counter value

68% 31% Tick counter

62% 37% Delete counter

0.30

0.33

0.21

0.37

81% 81% Create alarm

78% 78% Initialize alarm

87% 87% Disable alarm

75% 75% Enable alarm

0.30

0.17

7.28

81% 81% Delete alarm

90% 9% Tick counter [1 alarm]

96% 96% Tick counter [many alarms]

0.17

90% 9% Tick & fire counter [1 alarm]

13.62

93% 93% Tick & fire counters [>1 together]

6.84

96% 96% Tick & fire counters [>1 separately]

0.84

8.20

8.09

2.10

57% 42% Alarm latency [0 threads]

50% 31% Alarm latency [2 threads]

51% 28% Alarm latency [many threads]

98% 0% Alarm -> thread resume latency

0.00

Clock/interrupt latency

40.31

33.20

514.65

0.00

Clock DSR latency

300 271 312 (main stack:

All done, main stack

All done

832)

: stack used

Thread stack used (1120 total)

832 size 2400

: Interrupt stack used 288 size 4096

: Idlethread stack used 272 size 2048

Timing complete - 30350 ms total

PASS: < Basic timing OK>

EXIT: < done>

Board: Intel StrongARM EBSA-285 Evaluation Board

CPU : Intel StrongARM SA-110 228MHz

Startup, main stack

Startup

: stack used 404 size 2400

: Interrupt stack used 136 size 4096

: Idlethread stack used 80 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 1 ’ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 4.61 microseconds (16 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

128

160

Appendix B. Real-time characterization

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

0.64

0.61

0.87

0.08

0.71

0.08

0.89

0.76

0.65

0.76

0.58

0.61

0.10

0.77

2.10

0.34

0.14

0.37

0.38

0.37

0.34

0.88

0.79

0.59

0.50

0.18

3.85

0.96

0.53

0.90

0.70

0.55

1.64

0.97

2.17

6.06

1.69

Ave Min Max

Confidence

Var Ave Min Function

====== ====== ====== ====== ========== ========

4.97

3.26

7.34

0.60

50% 4% Create thread

0.73

0.54

2.17

0.14

60% 37% Yield thread [all suspended]

0.98

0.54

0.83

0.21

2.25

0.70

0.82

0.27

0.54

0.00

1.90

0.54

2.99

1.63

1.90

0.54

10.05

1.09

0.23

0.03

0.10

0.21

0.37

0.14

81%

92%

73%

68% Suspend [suspended] thread

6% Resume thread

14% Set priority

25% 48% Get priority

96% 67% Kill [suspended] thread

53% 45% Yield [no other] thread

0.82

0.27

0.82

0.54

1.63

0.82

1.90

5.16

1.63

1.36

0.82

1.63

0.82

2.17

4.62

2.17

10.60

5.98

0.14

0.03

0.13

0.01

0.02

0.20

0.01

0.53

0.11

50% 48% Resume [suspended low prio] thread

92% 6% Resume [runnable low prio] thread

70%

98%

59%

90%

70% Suspend [runnable] thread

57% 42% Yield [only low prio] thread

98% 98% Suspend [runnable->not runnable]

98% 98% Kill [runnable] thread

98% 64% Destroy [dead] thread

1% Destroy [runnable] thread

31% Resume [high priority] thread

90% Thread switch

0.00

0.27

0.00

0.54

0.27

0.00

3.80

1.36

0.54

1.90

4.62

4.35

2.17

0.82

0.54

5.16

0.14

0.13

99% 50% Scheduler lock

62% 62% Scheduler unlock [0 threads]

60% 60% Scheduler unlock [1 suspended]

63% 63% Scheduler unlock [many suspended]

63% 63% Scheduler unlock [many low prio]

0.15

0.37

0.26

0.10

0.09

0.13

0.08

78%

93%

59%

96%

6% Init mutex

71% Lock [unlocked] mutex

93% 53% Unlock [locked] mutex

93% 3% Trylock [unlocked] mutex

78% 18% Trylock [locked] mutex

37% Destroy mutex

96% Unlock/Lock mutex

0.27

0.54

0.00

0.54

0.00

0.54

0.00

0.54

1.90

0.27

3.53

2.17

5.16

0.54

1.09

0.27

4.89

1.09

3.26

2.45

2.72

0.82

0.54

3.26

6.25

1.09

0.24

0.21

0.31

0.12

0.14

0.12

0.31

0.17

0.21

0.17

0.19

0.06

0.10

0.13

0.20

0.30

0.11

81% 15% Create mbox

68% 18% Peek [empty] mbox

59% 87% Put [first] mbox

71% 71% Peek [1 msg] mbox

56% 40% Put [second] mbox

68% 68% Peek [2 msgs] mbox

62% 81% Get [first] mbox

43% 37% Get [second] mbox

96% 50% Tryput [first] mbox

81% 81% Peek item [non-empty] mbox

53% 43% Tryget [non-empty] mbox

87% 87% Peek item [empty] mbox

75% 75% Tryget [empty] mbox

65% 65% Waiting to get mbox

65% 65% Waiting to put mbox

53% 43% Delete mbox

93% 93% Put/Get mbox

81% 81% Init semaphore

161

Appendix B. Real-time characterization

0.60

0.59

0.48

0.24

0.19

2.28

0.43

0.40

0.13

0.71

0.16

0.27

0.54

0.27

0.00

2.17

0.00

0.54

0.00

0.47

1.58

0.12

1.01

0.21

0.78

0.27

1.09

0.00

0.82

0.00

0.54

3.90

1.25

3.80

1.09

19.88

19.84

4.37

4.35

3.83

4.46

3.80

16.06

13.59

6.67

6.52

1.89

0.82

1.36

7.07

1.09

2.45

0.27

1.90

4.35

1.63

20.11

4.62

7.61

7.88

26.36

22.83

9.78

1.09

0.82

2.17

0.82

0.54

4.08

2.72

1.63

0.82

1.63

0.54

0.12

0.08

0.10

0.11

0.09

0.13

0.18

0.23

0.25

0.15

0.16

0.14

0.15

0.44

0.16

0.17

0.09

0.12

0.13

0.14

0.07

0.05

0.06

0.27

1.05

0.29

0.00

68%

81%

62%

93%

50%

53%

6% Post [0] semaphore

81% Wait [1] semaphore

96% 96% Trywait [0] semaphore

71% 25% Trywait [1] semaphore

78% 18% Peek semaphore

34% Destroy semaphore

90% Post/Wait semaphore

90% 6% Create counter

68% 28% Get counter value

96% 59% Set counter value

46% Tick counter

43% Delete counter

59% 37% Create alarm

71% 68% Initialize alarm

96% 65% Disable alarm

53% 43% Enable alarm

78% 21% Delete alarm

71% 25% Tick counter [1 alarm]

68% 68% Tick counter [many alarms]

53% 43% Tick & fire counter [1 alarm]

84% 84% Tick & fire counters [>1 together]

90% 90% Tick & fire counters [>1 separately]

99% 99% Alarm latency [0 threads]

71% 24% Alarm latency [2 threads]

54% 10% Alarm latency [many threads]

98% 98% Alarm -> thread resume latency

Clock/interrupt latency

2.17

1.09

7.34

0.00

Clock DSR latency

11 0 316 (main stack:

All done, main stack

744)

: stack used

Thread stack used (1120 total)

744 size 2400

All done : Interrupt stack used 288 size 4096

All done : Idlethread stack used 268 size 2048

Timing complete - 30210 ms total

PASS: < Basic timing OK>

EXIT: < done>

Board: Cirrus Logic EDB7111-2 Development Board

CPU : Cirrus Logic EP7211 73MHz

Board: Cirrus Logic EDB7111-2 Development Board

CPU : Cirrus Logic EP7211 73MHz

Startup, main stack

Startup

: stack used 404 size 2400

: Interrupt stack used 136 size 4096

: Idlethread stack used 88 size 2048

162

Appendix B. Real-time characterization eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 0 ’ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 356.69 microseconds (182 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

Ave Min Max Var

Confidence

Ave Min Function

====== ====== ====== ====== ========== ========

22.71

17.58

37.11

3.07

46% 34% Create thread

4.36

4.24

4.09

3.91

1.95

5.86

7.81

0.70

0.56

0.45

76%

84%

85%

76% Yield thread [all suspended]

84% Suspend [suspended] thread

3% Resume thread

5.31

2.11

11.54

4.46

7.57

3.94

3.91

1.95

9.77

3.91

5.86

1.95

11.72

3.91

25.39

9.77

13.67

5.86

0.92

0.28

0.99

0.82

0.69

0.18

65%

92%

62%

32% Set priority

92% Get priority

28% Kill [suspended] thread

75% 75% Yield [no other] thread

75% 20% Resume [suspended low prio] thread

92% 3% Resume [runnable low prio] thread

7.02

4.42

4.24

5.86

3.91

1.95

11.29

6.29

9.77

3.91

13.52

11.72

24.50

21.48

8.79

7.81

13.67

9.77

5.86

27.34

11.72

31.25

42.97

19.53

1.05

0.79

0.61

1.14

0.84

0.90

1.69

1.05

53% 45% Suspend [runnable] thread

76% 76% Yield [only low prio] thread

79% 1% Suspend [runnable->not runnable]

57% 37% Kill [runnable] thread

71% 4% Destroy [dead] thread

70% 25% Destroy [runnable] thread

79% 12% Resume [high priority] thread

99% 53% Thread switch

1.66

2.59

2.62

2.61

2.58

0.00

1.95

2.69

4.88

4.64

3.97

1.95

3.91

1.95

3.48

1.77

1.95

0.00

31.92

29.30

4.09

1.83

5.31

1.59

5.19

3.91

0.00

3.91

0.00

3.91

5.86

9.77

11.72

7.81

3.91

42.97

9.77

3.91

9.77

1.95

9.77

0.52

0.86

0.88

0.87

0.85

0.96

1.10

1.05

0.47

0.67

0.44

1.65

0.35

0.34

0.96

0.60

1.04

83% 15% Scheduler lock

67% 67% Scheduler unlock [0 threads]

65% 65% Scheduler unlock [1 suspended]

66% 66% Scheduler unlock [many suspended]

67%

65% 65% Init mutex

96% 56% Lock [unlocked] mutex

71% 71% Unlock [locked] mutex

81% 9% Trylock [unlocked] mutex

78% 21% Trylock [locked] mutex

84% 12% Destroy mutex

71% 18% Unlock/Lock mutex

96%

87%

67% Scheduler unlock [many low prio]

96% Create mbox

9% Peek [empty] mbox

62% 34% Put [first] mbox

81% 18% Peek [1 msg] mbox

56% 40% Put [second] mbox

163

Appendix B. Real-time characterization

1.65

5.43

5.31

4.76

4.82

0.00

3.91

1.95

5.55

3.97

4.33

1.59

1.71

5.25

3.91

1.95

3.91

0.00

3.91

17.82

15.63

2.69

3.78

4.27

3.72

1.95

3.91

1.95

3.29

2.32

1.89

1.95

0.00

15.75

13.67

2.69

1.83

1.53

4.82

1.89

1.95

0.00

3.91

0.00

3.91

9.77

7.81

9.77

11.72

7.81

3.91

9.77

29.30

5.86

7.81

5.86

3.91

29.30

5.86

1.95

3.91

5.86

1.95

0.96

0.46

0.62

0.66

0.92

0.59

0.24

1.07

0.62

0.86

0.96

1.07

1.15

0.82

0.59

0.69

0.79

0.53

1.01

1.14

0.96

0.23

0.76

0.97

0.12

78% 18% Peek [2 msgs] mbox

68% 28% Get [first] mbox

59% 34% Get [second] mbox

62% 62% Tryput [first] mbox

93% 3% Peek item [non-empty] mbox

71% 25% Tryget [non-empty] mbox

75% 12% Peek item [empty] mbox

81% 81% Tryget [empty] mbox

68% 25% Waiting to get mbox

81% 15% Waiting to put mbox

59% 37% Delete mbox

65% 18% Put/Get mbox

65% 65% Init semaphore

84% 12% Post [0] semaphore

84% 84% Wait [1] semaphore

75% 18% Trywait [0] semaphore

62% 34% Trywait [1] semaphore

81% 81% Peek semaphore

90% 6% Destroy semaphore

68% 21% Post/Wait semaphore

65% 65% Create counter

93% 6% Get counter value

71% 25% Set counter value

53% 53% Tick counter

96% 3% Delete counter

3.78

7.99

1.71

7.14

2.50

1.95

5.86

0.00

5.86

1.95

7.81

15.63

1.95

11.72

3.91

4.94

3.91

19.47

17.58

7.63

5.86

7.81

23.44

11.72

99.06

97.66

105.47

22.15

21.48

27.34

359.16

357.42

378.91

364.03

357.42

402.34

408.25

402.34

416.02

381.16

376.95

492.19

9.79

12.13

5.86

19.53

31.25

0.46

0.70

0.43

1.04

0.79

1.04

0.36

0.55

1.05

0.96

0.87

3.03

2.89

2.48

0.00

84% 12% Create alarm

81% 9% Initialize alarm

87% 12% Disable alarm

56% 40% Enable alarm

71% 71% Delete alarm

96% 50% Tick counter [1 alarm]

87% 9% Tick counter [many alarms]

81% 15% Tick & fire counter [1 alarm]

59% 37% Tick & fire counters [>1 together]

71% 71% Tick & fire counters [>1 separately]

71% 25% Alarm latency [0 threads]

58% 15% Alarm latency [2 threads]

53% 24% Alarm latency [many threads]

95% 46% Alarm -> thread resume latency

Clock/interrupt latency

Clock DSR latency

12 0 316 (main stack:

All done, main stack

752)

: stack used

Thread stack used (1120 total)

752 size 2400

All done

: Interrupt stack used

: Idlethread stack used

288 size

276 size

4096

2048

Timing complete - 30450 ms total

PASS: < Basic timing OK>

EXIT: < done>

164

Appendix B. Real-time characterization

CPU : Cirrus Logic EP7212 73MHz

Board: Cirrus Logic EDB7111-2 Development Board

CPU : Cirrus Logic EP7212 73MHz

Startup, main stack

Startup

: stack used 404 size 2400

: Interrupt stack used 136 size 4096

: Idlethread stack used 88 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 0 ’ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 356.32 microseconds (182 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

Confidence

Ave Min Max Var Ave Min Function

====== ====== ====== ====== ========== ========

22.43

15.63

33.20

3.02

68% 18% Create thread

4.48

4.42

4.12

5.62

2.17

11.54

3.91

1.95

3.91

1.95

9.77

5.86

7.81

5.86

11.72

3.91

27.34

0.81

0.78

0.49

0.64

0.38

0.88

70%

75%

82%

70% Yield thread [all suspended]

75% Suspend [suspended] thread

3% Resume thread

78% 18% Set priority

89% 89% Get priority

70% 25% Kill [suspended] thread

4.64

7.51

3.88

7.14

4.52

4.15

3.91

5.86

1.95

5.86

3.91

1.95

11.26

6.22

9.77

3.91

13.64

11.72

24.17

21.48

8.80

7.81

9.77

15.63

9.77

13.67

7.81

27.34

13.67

33.20

41.02

21.48

0.96

0.72

0.42

1.00

0.86

0.49

1.17

0.88

1.02

1.49

1.08

65% 65% Yield [no other] thread

76% 21% Resume [suspended low prio] thread

82%

85%

98%

10% Resume [runnable low prio] thread

59% 39% Suspend [runnable] thread

70% 70% Yield [only low prio] thread

1% Suspend [runnable->not runnable]

56% 39% Kill [runnable] thread

70% 7% Destroy [dead] thread

64% 26% Destroy [runnable] thread

82% 12% Resume [high priority] thread

54% Thread switch

1.60

2.61

2.59

2.61

2.59

2.62

4.82

0.00

1.95

3.91

1.95

3.91

9.77

0.58

0.87

0.86

0.87

0.86

0.88

1.09

82%

65%

96%

17% Scheduler lock

66% 66% Scheduler unlock [0 threads]

67% 67% Scheduler unlock [1 suspended]

66% 66% Scheduler unlock [many suspended]

67% 67% Scheduler unlock [many low prio]

65% Init mutex

59% Lock [unlocked] mutex

165

Appendix B. Real-time characterization

4.39

3.84

3.91

1.95

3.54

1.83

1.95

0.00

34.61

31.25

9.77

7.81

5.86

3.91

46.88

3.97

1.83

4.76

1.71

5.00

1.65

5.31

5.13

4.76

4.46

5.55

4.03

4.27

1.77

1.95

3.91

0.00

1.59

5.37

0.00

3.91

16.66

13.67

1.95

0.00

3.91

0.00

3.91

0.00

3.91

7.81

3.91

9.77

3.91

9.77

1.95

11.72

7.81

11.72

7.81

9.77

7.81

5.86

3.91

1.95

9.77

27.34

2.62

3.84

4.21

3.48

3.60

2.26

1.95

3.91

1.95

1.89

0.00

16.05

13.67

5.86

7.81

5.86

1.95

29.30

0.79

0.36

0.69

0.34

1.68

0.24

0.34

1.07

0.64

1.10

0.52

1.05

0.99

1.12

0.82

0.58

0.59

0.44

0.60

0.91

1.42

81%

87%

81% Unlock [locked] mutex

9% Trylock [unlocked] mutex

75% 21% Trylock [locked] mutex

87% 9% Destroy mutex

78% 9% Unlock/Lock mutex

93% 3% Create mbox

87% 9% Peek [empty] mbox

62% 62% Put [first] mbox

75% 18% Peek [1 msg] mbox

96% 50% Put [second] mbox

84% 15% Peek [2 msgs] mbox

59% 37% Get [first] mbox

56% 40% Get [second] mbox

96% 65% Tryput [first] mbox

75% 75% Peek item [non-empty] mbox

68% 25% Tryget [non-empty] mbox

78% 9% Peek item [empty] mbox

81% 81% Tryget [empty] mbox

84% 12% Waiting to get mbox

81% 18% Waiting to put mbox

65% 31% Delete mbox

90% 3% Put/Get mbox

2.38

2.01

1.89

4.58

1.71

1.95

0.00

3.91

0.00

3.91

5.86

1.95

3.84

7.99

2.01

1.95

5.86

0.00

6.53

2.32

5.86

1.95

4.76

3.91

19.53

17.58

7.81

15.63

3.91

13.67

3.91

7.81

23.44

7.57

5.86

13.67

98.57

97.66

105.47

22.15

21.48

27.34

359.18

357.42

384.77

362.63

357.42

396.48

408.22

402.34

416.02

378.63

375.00

494.14

9.78

5.86

19.53

0.92

0.47

0.53

0.76

0.62

0.53

0.12

1.40

68% 68% Init semaphore

81% 12% Post [0] semaphore

87% 87% Wait [1] semaphore

71% 25% Trywait [0] semaphore

78% 18% Trywait [1] semaphore

87% 87% Peek semaphore

96% 3% Destroy semaphore

59% 18% Post/Wait semaphore

0.67

0.35

0.24

0.88

0.43

0.36

0.47

0.35

1.01

0.59

1.01

0.24

0.75

1.14

0.96

1.10

2.55

2.73

2.56

0.00

78% 78% Create counter

84% 6% Get counter value

90%

65%

87%

6% Set counter value

65% Tick counter

12% Delete counter

87% 9% Create alarm

93% 3% Initialize alarm

84% 6% Disable alarm

75% 75% Enable alarm

81% 81% Delete alarm

59% 59% Tick counter [1 alarm]

90% 6% Tick counter [many alarms]

75% 21% Tick & fire counter [1 alarm]

96% 62% Tick & fire counters [>1 together]

71% 71% Tick & fire counters [>1 separately]

65% 31% Alarm latency [0 threads]

43% 27% Alarm latency [2 threads]

55% 21% Alarm latency [many threads]

93% 71% Alarm -> thread resume latency

Clock/interrupt latency

12.21

5.86

31.25

0.00

Clock DSR latency

12 0 316 (main stack:

All done, main stack

752)

: stack used

Thread stack used (1120 total)

752 size 2400

All done : Interrupt stack used 288 size 4096

166

Appendix B. Real-time characterization

All done : Idlethread stack used 276 size 2048

Timing complete - 30550 ms total

PASS: < Basic timing OK>

EXIT: < done>

Board: ARM PID Evaluation Board

CPU : ARM 7TDMI 20 MHz

Board: ARM PID Evaluation Board

CPU : ARM 7TDMI 20 MHz

Startup, main stack

Startup

: stack used 404 size 2400

: Interrupt stack used 136 size 4096

: Idlethread stack used 84 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 6 ’ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 120.74 microseconds (150 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

Ave Min Max Var

Confidence

Ave Min Function

====== ====== ====== ====== ========== ========

99.01

68.00

129.60

21.60

15.65

15.20

16.00

15.62

0.00

0.39

50%

100% 100% Yield thread [all suspended]

56%

26% Create thread

44% Suspend [suspended] thread

15.79

15.20

23.65

23.20

2.26

1.60

51.39

51.20

21.60

29.47

28.00

15.60

15.20

27.73

24.00

16.00

24.00

2.40

52.00

21.60

29.60

16.00

28.00

0.31

0.39

0.24

0.29

0.22

0.40

74% 26% Resume thread

56% 44% Set priority

82%

86%

100%

74%

18% Get priority

76% 76% Kill [suspended] thread

0.00

100% 100% Yield [no other] thread

2% Resume [suspended low prio] thread

50% Resume [runnable low prio] thread

2% Suspend [runnable] thread

167

21.60

15.65

15.20

51.39

51.20

27.66

27.20

68.93

64.80

21.60

16.00

52.00

28.80

69.60

91.26

90.40

107.20

49.14

48.80

49.60

2.20

10.20

1.60

9.60

2.40

10.40

6.85

6.40

18.40

19.57

19.20

16.55

16.00

14.55

14.40

3.55

3.20

7.20

18.40

20.00

16.80

15.20

4.00

119.85

119.20

120.00

12.85

12.80

1.65

1.60

20.70

20.00

1.65

1.60

20.70

20.00

1.65

1.60

20.85

20.80

20.85

20.80

19.90

19.20

17.60

20.90

20.80

16.80

17.65

17.60

1.85

1.60

1.85

1.60

19.40

19.20

65.05

64.80

13.60

2.40

20.80

2.40

20.80

2.40

21.60

20.00

17.60

21.60

16.80

18.40

2.40

20.00

65.60

7.05

6.40

15.55

15.20

17.35

16.80

14.60

14.40

14.20

13.60

4.55

4.00

3.75

3.20

70.85

70.40

7.20

16.00

17.60

15.20

14.40

4.80

4.00

71.20

6.05

2.25

5.60

1.60

19.70

19.20

3.45

3.20

6.40

2.40

20.00

4.00

9.05

8.80

29.60

2.15

1.60

29.35

28.80

5.10

4.80

23.20

9.60

29.60

2.40

29.60

5.60

23.20

Appendix B. Real-time characterization

0.00

100% 100% Yield [only low prio] thread

0.39

56% 44% Suspend [runnable->not runnable]

0.29

0.41

0.35

0.64

0.39

76%

54%

72%

66%

57%

76% Kill [runnable] thread

44% Destroy [dead] thread

2% Destroy [runnable] thread

32% Resume [high priority] thread

57% Thread switch

0.30

75%

25% Scheduler lock

25% Scheduler unlock [0 threads]

25% Scheduler unlock [1 suspended]

25% Scheduler unlock [many suspended]

25% Scheduler unlock [many low prio]

0.39

56% 43% Init mutex

0.00

100% 100% Lock [unlocked] mutex

0.40

53% 53% Unlock [locked] mutex

0.34

0.24

0.39

0.24

68%

81%

56%

81%

31% Trylock [unlocked] mutex

81% Trylock [locked] mutex

56% Destroy mutex

18% Unlock/Lock mutex

0.09

0.17

0.09

0.17

93% 93% Create mbox

93% 93% Peek [empty] mbox

87% 12% Put [first] mbox

93% 93% Peek [1 msg] mbox

87% 12% Put [second] mbox

0.09

93% 93% Peek [2 msgs] mbox

93% 93% Get [first] mbox

93% 93% Get [second] mbox

0.17

87% 12% Tryput [first] mbox

0.00

100% 100% Peek item [non-empty] mbox

0.17

87% 87% Tryget [non-empty] mbox

0.00

100% 100% Peek item [empty] mbox

0.09

93% 93% Tryget [empty] mbox

0.34

68% 68% Waiting to get mbox

0.34

0.30

0.34

68%

75%

68%

68% Waiting to put mbox

75% Delete mbox

68% Put/Get mbox

0.24

0.39

0.34

0.30

0.34

0.39

81% 18% Init semaphore

56% 56% Post [0] semaphore

68% 31% Wait [1] semaphore

75% 75% Trywait [0] semaphore

75% 25% Trywait [1] semaphore

68% 31% Peek semaphore

68% 31% Destroy semaphore

56% 43% Post/Wait semaphore

0.39

0.24

0.37

0.34

56% 43% Create counter

81% 18% Get counter value

81% 18% Set counter value

62% 37% Tick counter

68% 68% Delete counter

0.34

68% 68% Create alarm

0.00

100% 100% Initialize alarm

0.34

68% 31% Disable alarm

0.34

0.37

68%

62%

31% Enable alarm

62% Delete alarm

0.00

100% 100% Tick counter [1 alarm]

168

Appendix B. Real-time characterization

138.00

137.60

138.40

40.40

40.00

40.80

704.25

697.60

804.00

155.20

105.20

104.80

151.20

117.57

104.80

149.60

117.49

104.80

148.80

192.59

177.60

316.00

0.40

100% 50% Tick counter [many alarms]

0.40

100% 50% Tick & fire counter [1 alarm]

12.47

93% 93% Tick & fire counters [>1 together]

0.00

100% 100% Tick & fire counters [>1 separately]

0.76

99% 94% Alarm latency [0 threads]

7.13

7.10

1.93

57% 25% Alarm latency [2 threads]

58% 26% Alarm latency [many threads]

98% 0% Alarm -> thread resume latency

22.10

21.60

24.00

0.00

Clock/interrupt latency

38.69

32.80

61.60

0.00

Clock DSR latency

297 276 316 (main stack:

All done, main stack

All done

752)

: stack used

Thread stack used (1120 total)

752 size 2400

: Interrupt stack used 288 size 4096

: Idlethread stack used 272 size 2048

Timing complete - 30350 ms total

PASS: < Basic timing OK>

EXIT: < done>

CPU : ARM 920T 20 MHz

Board: ARM PID Evaluation Board

CPU : ARM 920T 20 MHz

Startup, main stack

Startup

: stack used 404 size 2400

: Interrupt stack used 136 size 4096

: Idlethread stack used 84 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 15 ’ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 291.41 microseconds (364 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

Ave Min Max Var

Confidence

Ave Min Function

====== ====== ====== ====== ========== ========

257.78

168.00

568.00

48.70

56% 28% Create thread

169

50.21

49.60

36.26

36.00

37.20

36.80

56.24

56.00

5.20

4.80

50.40

36.80

37.60

56.80

5.60

122.75

122.40

123.20

50.19

49.60

50.40

69.49

66.40

69.60

37.01

36.80

64.75

55.20

50.19

49.60

37.60

65.60

50.40

36.24

36.00

36.80

122.75

122.40

123.20

67.76

67.20

68.00

167.07

158.40

168.00

213.49

212.00

249.60

122.81

120.00

389.60

4.70

4.00

23.70

23.20

23.60

23.20

23.70

23.20

23.60

23.20

4.80

24.00

15.65

15.20

42.40

45.37

44.80

39.20

34.45

34.40

8.00

16.00

42.40

46.40

39.20

35.20

8.00

284.42

284.00

284.80

29.40

28.80

3.35

3.20

49.35

48.80

3.35

3.20

49.35

48.80

3.35

3.20

49.15

48.80

49.15

48.80

47.80

47.20

41.40

40.80

49.40

48.80

40.15

40.00

40.95

40.80

4.05

4.00

49.60

40.80

41.60

4.80

4.05

4.00

45.60

4.80

45.60

153.27

152.80

153.60

29.60

4.00

49.60

4.00

49.60

4.00

49.60

48.00

41.60

16.80

36.60

36.00

39.60

39.20

34.80

34.40

33.35

32.80

16.80

36.80

40.00

35.20

33.60

10.30

8.80

9.60

8.80

10.40

8.80

166.92

166.40

167.20

13.60

4.85

4.80

13.60

5.60

Appendix B. Real-time characterization

0.29

0.35

76% 24% Yield thread [all suspended]

68% 68% Suspend [suspended] thread

0.40

100% 50% Resume thread

0.34

70% 70% Set priority

0.40

100% 50% Get priority

0.39

0.31

0.21

0.31

0.38

0.31

56%

74%

92%

56% Kill [suspended] thread

26% Yield [no other] thread

2% Resume [suspended low prio] thread

74% 74% Resume [runnable low prio] thread

80% 2% Suspend [runnable] thread

74% 26% Yield [only low prio] thread

0.34

0.39

0.34

0.35

1.46

4.17

70% 70% Suspend [runnable->not runnable]

56% 56% Kill [runnable] thread

70% 30% Destroy [dead] thread

92% 2% Destroy [runnable] thread

84% 90% Resume [high priority] thread

99% 99% Thread switch

0.17

0.37

87% 12% Scheduler lock

62% 37% Scheduler unlock [0 threads]

0.40

100% 50% Scheduler unlock [1 suspended]

0.37

62% 37% Scheduler unlock [many suspended]

0.40

100% 50% Scheduler unlock [many low prio]

0.39

56% 43% Init mutex

0.00

100% 100% Lock [unlocked] mutex

0.36

65% 31% Unlock [locked] mutex

0.00

100% 100% Trylock [unlocked] mutex

0.09

93% 93% Trylock [locked] mutex

0.00

100% 100% Destroy mutex

0.40

53% 46% Unlock/Lock mutex

0.30

0.24

0.34

0.24

0.34

0.24

0.39

0.30

75% 25% Create mbox

81% 81% Peek [empty] mbox

68% 31% Put [first] mbox

81% 81% Peek [1 msg] mbox

68% 31% Put [second] mbox

81% 81% Peek [2 msgs] mbox

56% 56% Get [first] mbox

56% 56% Get [second] mbox

75% 25% Tryput [first] mbox

75% 25% Peek item [non-empty] mbox

0.30

0.24

0.09

75% 25% Tryget [non-empty] mbox

81% 81% Peek item [empty] mbox

81% 81% Tryget [empty] mbox

93% 93% Waiting to get mbox

0.09

93% 93% Waiting to put mbox

0.00

100% 100% Delete mbox

0.39

59% 40% Put/Get mbox

0.00

100% 100% Init semaphore

0.30

75% 25% Post [0] semaphore

0.40

100% 50% Wait [1] semaphore

0.40

100% 50% Trywait [0] semaphore

0.34

68% 31% Trywait [1] semaphore

0.17

87% 12% Peek semaphore

0.00

100% 100% Destroy semaphore

0.36

65% 34% Post/Wait semaphore

0.00

100% 100% Create counter

0.09

93% 93% Get counter value

170

Appendix B. Real-time characterization

4.80

45.25

44.80

7.75

7.20

4.80

45.60

8.00

20.80

69.30

68.80

4.80

67.35

67.20

20.80

69.60

4.80

68.00

11.80

11.20

54.80

54.40

12.00

55.20

372.35

363.20

652.80

95.50

95.20

96.00

1757.92 1707.20 1996.80

404.37

404.00

404.80

256.57

254.40

395.20

296.60

255.20

359.20

307.49

265.60

357.60

467.04

432.00

788.80

55.63

54.40

60.80

0.00

100% 100% Set counter value

0.39

56% 43% Tick counter

0.34

68% 31% Delete counter

0.00

100% 100% Create alarm

0.37

62% 37% Initialize alarm

0.00

100% 100% Disable alarm

0.24

81% 81% Enable alarm

0.30

75% 25% Delete alarm

0.40

100% 50% Tick counter [1 alarm]

17.53

96% 96% Tick counter [many alarms]

0.37

62% 62% Tick & fire counter [1 alarm]

81.43

81% 81% Tick & fire counters [>1 together]

0.40

53% 53% Tick & fire counters [>1 separately]

2.17

98% 97% Alarm latency [0 threads]

23.53

53% 31% Alarm latency [2 threads]

27.52

53% 53% Alarm latency [many threads]

5.03

97% 1% Alarm -> thread resume latency

0.00

Clock/interrupt latency

101.23

80.80 1433.60

0.00

Clock DSR latency

316 316 316 (main stack:

All done, main stack

All done

752)

: stack used

Thread stack used (1120 total)

752 size 2400

: Interrupt stack used 288 size 4096

: Idlethread stack used 272 size 2048

Timing complete - 30780 ms total

PASS: < Basic timing OK>

EXIT: < done>

Board: Intel IQ80310 XScale Development Kit

CPU: Intel XScale 600MHz

Startup, main stack

Startup

: stack used 388 size 2400

: Interrupt stack used 148 size 4096

: Idlethread stack used 76 size 1120 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 73 ’ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 12.11 microseconds (399 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

128

171

Appendix B. Real-time characterization

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

0.99

0.04

0.47

0.02

0.29

0.02

0.48

0.35

0.50

0.39

0.43

0.28

0.01

0.05

0.42

1.39

0.15

0.16

0.45

0.43

0.48

0.35

0.26

0.21

2.58

0.33

0.55

0.28

0.43

0.31

0.21

1.00

0.59

1.43

3.12

0.87

Confidence

Ave Min Max Var Ave Min Function

====== ====== ====== ====== ========== ========

6.53

5.48

8.55

0.50

53% 23% Create thread

0.37

0.24

0.25

0.36

0.03

1.07

0.03

0.00

0.09

0.00

0.52

3.24

2.06

0.73

0.82

0.42

6.39

0.18

0.12

0.06

0.10

0.05

0.18

87%

71%

1% Yield thread [all suspended]

1% Suspend [suspended] thread

1% Resume thread

89% 1% Set priority

90% 90% Get priority

92% 1% Kill [suspended] thread

0.06

0.03

0.00

0.88

0.42

1.27

2.58

0.36

0.91

1.06

1.79

1.00

1.24

0.42

1.45

3.97

1.94

5.09

1.39

0.08

0.09

0.11

0.12

0.09

0.04

0.13

0.07

0.33

0.07

78% 3% Yield [no other] thread

85% 1% Resume [suspended low prio] thread

84%

56%

86%

4% Resume [runnable low prio] thread

76% 1% Suspend [runnable] thread

82% 4% Yield [only low prio] thread

73% 1% Suspend [runnable->not runnable]

78% 4% Kill [runnable] thread

81% 87% Destroy [dead] thread

78% 7% Destroy [runnable] thread

34% Resume [high priority] thread

0% Thread switch

0.00

0.18

0.09

0.21

0.00

2.09

1.39

0.64

0.70

0.64

1.39

3.27

3.88

2.24

0.67

1.27

3.09

0.21

0.08

0.07

0.34

0.23

0.26

0.21

0.13

0.24

0.13

81% 81% Scheduler lock

85% 7% Scheduler unlock [0 threads]

75% 8% Scheduler unlock [1 suspended]

78% 6% Scheduler unlock [many suspended]

81% 4% Scheduler unlock [many low prio]

56% 46% Init mutex

87% 87% Lock [unlocked] mutex

84% 71% Unlock [locked] mutex

87% 84% Trylock [unlocked] mutex

78% 9% Trylock [locked] mutex

78% 75% Destroy mutex

75% 9% Unlock/Lock mutex

0.21

0.00

0.27

0.00

0.15

0.00

0.21

0.09

0.21

0.15

0.18

0.03

0.21

0.00

0.09

1.27

2.48

0.39

3.48

0.39

0.58

0.45

3.67

0.82

3.18

1.39

3.33

0.79

0.58

0.36

0.45

2.88

2.39

0.41

0.07

0.29

0.03

0.04

0.26

0.11

0.33

0.19

0.23

0.06

0.05

0.02

0.09

0.20

0.14

65% 28% Create mbox

90% 87% Peek [empty] mbox

90% 78% Put [first] mbox

90% 90% Peek [1 msg] mbox

68% 3% Put [second] mbox

93% 93% Peek [2 msgs] mbox

84% 87% Get [first] mbox

75% 3% Get [second] mbox

90% 68% Tryput [first] mbox

78% 68% Peek item [non-empty] mbox

87% 90% Tryget [non-empty] mbox

68% 3% Peek item [empty] mbox

71% 65% Tryget [empty] mbox

96% 90% Waiting to get mbox

87%

84%

87%

84% Waiting to put mbox

12% Delete mbox

87% Put/Get mbox

172

Appendix B. Real-time characterization

0.35

0.19

0.25

0.32

0.20

0.07

0.06

1.45

0.70

0.05

0.02

0.38

0.03

1.10

0.58

0.04

0.54

0.03

0.39

0.03

0.00

0.36

0.00

0.50

5.30

0.24

5.12

0.82

0.64

14.13

13.85

5.56

9.69

9.98

5.45

9.45

9.48

10.38

9.48

11.72

11.30

0.00

0.21

0.06

0.00

1.42

0.00

0.12

0.00

1.36

0.45

0.88

1.79

0.52

0.45

0.52

1.79

2.88

0.42

0.45

0.58

0.48

4.30

3.12

0.42

1.36

0.70

0.97

5.97

1.36

14.55

6.00

12.52

12.76

24.67

21.33

0.45

0.04

0.06

0.21

0.06

0.10

0.06

0.04

0.47

0.09

0.04

0.06

0.05

75% 68% Init semaphore

81% 3% Post [0] semaphore

84% 81% Wait [1] semaphore

78% 68% Trywait [0] semaphore

62% 3% Trywait [1] semaphore

84% 81% Peek semaphore

71% 78% Destroy semaphore

87%

43%

87%

87% Post/Wait semaphore

34% Create counter

84% Get counter value

93% 93% Set counter value

59% 3% Tick counter

93% 78% Delete counter

0.47

0.18

0.07

0.12

0.06

0.08

0.14

0.11

0.09

0.22

0.23

0.59

0.32

62% 53% Create alarm

87% 3% Initialize alarm

90% 90% Disable alarm

84% 43% Enable alarm

84% 84% Delete alarm

84% 6% Tick counter [1 alarm]

84% 75% Tick counter [many alarms]

78% 43% Tick & fire counter [1 alarm]

78% 3% Tick & fire counters [>1 together]

78% 71% Tick & fire counters [>1 separately]

64% 71% Alarm latency [0 threads]

69% 14% Alarm latency [2 threads]

74% 45% Alarm latency [many threads]

81% 58% Alarm -> thread resume latency

1.87

3.02

1.82

2.58

10.42

7.67

0.00

Clock/interrupt latency

Clock DSR latency

9 0 260 (main stack:

All done, main stack

776)

: stack used

Thread stack used (1120 total)

776 size 2400

All done

: Interrupt stack used

: Idlethread stack used

268 size

244 size

4096

1120

Timing complete - 30300 ms total

PASS: < Basic timing OK>

EXIT: < done>

Board: Toshiba JMR3904 Evaluation Board

CPU : TMPR3904F 50MHz eCOS Kernel Timings

Note: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 0 ’ticks’ overhead

... this value will be factored out of all other measurements

173

Appendix B. Real-time characterization

Clock interrupt took 29.68 microseconds (45 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

128

Semaphores: 32

Scheduler operations: 128

Counters: 32

Alarms: 32

Ave Min Max Var

Confidence

Ave Min Function

====== ====== ====== ====== ========== ========

13.62

11.72

2.77

2.60

3.31

2.60

27.99

3.91

6.51

1.51

0.26

0.27

79%

83%

54% Create thread

79% Yield thread [all suspended]

12% Suspend [suspended] thread

2.58

4.94

1.95

4.56

0.71

0.65

14.97

14.32

2.25

7.27

2.28

1.95

6.51

1.95

7.81

11.07

1.95

25.39

9.11

12.37

7.16

0.47

0.60

0.10

0.87

0.57

0.42

0.51

58%

95%

79%

95%

37% Resume thread

79% Set priority

95% Get priority

95% Kill [suspended] thread

95% Yield [no other] thread

16% Resume [suspended low prio] thread

79% Resume [runnable low prio] thread

4.31

2.17

2.39

3.26

1.95

13.43

12.37

22.30

20.83

4.62

4.56

12.37

7.16

6.51

22.79

37.76

11.07

0.75

0.42

0.51

0.80

1.76

0.13

87% 79% Suspend [runnable] thread

95% 95% Yield [only low prio] thread

95% 58% Suspend [runnable->not runnable]

91% 91% Kill [runnable] thread

91% 91% Resume [high priority] thread

98% 98% Thread switch

1.51

2.36

2.39

2.38

1.30

1.95

2.60

3.26

5.21

4.56

5.21

0.29

0.31

0.32

68%

61%

68% Scheduler lock

37% Scheduler unlock [0 threads]

62% 36% Scheduler unlock [1 suspended]

61% 37% Scheduler unlock [many suspended]

61% 37% Scheduler unlock [many low prio]

0.90

2.48

2.83

2.30

1.99

0.04

0.65

1.95

2.60

1.95

1.30

0.00

42.40

42.32

1.44

0.51

2.93

0.51

4.19

0.45

3.28

3.34

2.69

2.75

3.15

2.22

2.40

1.30

0.00

2.60

0.00

3.91

0.00

2.60

1.95

2.60

1.95

3.26

8.46

9.11

6.51

5.86

1.30

44.92

5.86

1.30

9.11

1.30

5.21

0.65

10.42

9.77

9.11

7.81

9.11

6.51

5.86

0.35

0.50

0.42

0.45

0.24

0.08

0.16

0.28

0.25

0.51

0.25

0.34

0.28

0.45

0.40

0.32

0.48

0.41

0.42

71% 71% Init mutex

50% 46% Lock [unlocked] mutex

93% 93% Unlock [locked] mutex

96% 65% Trylock [unlocked] mutex

84% 12% Trylock [locked] mutex

96% 96% Destroy mutex

96% 96% Unlock/Lock mutex

96% 96% Create mbox

71% 25% Peek [empty] mbox

96% 78% Put [first] mbox

71% 25% Peek [1 msg] mbox

59% 59% Put [second] mbox

68% 31% Peek [2 msgs] mbox

65% 31% Get [first] mbox

78% 18% Get [second] mbox

78% 18% Tryput [first] mbox

93% 3% Peek item [non-empty] mbox

53% 43% Tryget [non-empty] mbox

96% 78% Peek item [empty] mbox

50% 46% Tryget [empty] mbox

174

Appendix B. Real-time characterization

0.47

0.59

0.00

4.01

3.26

26.18

26.04

0.65

1.30

10.42

30.60

0.92

2.24

2.32

2.03

1.91

0.77

0.65

1.95

1.30

0.00

0.61

0.00

22.62

22.14

3.91

6.51

7.16

5.86

4.56

1.95

30.60

0.26

0.15

0.40

0.28

71% 28% Waiting to get mbox

84% 12% Waiting to put mbox

81% 15% Delete mbox

96% 96% Put/Get mbox

0.38

0.43

0.48

0.24

0.23

0.30

0.15

0.61

71% 71% Init semaphore

96% 75% Post [0] semaphore

96% 65% Wait [1] semaphore

90% 6% Trywait [0] semaphore

78% 18% Trywait [1] semaphore

65% 9% Peek semaphore

84% 12% Destroy semaphore

96% 62% Post/Wait semaphore

0.92

0.69

0.41

3.21

0.65

0.00

2.60

0.00

3.91

1.95

1.30

5.86

3.26

1.57

4.52

0.61

4.43

1.30

3.91

0.00

3.91

0.87

2.93

0.65

2.60

14.83

14.32

4.56

13.02

1.95

9.11

2.60

6.51

22.79

4.88

4.56

11.07

83.25

82.03

102.86

17.58

16.93

27.34

26.18

24.74

33.88

29.30

36.37

29.30

40.36

56.64

61.20

7.85

6.51

14.97

0.38

0.08

0.33

0.27

0.16

0.38

0.57

0.15

0.43

0.32

0.43

0.60

0.51

1.23

0.61

0.30

1.70

3.25

0.00

Timing complete - 23540 ms total

PASS: < Basic timing OK>

EXIT: < done>

71% 71% Create counter

96% 96% Get counter value

56% 40% Set counter value

71% 21% Tick counter

84% 12% Delete counter

71% 71% Create alarm

50% 46% Initialize alarm

84% 12% Disable alarm

56% 40% Enable alarm

71% 71% Delete alarm

96% 65% Tick counter [1 alarm]

96% 59% Tick counter [many alarms]

96% 78% Tick & fire counter [1 alarm]

96% 93% Tick & fire counters [>1 together]

50% 46% Tick & fire counters [>1 separately]

97% 0% Alarm latency [0 threads]

85% 6% Alarm latency [2 threads]

53% 24% Alarm latency [many threads]

Clock/interrupt latency

Board: Toshiba REF 4955

CPU : Toshiba TX4955 66MHz

Startup, main stack

Startup

: stack used 960 size 2936

: Interrupt stack used 168 size 4096

: Idlethread stack used 372 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 3 ‘ticks’ overhead

... this value will be factored out of all other measurements

175

Appendix B. Real-time characterization

Clock interrupt took

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

4.00 microseconds (264 raw clock ticks)

128

0.12

0.35

0.43

0.45

0.46

0.73

0.77

0.58

0.51

0.12

4.72

1.01

0.02

0.89

0.02

0.69

0.02

0.81

0.72

0.81

0.67

0.77

Ave Min Max Var

Confidence

Ave Min Function

====== ====== ====== ====== ========== ========

11.21

0.66

0.63

9.58

0.65

0.53

14.11

1.29

3.06

0.95

0.02

0.17

48%

98%

82%

34% Create thread

98% Yield thread [all suspended]

82% Suspend [suspended] thread

0.54

0.78

0.05

2.06

0.65

1.15

0.54

0.53

0.74

0.05

1.89

0.65

1.02

0.52

1.06

1.39

0.36

6.65

0.68

3.03

1.18

0.02

0.05

0.01

0.25

0.00

0.20

0.03

98%

93%

98%

95%

98%

81%

96%

98% Resume thread

93% Set priority

98% Get priority

79% Kill [suspended] thread

98% Yield [no other] thread

81% Resume [suspended low prio] thread

96% Resume [runnable low prio] thread

0.94

0.65

0.54

1.97

1.03

2.55

5.62

1.84

0.88

0.65

0.53

1.89

0.92

2.33

4.11

1.83

1.27

0.68

0.86

2.98

4.94

4.38

13.23

2.79

0.01

0.00

0.01

0.12

0.17

0.24

0.99

0.02

95% 1% Suspend [runnable] thread

98% 98% Yield [only low prio] thread

98% 96% Suspend [runnable->not runnable]

84% 84% Kill [runnable] thread

89% 89% Destroy [dead] thread

89% 70% Destroy [runnable] thread

65% 40% Resume [high priority] thread

98% 98% Thread switch

0.02

0.35

0.15

0.64

0.65

0.55

0.50

0.11

4.70

0.67

0.00

0.68

0.00

0.68

0.00

0.71

0.65

0.62

0.71

0.65

0.35

1.17

3.38

3.27

4.50

1.42

0.83

0.41

5.58

3.48

0.53

4.20

0.33

0.76

0.30

3.83

1.02

2.74

2.27

2.41

0.15

74% 74% Scheduler lock

0.00

100% 100% Scheduler unlock [0 threads]

0.00

100% 100% Scheduler unlock [1 suspended]

0.13

0.15

0.30

0.16

0.23

0.05

0.02

0.05

0.40

0.03

0.29

0.02

0.01

0.02

0.19

0.02

0.22

0.10

78% 78% Scheduler unlock [many suspended]

75% 75% Scheduler unlock [many low prio]

62%

96%

71%

96%

50% Init mutex

96% Lock [unlocked] mutex

96% Unlock [locked] mutex

96% Trylock [unlocked] mutex

96% Trylock [locked] mutex

96% Destroy mutex

96% Unlock/Lock mutex

71% Create mbox

96% Peek [empty] mbox

96% 71% Put [first] mbox

96% 96% Peek [1 msg] mbox

50% 46% Put [second] mbox

96% 96% Peek [2 msgs] mbox

96% 96% Get [first] mbox

96% 96% Get [second] mbox

96% 71% Tryput [first] mbox

96% 96% Peek item [non-empty] mbox

96% 96% Tryget [non-empty] mbox

176

Appendix B. Real-time characterization

0.59

0.62

0.03

0.02

0.75

2.80

0.37

0.48

0.60

0.53

0.51

0.09

0.12

3.05

0.57

0.06

0.73

0.12

0.89

1.00

0.09

1.05

0.18

0.64

0.95

0.06

1.00

0.17

0.90

5.60

1.53

0.89

5.59

1.52

25.48

25.47

6.22

6.21

2.59

2.56

4.06

5.03

5.68

3.95

2.56

5.59

0.58

0.62

0.02

0.65

2.77

0.18

0.47

0.59

0.50

0.09

0.11

3.05

0.17

0.05

0.03

0.71

0.11

0.88

0.67

0.32

0.06

3.59

0.88

0.80

0.67

1.41

0.71

0.15

0.41

3.05

2.76

0.58

0.64

1.02

0.15

3.15

2.41

0.68

2.48

0.50

1.11

5.88

2.11

25.76

6.44

6.17

6.24

9.03

15.45

0.34

0.09

0.04

0.09

0.02

0.01

0.02

0.04

0.02

0.01

0.07

0.08

0.89

0.15

0.02

0.00

0.02

0.01

0.18

0.05

96% 96% Peek item [empty] mbox

96% 96% Tryget [empty] mbox

96% 96% Waiting to get mbox

50% 46% Waiting to put mbox

96% 96% Delete mbox

96% 96% Put/Get mbox

0.28

0.02

0.01

0.06

71% 71% Init semaphore

96% 96% Post [0] semaphore

50% 46% Wait [1] semaphore

96% 96% Trywait [0] semaphore

0.01

0.00

0.02

96%

50% Trywait [1] semaphore

96% Peek semaphore

96% Destroy semaphore

0.00

100% 100% Post/Wait semaphore

0.24

0.03

0.04

0.02

0.01

59% 25% Create counter

96% 96% Get counter value

96% 96% Set counter value

96% 96% Tick counter

50% 46% Delete counter

84% 71% Create alarm

96% 96% Initialize alarm

96% 96% Disable alarm

96% 96% Enable alarm

96% 96% Delete alarm

96% 96% Tick counter [1 alarm]

96% 96% Tick counter [many alarms]

96% 96% Tick & fire counter [1 alarm]

96% 96% Tick & fire counters [>1 together]

96% 96% Tick & fire counters [>1 separately]

98% 98% Alarm latency [0 threads]

78% 57% Alarm latency [2 threads]

59% 10% Alarm latency [many threads]

99% 99% Alarm -> thread resume latency

2.52

1.41

8.12

0.00

Clock/interrupt latency

2.05

1.17

6.00

0.00

Clock DSR latency

34 0 1072 (main stack: 1320) Thread stack used (1912 total)

All done, main stack

All done

: stack used

Interrupt stack used

: Idlethread stack used

1320 size

136 size

996 size

2936

4096

2048

Timing complete - 30360 ms total

PASS: < Basic timing OK>

EXIT: < done>

177

Appendix B. Real-time characterization

Board: Matsushita STDEVAL1 Board

CPU : MN103002A 60MHz eCOS Kernel Timings

Note: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 18 ’ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 13.73 microseconds (205 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

128

Semaphores: 32

Scheduler operations: 128

Counters: 32

Alarms: 32

Ave Min Max Var

Confidence

Ave Min Function

====== ====== ====== ====== ========== ========

14.36

11.53

2.64

2.53

2.25

1.93

23.53

5.07

4.80

1.81

0.20

0.31

54%

95%

45%

33% Create thread

95% Yield thread [all suspended]

83% Suspend [suspended] thread

2.19

3.42

0.31

8.26

2.58

5.07

2.27

2.00

3.00

0.13

7.40

2.47

4.53

2.07

4.93

8.40

1.20

18.80

5.13

8.67

4.53

0.28

0.47

0.19

0.93

0.21

0.44

0.23

91%

95%

79%

91% Resume thread

87% Set priority

58% Get priority

95% 87% Kill [suspended] thread

95% 95% Yield [no other] thread

62% 50% Resume [suspended low prio] thread

87% 87% Resume [runnable low prio] thread

4.76

2.63

2.09

4.07

2.53

1.87

10.79

10.00

20.30

18.40

5.53

5.47

9.40

4.73

4.27

18.20

28.80

12.13

0.65

0.18

0.27

0.81

1.42

0.11

66% 75% Suspend [runnable] thread

95% 95% Yield [only low prio] thread

91% 79% Suspend [runnable->not runnable]

95% 79% Kill [runnable] thread

79% 54% Resume [high priority] thread

98% 97% Thread switch

0.28

1.14

1.16

1.23

0.27

1.13

1.20

2.20

2.00

2.40

3.33

3.13

0.03

0.01

0.02

0.06

0.05

97%

99%

97% Scheduler lock

99% Scheduler unlock [0 threads]

99% 99% Scheduler unlock [1 suspended]

95% 95% Scheduler unlock [many suspended]

95% 95% Scheduler unlock [many low prio]

1.29

2.65

3.26

2.48

2.20

1.00

2.47

3.07

2.33

2.07

0.23

0.20

25.11

24.73

2.49

0.11

2.00

0.00

4.20

5.27

6.80

5.07

4.67

1.00

27.53

5.73

1.60

0.25

0.23

0.28

0.21

0.05

0.21

0.32

0.15

65% 50% Init mutex

93% 87% Lock [unlocked] mutex

93% 87% Unlock [locked] mutex

90% 87% Trylock [unlocked] mutex

93% 87% Trylock [locked] mutex

96% 93% Destroy mutex

65% 31% Unlock/Lock mutex

81%

84%

37% Create mbox

81% Peek [empty] mbox

178

Appendix B. Real-time characterization

3.01

0.10

3.09

0.06

3.10

3.13

2.99

2.65

3.05

3.16

2.48

0.23

0.22

3.08

0.13

2.80

16.01

15.53

2.60

0.00

2.60

0.00

2.80

2.60

2.33

2.73

2.93

2.27

0.85

2.00

2.05

1.85

0.67

1.93

2.00

1.80

1.82

0.36

1.80

0.33

0.38

0.33

12.38

12.20

9.47

1.67

8.33

1.13

7.93

7.53

8.53

6.80

7.60

6.27

5.73

2.07

1.93

7.93

19.00

3.27

3.87

3.47

2.53

1.33

1.87

16.27

0.52

0.15

0.50

0.08

0.40

0.43

0.52

0.42

0.31

0.30

0.14

0.13

0.42

0.52

0.19

0.12

0.09

0.10

0.04

0.06

0.09

0.30

96% 78% Put [first] mbox

87% 81% Peek [1 msg] mbox

93% 75% Put [second] mbox

96% 87% Peek [2 msgs] mbox

93% 84% Get [first] mbox

90% 78% Get [second] mbox

93% 75% Tryput [first] mbox

90% 78% Peek item [non-empty] mbox

93% 78% Tryget [non-empty] mbox

84% 84% Peek item [empty] mbox

84% 84% Tryget [empty] mbox

96% 87% Waiting to get mbox

96% 75% Waiting to put mbox

84% 84% Delete mbox

78%

96%

59% Put/Get mbox

50% Init semaphore

96% 90% Post [0] semaphore

96% 96% Wait [1] semaphore

96% 96% Trywait [0] semaphore

96% 96% Trywait [1] semaphore

96% 96% Peek semaphore

96% 96% Destroy semaphore

93% 87% Post/Wait semaphore

1.18

0.20

0.24

3.17

0.44

0.73

0.13

0.20

3.13

0.40

4.07

1.40

4.20

1.73

2.24

3.86

0.15

3.76

0.57

1.67

3.40

0.07

3.47

0.47

5.13

9.67

1.60

7.67

2.73

3.64

3.60

21.72

21.67

6.13

6.07

4.73

23.27

8.07

101.40

99.53

132.73

24.21

24.13

26.40

11.74

11.60

22.67

14.58

11.73

18.18

15.20

24.93

41.07

3.06

2.13

10.33

0.24

0.11

0.08

0.07

0.08

0.47

0.51

0.12

0.35

0.16

0.07

0.10

0.12

2.75

0.14

0.26

1.59

1.96

0.00

Timing complete - 23480 ms total

PASS: < Basic timing OK>

EXIT: < done>

78% 18% Create counter

87% 87% Get counter value

93% 93% Set counter value

93% 93% Tick counter

96% 96% Delete counter

68% 65% Create alarm

90% 78% Initialize alarm

96% 68% Disable alarm

93% 75% Enable alarm

96% 84% Delete alarm

96% 96% Tick counter [1 alarm]

96% 96% Tick counter [many alarms]

96% 96% Tick & fire counter [1 alarm]

93% 93% Tick & fire counters [>1 together]

96% 96% Tick & fire counters [>1 separately]

98% 98% Alarm latency [0 threads]

54% 28% Alarm latency [2 threads]

60% 43% Alarm latency [many threads]

Clock/interrupt latency

179

Appendix B. Real-time characterization

Board: Fujitsu SPARClite Evaluation Board

CPU : Fujitsu SPARClite MB8683X 100MHz eCOS Kernel Timings

Note: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 0 ’ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 17.19 microseconds (17 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

128

Mailboxes:

Semaphores:

Scheduler operations: 128

Counters:

Alarms:

Ave Min Max

Confidence

Var Ave Min Function

====== ====== ====== ====== ========== ========

48.59

47.00

63.01

1.41

66% 70% Create thread

2.13

2.00

5.00

0.24

95% 95% Yield thread [all suspended]

2.92

2.13

2.79

1.00

7.17

2.42

3.46

2.00

1.00

2.00

0.00

5.00

2.00

10.00

11.00

5.00

34.00

12.00

14.00

0.69

0.66

0.86

0.33

2.24

0.80

1.10

58%

75%

95%

37% Suspend [suspended] thread

20% Resume thread

54% Set priority

79% 16% Get priority

95% 95% Kill [suspended] thread

95% 95% Yield [no other] thread

75% 83% Resume [suspended low prio] thread

2.00

4.21

2.33

1.00

3.00

2.00

5.79

1.00

4.00

39.34

37.00

15.20

15.00

9.00

20.00

10.00

9.00

30.00

75.01

31.00

0.58

1.38

0.64

0.67

2.07

3.36

0.40

66% 29% Resume [runnable low prio] thread

95% 91% Suspend [runnable] thread

95% 95% Yield [only low prio] thread

58% 33% Suspend [runnable->not runnable]

95% 95% Kill [runnable] thread

91% 91% Resume [high priority] thread

97% 97% Thread switch

1.04

1.42

1.41

1.40

1.00

1.19

2.34

3.41

2.16

1.00

2.00

3.00

1.00

1.78

0.72

1.00

0.00

25.25

24.00

4.00

5.00

6.00

12.00

13.00

10.00

7.00

2.00

41.00

0.08

0.51

0.50

0.35

0.64

0.71

0.49

0.59

0.45

0.98

97% 97% Scheduler lock

60% 60% Scheduler unlock [0 threads]

61% 61% Scheduler unlock [1 suspended]

60% 60% Scheduler unlock [many suspended]

62% 62% Scheduler unlock [many low prio]

93% 93% Init mutex

93% 93% Lock [unlocked] mutex

96% 87% Unlock [locked] mutex

87% 9% Trylock [unlocked] mutex

59% 37% Trylock [locked] mutex

65% 31% Destroy mutex

71% 25% Unlock/Lock mutex

1.44

1.00

9.00

0.68

96% 78% Create mbox

180

Appendix B. Real-time characterization

0.94

3.06

0.69

2.44

0.78

3.78

2.97

2.53

2.72

2.63

1.97

2.09

0.84

0.81

1.00

0.00

2.38

2.00

23.41

22.00

0.00

2.00

0.00

2.00

0.00

3.00

2.00

1.00

3.00

13.00

3.00

10.00

3.00

14.00

9.00

12.00

13.00

6.00

9.00

4.00

11.00

47.00

0.23

0.62

0.52

0.68

0.44

0.83

0.61

0.80

0.81

0.94

0.42

0.49

0.42

0.46

0.66

1.47

84% 12% Peek [empty] mbox

71% 25% Put [first] mbox

59% 37% Peek [1 msg] mbox

96% 78% Put [second] mbox

68% 28% Peek [2 msgs] mbox

96% 53% Get [first] mbox

56% 31% Get [second] mbox

96% 75% Tryput [first] mbox

96% 56% Peek item [non-empty] mbox

90% 75% Tryget [non-empty] mbox

68% 21% Peek item [empty] mbox

78% 15% Tryget [empty] mbox

71% 25% Waiting to get mbox

68% 28% Waiting to put mbox

96% 87% Delete mbox

96% 96% Put/Get mbox

1.03

2.66

1.97

1.78

1.84

1.00

0.81

0.00

2.00

1.00

0.00

19.03

18.00

1.38

1.09

1.00

3.09

0.91

1.00

0.00

2.00

0.00

2.53

6.03

0.78

2.91

2.00

5.00

0.00

2.00

0.97

2.69

0.00

2.00

12.00

11.00

4.16

3.00

72.69

72.01

13.66

13.00

13.26

13.00

16.75

11.00

24.06

18.00

6.00

8.00

10.00

8.00

5.00

4.00

41.00

6.00

3.00

5.00

6.00

5.00

9.00

22.00

4.00

13.00

5.00

9.00

23.00

13.00

87.01

23.00

42.00

53.01

58.01

0.31

0.66

0.55

0.63

0.58

0.25

0.46

1.37

0.56

0.18

0.31

0.35

0.40

0.70

1.00

0.49

0.91

0.30

0.69

0.55

1.03

0.82

0.51

2.78

3.55

84% 12% Init semaphore

96% 50% Post [0] semaphore

68% 28% Wait [1] semaphore

56% 40% Trywait [0] semaphore

62% 34% Trywait [1] semaphore

84% 12% Peek semaphore

68% 28% Destroy semaphore

96% 96% Post/Wait semaphore

75% 75% Create counter

93% 93% Get counter value

78% 15% Set counter value

78% 9% Tick counter

75% 21% Delete counter

96% 65% Create alarm

50% 46% Initialize alarm

65% 31% Disable alarm

87% 50% Enable alarm

81% 15% Delete alarm

96% 50% Tick counter [1 alarm]

62% 34% Tick counter [many alarms]

84% 12% Tick & fire counter [1 alarm]

96% 96% Tick & fire counters [>1 together]

96% 62% Tick & fire counters [>1 separately]

98% 98% Alarm latency [0 threads]

64% 16% Alarm latency [2 threads]

67% 25% Alarm latency [many threads]

Clock/interrupt latency 3.61

2.00

13.00

0.00

Timing complete - 23590 ms total

PASS: < Basic timing OK>

EXIT: < done>

181

Appendix B. Real-time characterization

Board: Cogent CMA MPC860 (PowerPC) Evaluation

CPU : MPC860, revision A3 33MHz eCOS Kernel Timings

Note: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 0 ’ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 14.46 microseconds (30 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

128

Semaphores: 32

Scheduler operations: 128

Counters: 32

Alarms: 32

Ave Min Max Var

Confidence

Ave Min Function

====== ====== ====== ====== ========== ========

26.78

23.52

4.00

3.84

3.78

3.36

41.76

4.80

7.68

1.97

0.23

0.38

66%

70%

50%

37% Create thread

70% Yield thread [all suspended]

45% Suspend [suspended] thread

3.56

5.28

3.36

4.32

0.84

0.48

11.76

10.08

4.14

7.14

3.60

3.84

5.76

3.36

7.68

12.96

3.84

32.16

8.64

17.76

8.16

0.37

0.76

0.39

1.70

0.45

1.07

0.42

95%

83%

91%

95%

79%

95%

91% Resume thread

66% Set priority

54% Get priority

95% Kill [suspended] thread

75% Yield [no other] thread

70% Resume [suspended low prio] thread

87% Resume [runnable low prio] thread

6.10

4.00

3.66

5.28

3.84

3.36

11.66

10.08

31.12

27.84

7.52

7.20

14.88

5.76

8.64

30.24

53.28

15.84

0.80

0.25

0.47

1.58

2.35

0.30

62% 70% Suspend [runnable] thread

79% 79% Yield [only low prio] thread

95% 79% Suspend [runnable->not runnable]

79% 91% Kill [runnable] thread

87% 50% Resume [high priority] thread

50% 48% Thread switch

1.00

2.57

2.58

2.59

0.48

2.40

1.69

4.15

5.82

3.70

3.42

0.36

1.44

3.84

5.28

3.36

2.88

0.00

43.41

42.72

2.88

3.84

4.32

5.76

10.56

8.64

6.72

1.92

45.12

0.21

0.23

0.24

63% 14% Scheduler lock

65% 65% Scheduler unlock [0 threads]

64% 64% Scheduler unlock [1 suspended]

62% 62% Scheduler unlock [many suspended]

61% 61% Scheduler unlock [many low prio]

0.37

0.47

0.38

0.41

0.26

0.25

0.34

96% 71% Init mutex

96% 75% Lock [unlocked] mutex

62% 28% Unlock [locked] mutex

96% 59% Trylock [unlocked] mutex

75% 15% Trylock [locked] mutex

62% 34% Destroy mutex

81% 3% Unlock/Lock mutex

182

Appendix B. Real-time characterization

3.27

0.57

6.16

0.48

5.92

0.60

4.69

4.68

5.86

4.00

4.59

3.75

3.93

0.63

0.54

4.84

3.84

3.36

0.00

4.32

24.18

23.52

2.88

0.00

5.76

0.00

5.28

0.00

4.32

5.28

3.36

1.72

3.15

3.85

3.24

3.22

0.96

2.88

3.36

2.88

0.96

0.99

0.48

0.96

24.71

24.00

8.16

2.40

11.04

1.92

10.56

2.40

12.00

11.52

11.04

9.12

12.48

7.68

9.60

2.40

1.92

12.00

29.76

3.84

6.24

8.64

6.24

2.88

1.92

28.80

0.39

0.34

0.48

0.27

0.35

0.30

0.54

0.52

0.47

0.38

0.61

0.34

0.45

0.28

0.19

0.47

0.66

0.33

0.34

0.30

0.34

0.32

0.12

0.06

0.40

96% 50% Create mbox

50% 21% Peek [empty] mbox

87% 87% Put [first] mbox

50% 28% Peek [1 msg] mbox

90% 6% Put [second] mbox

62% 12% Peek [2 msgs] mbox

93% 93% Get [first] mbox

93% 93% Get [second] mbox

62% 31% Tryput [first] mbox

87% 9% Peek item [non-empty] mbox

71% 75% Tryget [non-empty] mbox

53% 43% Peek item [empty] mbox

65% 31% Tryget [empty] mbox

68% 6% Waiting to get mbox

75% 9% Waiting to put mbox

56% 40% Delete mbox

81%

90%

75% Put/Get mbox

6% Init semaphore

96% 62% Post [0] semaphore

68% 28% Wait [1] semaphore

46% 46% Trywait [0] semaphore

50% 46% Trywait [1] semaphore

84% 12% Peek semaphore

96% 96% Destroy semaphore

87% 6% Post/Wait semaphore

2.31

0.45

0.42

4.14

0.91

1.44

0.00

3.84

0.48

6.24

0.96

4.80

2.40

5.23

5.58

0.75

8.02

1.32

4.32

4.80

0.48

7.20

0.96

7.68

12.96

1.92

14.40

3.84

4.63

4.32

23.67

23.52

7.24

6.72

6.24

25.44

10.56

106.83

106.56

110.40

26.18

25.44

29.76

10.79

10.08

17.20

13.92

29.28

35.52

29.69

22.56

47.04

7.66

3.84

19.20

0.77

0.08

0.16

0.26

0.19

0.61

0.72

0.30

0.53

0.29

0.28

0.23

0.21

0.35

0.46

0.66

1.48

3.58

0.00

Timing complete - 23530 ms total

PASS: < Basic timing OK>

EXIT: < done>

46% 56% Create counter

87% 9% Get counter value

75% 18% Set counter value

50% 43% Tick counter

71% 21% Delete counter

65% 53% Create alarm

68% 84% Initialize alarm

90% 56% Disable alarm

84% 68% Enable alarm

56% 40% Delete alarm

53% 43% Tick counter [1 alarm]

78% 78% Tick counter [many alarms]

84% 12% Tick & fire counter [1 alarm]

96% 65% Tick & fire counters [>1 together]

81% 9% Tick & fire counters [>1 separately]

53% 55% Alarm latency [0 threads]

67% 21% Alarm latency [2 threads]

57% 17% Alarm latency [many threads]

Clock/interrupt latency

183

Appendix B. Real-time characterization

Board: NEC VR4373

CPU : NEC VR4300 133MHz

Startup, main stack

Startup

: stack used 1304 size 3576

: Interrupt stack used 980 size 4096

: Idlethread stack used 494 size 2552 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 3 ‘ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 6.49 microseconds (431 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations: 128

Counters: 32

Alarms: 32

128

1.82

0.70

1.21

0.86

0.69

2.64

1.50

3.66

13.65

2.04

Confidence

Ave Min Max Var Ave Min Function

====== ====== ====== ====== ========== ========

17.21

16.18

22.14

0.88

75% 68% Create thread

0.84

0.90

0.74

1.11

0.11

2.93

0.88

0.78

0.62

0.65

0.90

0.05

2.24

0.78

1.29

3.20

1.16

1.70

0.35

8.27

1.92

0.10

0.35

0.12

0.25

0.09

0.78

0.16

81%

87%

81%

75%

93%

81% Yield thread [all suspended]

87% Suspend [suspended] thread

68% Resume thread

68% Set priority

75% Get priority

75% Kill [suspended] thread

81% Yield [no other] thread

1.20

0.63

1.07

0.78

0.62

2.24

1.07

2.75

8.33

1.89

4.71

0.86

1.61

1.58

0.84

4.35

5.82

7.74

27.88

3.32

0.62

0.09

0.13

0.09

0.43

0.56

0.82

3.70

0.15

87% 62% Resume [suspended low prio] thread

68% 68% Resume [runnable low prio] thread

81%

50%

46%

68% Suspend [runnable] thread

81% 81% Yield [only low prio] thread

68% 68% Suspend [runnable->not runnable]

62% Kill [runnable] thread

93% 87% Destroy [dead] thread

50% 56% Destroy [runnable] thread

43% Resume [high priority] thread

49% Thread switch

0.19

0.50

0.52

0.56

0.57

0.89

0.90

0.05

0.41

0.20

0.75

0.74

0.83

1.59

1.29

1.49

1.41

2.33

3.35

4.38

0.13

0.14

0.15

0.27

0.20

0.25

48% 44% Scheduler lock

89% 73% Scheduler unlock [0 threads]

89% 64% Scheduler unlock [1 suspended]

42% 47% Scheduler unlock [many suspended]

43% 47% Scheduler unlock [many low prio]

65% 50% Init mutex

96% 75% Lock [unlocked] mutex

96% 93% Unlock [locked] mutex

184

Appendix B. Real-time characterization

2.63

1.16

0.45

9.49

1.95

2.87

3.62

3.17

1.70

1.11

1.19

8.93

3.08

0.89

0.33

1.62

0.41

2.95

6.03

0.65

3.05

0.47

2.11

4.96

2.51

26.71

5.91

9.86

9.73

16.12

3.44

0.57

4.71

0.57

3.83

0.57

5.02

1.61

4.18

3.49

4.09

1.97

2.36

0.59

0.90

3.23

8.80

0.77

0.66

0.07

7.95

0.65

0.59

0.00

7.71

0.50

0.86

1.01

0.87

0.74

0.36

0.25

7.85

0.90

0.07

0.06

0.88

0.13

1.04

0.10

1.15

0.10

1.01

0.09

1.03

0.93

1.07

0.89

1.04

0.79

0.84

0.13

0.93

4.74

1.37

1.35

0.11

1.23

0.81

1.17

0.08

1.14

0.21

1.03

4.96

1.70

0.18

0.99

4.96

1.67

26.39

26.38

5.65

5.64

2.55

2.38

5.37

8.79

3.80

5.83

0.81

0.02

0.83

0.02

0.83

0.02

0.81

0.77

0.72

0.83

0.68

0.72

0.02

0.77

4.51

0.21

0.57

0.74

0.60

0.62

0.11

0.12

7.52

0.44

0.05

0.86

0.12

0.17

0.10

0.09

0.19

0.17

0.13

0.21

0.32

0.29

0.28

0.14

0.26

0.14

0.21

0.27

0.11

0.31

0.12

0.22

0.10

0.27

0.14

0.23

0.21

0.26

0.15

0.29

0.05

0.02

0.05

0.02

96% 75% Trylock [unlocked] mutex

75% 75% Trylock [locked] mutex

75% 75% Destroy mutex

50% 46% Unlock/Lock mutex

93%

71%

53%

68% Create mbox

68% Peek [empty] mbox

71% Put [first] mbox

68% 68% Peek [1 msg] mbox

93% 75% Put [second] mbox

71% 71% Peek [2 msgs] mbox

96% 87% Get [first] mbox

84% 62% Get [second] mbox

68% 50% Tryput [first] mbox

93% 71% Peek item [non-empty] mbox

90% 81% Tryget [non-empty] mbox

87%

93%

87%

90%

93%

90%

62%

65%

68% Peek item [empty] mbox

68% Tryget [empty] mbox

62% Waiting to get mbox

62% Waiting to put mbox

71% Delete mbox

78% Put/Get mbox

50% Init semaphore

93% 56% Post [0] semaphore

93% 56% Wait [1] semaphore

90% 59% Trywait [0] semaphore

93% 56% Trywait [1] semaphore

65% 56% Peek semaphore

93% 56% Destroy semaphore

43% Post/Wait semaphore

28% Create counter

96% 96% Get counter value

96% 96% Set counter value

96% 96% Tick counter

96% 96% Delete counter

0.27

0.31

0.05

0.15

62% 25% Create alarm

96% 93% Initialize alarm

90% 90% Disable alarm

93% 87% Enable alarm

0.04

0.07

90% 90% Delete alarm

96% 96% Tick counter [1 alarm]

0.00

100% 100% Tick counter [many alarms]

0.05

96% 96% Tick & fire counter [1 alarm]

0.02

0.19

0.95

1.29

96%

50%

57%

96% Tick & fire counters [>1 together]

96% Tick & fire counters [>1 separately]

54% Alarm latency [0 threads]

34% Alarm latency [2 threads]

14% Alarm latency [many threads]

5.85

2.26

16.24

0.00

Clock/interrupt latency

1540 1536 1544 (main stack: 1664) Thread stack used (2552 total)

All done, main stack

All done

: stack used

Interrupt stack used

: Idlethread stack used

1664 size

312 size

1440 size

3576

4096

2552

Timing complete - 23810 ms total

185

Appendix B. Real-time characterization

PASS: < Basic timing OK>

EXIT: < done>

Board: Intel SA1110 (Assabet)

CPU : StrongARM 221.2 MHz

Microseconds for one run through Dhrystone:

Dhrystones per Second:

VAX MIPS rating = 174.586

3.3

306748.5

Startup, main stack

Startup

: stack used 420 size 2400

: Interrupt stack used 136 size 4096

: Idlethread stack used 84 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 0 ‘ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 3.20 microseconds (11 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

Confidence

Ave Min Max Var Ave Min Function

====== ====== ====== ====== ========== ========

5.98

4.88

14.38

0.70

57% 35% Create thread

0.86

1.05

1.07

1.36

0.73

2.93

0.81

1.09

0.54

2.44

1.90

3.53

3.80

5.97

1.90

13.56

0.08

0.19

0.18

0.22

0.19

0.39

87%

46%

48%

87% Yield thread [all suspended]

39% Suspend [suspended] thread

35% Resume thread

45% 39% Set priority

85% 50% Get priority

79% 70% Kill [suspended] thread

0.89

1.63

1.03

1.74

0.93

1.06

2.56

2.02

3.09

0.81

1.36

0.81

1.36

0.81

1.90

1.63

2.44

4.34

4.61

3.53

6.51

4.61

3.26

13.02

7.05

15.19

0.14

0.17

0.19

0.22

0.18

0.19

0.41

0.22

0.51

89% 89% Yield [no other] thread

57% 29% Resume [suspended low prio] thread

46% 42% Resume [runnable low prio] thread

87% 6% Suspend [runnable] thread

98% 78% Yield [only low prio] thread

42% 39% Suspend [runnable->not runnable]

87% 34% Kill [runnable] thread

92% 3% Destroy [dead] thread

78% 46% Destroy [runnable] thread

186

0.47

0.77

0.90

0.85

0.69

0.44

0.38

2.74

0.43

0.49

0.33

1.03

0.42

0.70

0.59

1.33

0.61

1.35

0.58

1.38

1.40

1.27

1.34

1.47

1.12

1.14

0.59

1.28

2.64

0.52

0.97

1.05

0.86

0.79

0.33

4.16

6.77

1.81

0.25

0.51

5.43

1.63

0.00

0.27

0.54

0.81

0.54

0.27

3.80

13.02

7.87

2.17

3.80

4.07

3.26

2.17

1.90

9.49

1.90

2.17

1.63

2.44

1.90

2.98

1.63

5.70

1.63

5.43

1.36

4.88

5.15

4.88

4.61

5.15

4.34

4.07

1.36

5.43

10.31

0.27

0.54

0.27

2.44

0.27

0.00

0.81

0.27

0.54

0.27

1.09

0.27

1.09

0.27

1.09

0.81

1.09

0.81

0.27

0.81

2.17

0.70

1.65

0.75

1.75

0.81

0.54

1.36

0.54

1.36

0.54

1.01

4.19

1.48

0.81

4.07

1.36

20.23

20.07

4.70

4.61

2.81

2.71

2.44

6.78

1.63

7.05

2.44

2.17

5.43

3.80

22.52

6.78

14.38

1.36

1.09

2.17

4.34

5.15

3.26

3.53

1.63

8.95

Appendix B. Real-time characterization

0.59

0.18

75% 17% Resume [high priority] thread

49% 49% Thread switch

0.05

0.06

0.07

0.06

89% 10% Scheduler lock

85% 13% Scheduler unlock [0 threads]

85% 13% Scheduler unlock [1 suspended]

85% 14% Scheduler unlock [many suspended]

85% 13% Scheduler unlock [many low prio]

0.15

0.28

0.24

0.23

0.11

0.30

62% 31% Init mutex

84% 65% Lock [unlocked] mutex

96% 96% Unlock [locked] mutex

65% 31% Trylock [unlocked] mutex

43% 46% Trylock [locked] mutex

90% 90% Destroy mutex

75% 96% Unlock/Lock mutex

0.19

0.26

0.21

0.18

0.19

0.17

0.42

0.18

0.13

0.22

0.20

0.21

0.14

0.31

0.13

0.31

0.11

0.25

0.26

0.28

0.22

0.27

0.23

0.24

0.12

0.32

0.48

96% 65% Create mbox

75% 9% Peek [empty] mbox

96% 93% Put [first] mbox

81% 3% Peek [1 msg] mbox

96% 87% Put [second] mbox

78% 6% Peek [2 msgs] mbox

59% 37% Get [first] mbox

62% 34% Get [second] mbox

90% 65% Tryput [first] mbox

59% 6% Peek item [non-empty] mbox

84% 12% Tryget [non-empty] mbox

59% 31% Peek item [empty] mbox

71% 25% Tryget [empty] mbox

78% 6% Waiting to get mbox

78% 6% Waiting to put mbox

87% 78% Delete mbox

96% 96% Put/Get mbox

46% 46% Init semaphore

90% 56% Post [0] semaphore

75% 21% Wait [1] semaphore

56% 28% Trywait [0] semaphore

96% 62% Trywait [1] semaphore

96% 56% Peek semaphore

96% 75% Destroy semaphore

96% 96% Post/Wait semaphore

96% 56% Create counter

56% 3% Get counter value

78% 6% Set counter value

84% 50% Tick counter

90% 65% Delete counter

0.20

0.40

0.18

0.38

0.15

0.16

0.20

0.21

0.16

0.20

93% 62% Create alarm

96% 81% Initialize alarm

43% 43% Disable alarm

65% 81% Enable alarm

62% 28% Delete alarm

56% 40% Tick counter [1 alarm]

96% 68% Tick counter [many alarms]

96% 78% Tick & fire counter [1 alarm]

96% 65% Tick & fire counters [>1 together]

87% 87% Tick & fire counters [>1 separately]

98% 98% Alarm latency [0 threads]

187

Appendix B. Real-time characterization

3.19

9.71

5.77

2.38

2.02

2.71

7.87

5.43

0.81

1.09

13.56

18.17

45.57

9.49

7.32

0.38

1.25

0.68

0.00

73% 59% Alarm latency [2 threads]

59% 53% Alarm latency [many threads]

97% 97% Alarm -> thread resume latency

Clock/interrupt latency

Clock DSR latency

11 0 316 (main stack:

All done, main stack

764)

: stack used

Thread stack used (1120 total)

764 size 2400

All done : Interrupt stack used 287 size 4096

All done : Idlethread stack used 272 size 2048

Timing complete - 30220 ms total

Board: Intel SA1100 (Brutus)

CPU : StrongARM 221.2 MHz

Microseconds for one run through Dhrystone:

Dhrystones per Second:

VAX MIPS rating = 174.586

3.3

306748.5

Startup, main stack

Startup

: stack used 404 size 2400

: Interrupt stack used 136 size 4096

: Idlethread stack used 87 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 0 ‘ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 3.09 microseconds (11 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

Ave Min Max Var

Confidence

Ave Min Function

====== ====== ====== ====== ========== ========

6.63

0.83

1.27

1.25

1.52

0.97

5.43

0.81

1.09

0.54

18.99

2.17

5.15

7.87

2.71

0.77

0.04

0.30

0.25

0.30

0.28

70%

98%

68%

82%

78%

64%

37% Create thread

98% Yield thread [all suspended]

73% Suspend [suspended] thread

1% Resume thread

75% Set priority

51% Get priority

188

0.52

0.59

0.36

1.13

0.39

0.86

1.86

1.55

0.77

1.67

1.63

1.50

1.58

1.79

1.29

1.33

0.73

0.76

1.47

2.70

0.58

1.07

1.14

0.96

0.94

0.33

4.21

0.76

0.75

1.56

0.75

0.47

0.89

0.96

0.86

0.69

0.49

0.39

2.83

3.45

0.90

1.86

1.25

2.01

0.90

1.25

2.92

2.45

3.95

8.55

1.85

0.25

0.52

0.51

0.27

0.00

0.81

0.27

0.54

1.36

6.78

1.63

6.24

6.51

5.43

7.05

5.15

5.97

1.90

6.78

12.75

3.53

5.70

6.51

5.15

4.88

2.17

10.85

4.07

1.90

6.78

1.90

2.71

4.88

5.15

4.88

3.26

2.44

11.66

19.53

6.24

5.15

10.04

6.24

5.15

18.72

10.31

23.60

19.53

11.94

1.63

1.90

1.36

1.63

1.09

0.54

1.09

0.54

1.09

2.17

0.27

0.54

0.81

0.54

0.27

3.80

0.54

1.09

0.54

0.27

0.54

0.27

2.44

2.71

0.81

1.36

0.81

1.63

0.81

1.90

2.71

6.24

1.63

0.00

0.27

3.26

2.71

2.44

2.98

1.90

4.07

9.77

Appendix B. Real-time characterization

0.40

0.17

0.31

0.40

0.37

0.43

0.32

0.37

0.21

0.19

0.39

0.63

0.20

0.35

0.40

0.34

0.11

0.41

0.25

0.20

0.39

0.20

0.33

0.32

0.22

0.28

0.19

0.55

0.66

0.17

0.33

0.25

0.32

0.17

0.24

0.57

0.33

0.89

1.15

0.21

0.05

0.07

0.06

84% 76% Kill [suspended] thread

98% 98% Yield [no other] thread

68% 50% Resume [suspended low prio] thread

82% 1% Resume [runnable low prio] thread

70% 84% Suspend [runnable] thread

98% 98% Yield [only low prio] thread

84% 1% Suspend [runnable->not runnable]

85% 43% Kill [runnable] thread

95% 54% Destroy [dead] thread

68% 54% Destroy [runnable] thread

60% 23% Resume [high priority] thread

49% 49% Thread switch

89% 10% Scheduler lock

85% 13% Scheduler unlock [0 threads]

85% 13% Scheduler unlock [1 suspended]

85% 13% Scheduler unlock [many suspended]

85% 13% Scheduler unlock [many low prio]

71% 21% Init mutex

87% 59% Lock [unlocked] mutex

96% 81% Unlock [locked] mutex

68% 65% Trylock [unlocked] mutex

65% 65% Trylock [locked] mutex

96% 96% Destroy mutex

71% 96% Unlock/Lock mutex

96% 56% Create mbox

84% 50% Peek [empty] mbox

68% 59% Put [first] mbox

84% 50% Peek [1 msg] mbox

68% 62% Put [second] mbox

46% 37% Peek [2 msgs] mbox

87% 34% Get [first] mbox

75% 34% Get [second] mbox

56% 62% Tryput [first] mbox

68% 53% Peek item [non-empty] mbox

71% 25% Tryget [non-empty] mbox

87% 87% Peek item [empty] mbox

96% 84% Tryget [empty] mbox

84% 56% Waiting to get mbox

40% 43% Waiting to put mbox

59% 84% Delete mbox

96% 96% Put/Get mbox

96% 50% Init semaphore

56% 75% Post [0] semaphore

71% 75% Wait [1] semaphore

96% 81% Trywait [0] semaphore

96% 75% Trywait [1] semaphore

84% 84% Peek semaphore

96% 78% Destroy semaphore

96% 96% Post/Wait semaphore

0.20

0.34

0.21

0.26

0.19

56% 40% Create counter

81% 46% Get counter value

81% 9% Set counter value

59% 37% Tick counter

90% 78% Delete counter

0.24

0.54

65% 31% Create alarm

96% 90% Initialize alarm

189

Appendix B. Real-time characterization

0.77

1.86

0.89

0.99

4.22

0.54

1.36

0.54

0.81

4.07

1.51

1.36

20.29

20.07

4.71

4.61

2.88

3.24

2.71

15.71

12.48

5.95

5.43

3.25

0.81

2.71

9.22

3.26

6.78

4.61

23.33

7.87

23.87

17.36

27.40

64.56

14.11

0.23

0.51

0.25

0.21

0.22

0.24

0.23

0.20

0.33

0.40

1.47

1.02

0.00

84% 50% Disable alarm

96% 75% Enable alarm

65% 21% Delete alarm

96% 59% Tick counter [1 alarm]

96% 71% Tick counter [many alarms]

96% 78% Tick & fire counter [1 alarm]

96% 53% Tick & fire counters [>1 together]

96% 96% Tick & fire counters [>1 separately]

99% 99% Alarm latency [0 threads]

79% 58% Alarm latency [2 threads]

53% 17% Alarm latency [many threads]

97% 97% Alarm -> thread resume latency

Clock/interrupt latency

2.68

1.09

12.75

0.00

Clock DSR latency

29 0 316 (main stack:

All done, main stack

764)

: stack used

Thread stack used (1120 total)

764 size 2400

All done : Interrupt stack used 288 size 4096

All done : Idlethread stack used 260 size 2048

Timing complete - 30280 ms total

Board: Motorola MBX

CPU : Motorola MPC860 66MHZ

Startup, main stack

Startup

: stack used 643 size 5664

: Interrupt stack used 427 size 4096

: Idlethread stack used 236 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 0 ‘ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 25.36 microseconds (79 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations: 128

Counters: 32

Alarms: 32

128

Confidence

190

Appendix B. Real-time characterization

Ave Min Max Var Ave Min Function

====== ====== ====== ====== ========== ========

27.58

25.60

5.94

5.76

6.06

5.44

44.16

7.04

10.56

2.07

0.22

0.57

93%

75%

93% Create thread

62% Yield thread [all suspended]

75% Suspend [suspended] thread

5.42

7.10

0.86

4.80

6.40

0.64

16.74

15.04

6.14

5.76

9.74

8.96

9.60

14.08

1.92

36.48

10.56

18.56

0.53

0.90

0.22

2.47

0.55

1.10

87%

93%

81% Resume thread

87% Set priority

50% Get priority

93% 93% Kill [suspended] thread

93% 93% Yield [no other] thread

93% 93% Resume [suspended low prio] thread

5.28

9.40

6.04

4.80

8.32

5.76

5.68

5.12

16.10

14.40

8.54

7.68

20.20

18.56

39.02

36.48

13.13

12.80

9.28

18.56

8.96

9.60

35.20

16.00

40.64

57.28

22.08

0.54

1.14

0.38

0.52

2.39

0.94

2.55

3.28

0.15

93% 81% Resume [runnable low prio] thread

93% 93% Suspend [runnable] thread

93%

87%

78%

93% Yield [only low prio] thread

68% 75% Suspend [runnable->not runnable]

93% 93% Kill [runnable] thread

87% Destroy [dead] thread

93% Destroy [runnable] thread

87% Resume [high priority] thread

20% Thread switch

0.59

3.67

3.69

0.32

3.52

1.60

5.12

4.80

5.12

0.09

0.17

82% 16% Scheduler lock

99% 54% Scheduler unlock [0 threads]

99%

54%

99%

53% Scheduler unlock [1 suspended]

54% Scheduler unlock [many suspended]

50% Scheduler unlock [many low prio]

2.41

6.83

6.74

5.53

4.84

0.34

2.24

6.40

5.12

4.48

0.00

56.10

55.68

4.72

0.75

6.79

0.46

6.68

0.50

7.13

6.97

6.24

5.98

6.52

5.50

5.76

0.50

5.12

5.44

0.32

0.50

7.45

0.32

7.04

37.47

36.80

4.48

0.64

6.40

0.32

6.40

0.32

6.40

5.76

5.44

6.08

5.44

11.84

13.12

9.60

7.36

0.96

59.52

10.24

1.92

12.80

1.60

12.16

1.60

14.08

13.44

11.52

11.20

13.12

10.24

10.88

1.60

15.04

48.64

2.49

5.09

6.25

4.84

4.98

2.24

4.80

5.76

4.48

4.80

1.66

1.24

1.28

0.96

40.74

40.32

6.08

8.64

10.88

8.32

8.00

3.84

3.20

49.28

0.25

0.34

0.40

0.25

0.17

0.06

0.21

0.37

0.16

0.41

0.19

0.37

0.20

0.49

0.47

0.38

0.39

0.49

0.30

0.32

0.19

0.49

0.70

0.28

0.27

0.32

0.23

0.26

0.20

0.17

0.53

96% 75% Init mutex

75% 90% Lock [unlocked] mutex

96% 96% Unlock [locked] mutex

84% 12% Trylock [unlocked] mutex

78% 15% Trylock [locked] mutex

90% 3% Destroy mutex

93% 3% Unlock/Lock mutex

96% 96% Create mbox

75% 75% Peek [empty] mbox

96% 90% Put [first] mbox

93% 68% Peek [1 msg] mbox

96% 96% Put [second] mbox

93% 56% Peek [2 msgs] mbox

90% 46% Get [first] mbox

84% 78% Get [second] mbox

78% 81% Tryput [first] mbox

78% 62% Peek item [non-empty] mbox

93% 81% Tryget [non-empty] mbox

68% 28% Peek item [empty] mbox

96% 96% Tryget [empty] mbox

96% 53% Waiting to get mbox

96% 53% Waiting to put mbox

96% 93% Delete mbox

96% 96% Put/Get mbox

96% 56% Init semaphore

46% 46% Post [0] semaphore

93% 3% Wait [1] semaphore

68% 25% Trywait [0] semaphore

96% 71% Trywait [1] semaphore

68% 15% Peek semaphore

65% 31% Destroy semaphore

96% 96% Post/Wait semaphore

191

Appendix B. Real-time characterization

2.65

0.85

0.68

7.13

1.30

2.24

0.64

6.72

0.96

6.08

2.24

1.92

8.64

3.20

3.69

8.98

0.96

8.76

3.52

8.32

0.64

8.32

7.68

17.60

2.88

17.60

1.99

7.44

1.60

7.36

21.68

21.44

5.12

9.92

24.64

10.95

10.56

15.04

132.79

132.48

136.32

25.18

24.96

28.80

23.06

22.72

31.53

27.20

36.86

30.40

47.36

56.00

58.88

0.23

0.22

0.08

0.24

0.12

0.29

0.61

0.14

0.59

0.21

0.15

0.25

0.26

0.23

0.29

0.40

0.63

4.15

84% 9% Create counter

90% 53% Get counter value

96% 96% Set counter value

78% 18% Tick counter

84% 12% Delete counter

96% 84% Create alarm

68% 62% Initialize alarm

71% 21% Disable alarm

96% 87% Enable alarm

81% 12% Delete alarm

96% 96% Tick counter [1 alarm]

96% 53% Tick counter [many alarms]

78% 18% Tick & fire counter [1 alarm]

59% 37% Tick & fire counters [>1 together]

96% 65% Tick & fire counters [>1 separately]

98% 98% Alarm latency [0 threads]

96% 0% Alarm latency [2 threads]

50% 28% Alarm latency [many threads]

11.41

8.96

16.32

0.00

Clock/interrupt latency

609 603 651 (main stack: 1059) Thread stack used (1704 total)

All done, main stack

All done

: stack used

Interrupt stack used

: Idlethread stack used

1059 size

251 size

587 size

5664

4096

2048

Timing complete - 23690 ms total

PASS: < Basic timing OK>

EXIT: < done>

Board: Hitachi EDK7708

CPU: Hitachi SH3/7708 60MHz

Startup, main stack

Startup

: stack used

: Interrupt stack used

: Idlethread stack used

444 size 4112

76 size 4096

96 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 2 ‘ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 14.75 microseconds (55 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

192

Appendix B. Real-time characterization

Thread switches:

Mutexes:

128

Mailboxes:

Semaphores:

Scheduler operations: 128

Counters:

Alarms:

Ave Min Max

Confidence

Var Ave Min Function

====== ====== ====== ====== ========== ========

15.43

13.60

24.00

1.29

62% 50% Create thread

3.33

3.20

4.27

0.18

93% 68% Yield thread [all suspended]

2.90

2.93

4.30

0.65

9.72

3.33

2.40

2.67

3.73

0.27

8.53

3.20

5.33

4.80

10.13

2.13

21.33

4.53

0.36

0.27

0.73

0.28

1.45

0.20

81%

93%

62% Suspend [suspended] thread

87% Resume thread

93% Set priority

68% 62% Get priority

93% 93% Kill [suspended] thread

93% 75% Yield [no other] thread

5.30

2.80

4.82

3.32

2.82

9.45

5.30

11.83

10.67

19.53

17.33

6.70

6.67

4.80

2.40

4.00

3.20

2.40

8.53

4.53

10.13

4.53

8.27

4.00

4.27

19.47

11.20

25.07

31.20

11.47

0.65

0.27

0.49

0.16

0.25

1.25

0.74

1.65

1.88

0.07

93% 87% Resume [suspended low prio] thread

81% 75% Resume [runnable low prio] thread

68% 25% Suspend [runnable] thread

93% 68% Yield [only low prio] thread

81% 12% Suspend [runnable->not runnable]

93% 93% Kill [runnable] thread

87%

93%

75%

99%

93% Destroy [dead] thread

93% Destroy [runnable] thread

75% Resume [high priority] thread

99% Thread switch

0.33

1.74

1.72

1.81

1.86

0.27

1.60

0.80

2.67

3.20

0.10

0.14

0.10

0.02

75%

99%

75% Scheduler lock

50% Scheduler unlock [0 threads]

99% 57% Scheduler unlock [1 suspended]

75% 23% Scheduler unlock [many suspended]

94% 4% Scheduler unlock [many low prio]

1.22

3.21

3.36

2.83

2.53

1.07

2.93

2.67

2.40

0.28

0.27

20.09

19.73

2.38

0.45

3.70

0.45

3.67

0.42

3.98

3.97

3.51

3.29

4.06

3.03

3.36

0.57

0.52

3.88

2.13

0.27

3.20

0.27

3.20

0.27

3.47

3.20

2.93

3.47

2.67

3.20

0.27

3.47

3.20

5.87

7.47

5.33

2.93

0.80

23.20

4.53

1.33

7.20

0.80

5.60

0.53

7.47

4.80

6.67

5.60

7.20

5.33

4.80

1.33

1.07

7.47

0.20

0.17

0.30

0.22

0.14

0.03

0.23

0.17

0.15

0.29

0.13

0.23

0.13

0.24

0.28

0.29

0.26

0.19

0.18

0.09

0.11

0.30

96%

68%

96%

84%

65% Init mutex

28% Lock [unlocked] mutex

84% 75% Unlock [locked] mutex

96% 65% Trylock [unlocked] mutex

96% 53% Trylock [locked] mutex

96% Destroy mutex

12% Unlock/Lock mutex

59% 34% Create mbox

56% 40% Peek [empty] mbox

84% 59% Put [first] mbox

62% 34% Peek [1 msg] mbox

81% 6% Put [second] mbox

59% 40% Peek [2 msgs] mbox

59% 9% Get [first] mbox

59% 12% Get [second] mbox

56% 78% Tryput [first] mbox

59% 65% Peek item [non-empty] mbox

68% 3% Tryget [non-empty] mbox

93% 3% Peek item [empty] mbox

96% 56% Tryget [empty] mbox

84% 3% Waiting to get mbox

62% 21% Waiting to put mbox

78% 65% Delete mbox

193

Appendix B. Real-time characterization

12.04

11.73

17.33

1.17

2.67

3.00

2.54

2.42

0.79

1.07

2.40

2.67

2.40

0.53

0.77

0.53

12.64

12.27

2.40

4.27

4.53

4.80

2.93

2.13

1.87

17.07

1.27

0.54

0.47

3.47

0.80

1.07

0.27

3.20

0.53

1.86

5.12

0.44

1.60

4.80

0.27

4.77

1.02

4.27

0.80

3.56

3.47

15.04

14.93

5.75

5.60

79.60

79.47

17.04

16.80

12.44

12.27

14.06

12.27

19.62

17.07

2.79

2.40

2.93

1.33

1.60

4.80

2.13

4.00

9.07

1.33

9.60

2.67

5.33

16.27

8.00

81.07

18.93

29.60

27.20

38.40

6.13

0.33

0.16

0.15

0.17

0.20

0.03

0.15

0.12

0.28

0.17

0.13

0.17

0.16

0.13

0.21

0.36

0.19

0.35

0.18

0.15

0.16

0.21

0.17

0.15

0.31

0.53

1.44

0.00

96% 96% Put/Get mbox

71% 71% Init semaphore

62% 25% Post [0] semaphore

65% 12% Wait [1] semaphore

96% 71% Trywait [0] semaphore

96% 96% Trywait [1] semaphore

59% 28% Peek semaphore

71% 25% Destroy semaphore

84% 96% Post/Wait semaphore

53% 43% Create counter

59% 21% Get counter value

46% 43% Set counter value

53% 28% Tick counter

62% 25% Delete counter

43% 40% Create alarm

93% 75% Initialize alarm

87% 53% Disable alarm

87% 62% Enable alarm

53% 40% Delete alarm

84% 84% Tick counter [1 alarm]

71% 71% Tick counter [many alarms]

96% 68% Tick & fire counter [1 alarm]

96% 65% Tick & fire counters [>1 together]

65% 31% Tick & fire counters [>1 separately]

96% 96% Alarm latency [0 threads]

82% 4% Alarm latency [2 threads]

57% 34% Alarm latency [many threads]

Clock/interrupt latency

376 376 376 (main stack:

All done, main stack

764)

: stack used

Thread stack used (992 total)

764 size 4112

All done : Interrupt stack used 176 size 4096

All done : Idlethread stack used 352 size 2048

Timing complete - 23860 ms total

PASS: < Basic timing OK>

EXIT: < done>

Board: CQ CqREEK SH3 Evaluation Board (cq7708)

CPU: Hitachi SH3/7708 60MHz

Startup, main stack

Startup

: stack used

: Interrupt stack used

: Idlethread stack used

448 size 4112

80 size 4096

96 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

194

Appendix B. Real-time characterization

Reading the hardware clock takes 2 ‘ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 19.17 microseconds (71 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

Confidence

Ave Min Max Var Ave Min Function

====== ====== ====== ====== ========== ========

20.62

14.40

26.93

3.23

48% 26% Create thread

3.16

2.91

2.73

4.05

0.82

9.07

3.19

2.93

2.40

3.73

0.27

8.53

2.93

4.27

5.87

6.40

11.47

2.67

24.27

7.20

0.09

0.17

0.19

0.27

0.17

0.51

0.14

78%

57%

64%

62%

56%

78%

70%

20% Yield thread [all suspended]

1% Suspend [suspended] thread

15% Resume thread

90% Set priority

3% Get priority

71% Kill [suspended] thread

28% Yield [no other] thread

5.45

2.67

4.95

3.15

2.82

8.92

4.53

2.40

4.27

2.93

2.40

8.00

5.10

4.53

11.81

10.93

22.15

20.80

6.85

6.67

17.87

5.07

11.47

4.53

5.60

24.27

12.00

37.33

54.67

13.60

0.49

0.15

0.28

0.11

0.21

0.51

0.27

0.81

1.27

0.19

78% 17% Resume [suspended low prio] thread

56% 28% Resume [runnable low prio] thread

82%

84%

92%

99%

14% Suspend [runnable] thread

73% 25% Yield [only low prio] thread

84% 10% Suspend [runnable->not runnable]

14% Kill [runnable] thread

59% 39% Destroy [dead] thread

87% 95% Destroy [runnable] thread

92% Resume [high priority] thread

50% Thread switch

0.27

1.74

1.81

1.75

0.27

1.60

1.22

3.18

3.40

2.77

2.35

1.07

2.93

3.20

2.40

2.13

0.78

0.53

22.80

22.40

1.07

2.67

2.93

4.27

4.00

4.27

7.20

8.00

5.87

3.47

2.67

28.80

0.01

0.14

0.11

0.15

0.23

0.27

0.31

0.22

0.14

0.51

99% 99% Scheduler lock

99% 50% Scheduler unlock [0 threads]

99% 50% Scheduler unlock [1 suspended]

72% 26% Scheduler unlock [many suspended]

50% 49% Scheduler unlock [many low prio]

96% 78% Init mutex

96% 53% Lock [unlocked] mutex

96% 96% Unlock [locked] mutex

87% 9% Trylock [unlocked] mutex

65% 31% Trylock [locked] mutex

68% 28% Destroy mutex

96% 71% Unlock/Lock mutex

2.61

0.52

3.54

0.50

3.62

0.52

3.93

3.92

3.37

2.40

0.27

3.20

0.27

3.20

0.27

3.47

2.93

6.13

1.60

7.73

1.60

6.93

2.13

10.13

7.47

6.93

0.26

0.19

0.35

0.17

0.34

0.23

0.43

0.40

0.36

96% 62% Create mbox

40% 37% Peek [empty] mbox

93% 78% Put [first] mbox

46% 37% Peek [1 msg] mbox

59% 65% Put [second] mbox

31% 43% Peek [2 msgs] mbox

65% 65% Get [first] mbox

56% 56% Get [second] mbox

59% 68% Tryput [first] mbox

195

Appendix B. Real-time characterization

3.30

3.93

2.94

3.23

0.58

2.67

3.47

2.67

2.93

0.27

0.55

3.82

0.27

3.47

13.35

12.80

6.93

9.33

6.13

6.67

2.67

1.87

9.87

21.33

1.22

2.42

2.96

2.37

2.29

1.07

2.13

2.67

2.13

0.66

0.81

0.53

14.47

14.13

1.44

0.62

0.56

3.39

0.83

1.07

0.27

3.20

0.53

2.93

4.27

5.07

4.53

3.47

2.13

2.93

21.33

3.47

1.07

1.60

4.27

1.87

0.38

0.44

0.25

0.27

0.20

0.14

0.39

0.50

0.19

0.12

0.16

0.17

0.13

0.43

0.29

0.14

0.17

0.16

0.14

84% 40% Peek item [non-empty] mbox

65% 71% Tryget [non-empty] mbox

43% 43% Peek item [empty] mbox

56% 84% Tryget [empty] mbox

62% 21% Waiting to get mbox

62% 21% Waiting to put mbox

96% 93% Delete mbox

87%

56%

62%

78% Put/Get mbox

96% 59% Init semaphore

81% 15% Post [0] semaphore

68% 21% Wait [1] semaphore

62% 34% Trywait [0] semaphore

96% 53% Trywait [1] semaphore

96% 68% Peek semaphore

75% 21% Destroy semaphore

96% 96% Post/Wait semaphore

71% Create counter

3% Get counter value

50% 25% Set counter value

53% 40% Tick counter

68% 15% Delete counter

2.02

5.06

0.73

4.82

1.19

3.63

1.87

4.27

0.27

4.27

0.80

3.47

4.00

11.73

2.40

11.47

3.47

5.60

15.01

14.93

5.50

5.33

74.27

74.13

16.90

16.53

16.70

16.53

17.85

16.53

8.00

76.80

19.47

36.27

34.40

63.26

58.40

80.00

30.37

29.33

124.80

7.37

9.00

5.07

4.53

17.87

26.93

0.21

0.46

0.22

0.48

0.22

0.20

0.13

0.22

0.21

0.23

0.33

0.47

2.64

1.68

93% 68% Create alarm

78% 18% Initialize alarm

84%

52%

98%

3% Disable alarm

81% 65% Enable alarm

87% 9% Delete alarm

96% 59% Tick counter [1 alarm]

87% 87% Tick counter [many alarms]

96% 65% Tick & fire counter [1 alarm]

96% 78% Tick & fire counters [>1 together]

81% 15% Tick & fire counters [>1 separately]

98% 98% Alarm latency [0 threads]

73% 0% Alarm latency [2 threads]

32% Alarm latency [many threads]

97% Alarm -> thread resume latency

106 0 376 (main stack:

All done, main stack

764)

: stack used

Thread stack used (992 total)

764 size 4112

All done : Interrupt stack used 176 size 4096

All done : Idlethread stack used 352 size 2048

Timing complete - 30310 ms total

PASS: < Basic timing OK>

EXIT: < done>

0.00

Clock/interrupt latency

Clock DSR latency

196

Board: Hitachi HS7729PCI HS7729 SH3

CPU: Hitachi SH3/7729 132MHz

Appendix B. Real-time characterization

Startup, main stack

Startup

: stack used

: Interrupt stack used

: Idlethread stack used

464 size 4112

92 size 4096

94 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 3 ’ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 18.10 microseconds (149 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

Confidence

Ave Min Max Var Ave Min Function

====== ====== ====== ====== ========== ========

18.33

15.52

28.24

1.47

53% 28% Create thread

3.08

3.23

2.70

4.12

0.61

9.14

3.04

2.91

3.03

2.55

4.00

0.48

8.61

2.91

6.79

6.18

7.52

1.33

18.91

4.48

0.13

0.16

0.15

0.16

0.07

0.42

0.07

78%

59%

54%

96%

57%

85%

68%

89% Yield thread [all suspended]

70% Suspend [suspended] thread

82% Resume thread

81% Set priority

28% Get priority

57% Kill [suspended] thread

20% Yield [no other] thread

5.12

2.54

5.00

3.04

2.91

8.82

4.73

2.42

4.36

2.91

2.79

8.12

5.07

4.48

11.17

10.55

22.43

21.45

7.99

7.88

3.03

9.45

4.61

3.27

15.39

12.73

22.91

32.73

13.58

0.29

0.09

0.21

0.07

0.08

0.36

0.37

0.52

0.61

0.14

60% 53% Resume [suspended low prio] thread

39% 40% Resume [runnable low prio] thread

75%

68%

81%

98%

1% Suspend [runnable] thread

65% 21% Yield [only low prio] thread

43% 31% Suspend [runnable->not runnable]

29% Kill [runnable] thread

76% 50% Destroy [dead] thread

78% 67% Destroy [runnable] thread

50% Resume [high priority] thread

86% Thread switch

0.37

1.74

1.75

1.71

1.76

4.23

3.12

2.54

0.36

1.70

3.88

2.91

2.42

1.33

2.06

2.42

3.64

10.67

6.91

2.91

0.02

0.06

0.07

0.03

0.08

97% 97% Scheduler lock

70% 70% Scheduler unlock [0 threads]

92% 64% Scheduler unlock [1 suspended]

89% 89% Scheduler unlock [many suspended]

96% 64% Scheduler unlock [many low prio]

0.41

0.29

0.11

96% 93% Unlock [locked] mutex

96% 87% Trylock [unlocked] mutex

18% 46% Trylock [locked] mutex

197

Appendix B. Real-time characterization

0.88

0.73

22.33

22.06

3.15

25.94

1.92

0.61

4.00

0.30

3.82

0.32

4.19

3.91

3.51

3.25

3.86

2.87

3.15

0.34

2.79

3.03

0.24

0.36

4.49

0.24

4.24

12.67

12.36

1.82

0.48

3.64

0.24

3.64

0.24

3.76

3.27

2.91

3.52

4.73

1.70

9.45

0.73

6.67

1.33

9.21

5.21

8.12

7.15

8.73

3.76

4.24

1.33

1.45

10.91

19.52

0.87

2.74

3.39

2.62

2.76

1.09

0.85

2.55

3.15

2.42

2.67

0.85

0.97

0.73

13.09

12.85

1.45

4.48

4.24

5.33

3.27

2.91

3.39

16.12

0.14

0.23

0.19

0.15

0.36

0.09

0.22

0.12

0.34

0.16

0.34

0.30

0.37

0.12

0.10

0.09

0.41

0.43

65%

81%

96% Destroy mutex

62% Unlock/Lock mutex

96% 93% Create mbox

84% 75% Peek [empty] mbox

96% 87% Put [first] mbox

84% 75% Peek [1 msg] mbox

90% 84% Put [second] mbox

81% 81% Peek [2 msgs] mbox

84% 50% Get [first] mbox

84% 75% Get [second] mbox

93% 87% Tryput [first] mbox

62% 56% Peek item [non-empty] mbox

93% 84% Tryget [non-empty] mbox

84% 71% Peek item [empty] mbox

46% 40% Tryget [empty] mbox

43% 46% Waiting to get mbox

53% 37% Waiting to put mbox

96% 96% Delete mbox

96% 96% Put/Get mbox

1.57

0.91

0.55

4.19

0.87

1.45

0.73

0.48

4.00

0.73

3.88

2.18

0.97

5.82

3.15

2.50

6.16

0.50

5.16

1.18

5.22

2.30

5.70

0.36

4.85

1.09

5.09

5.21

12.97

1.70

8.73

2.30

7.39

52.37

52.12

6.73

6.55

52.73

8.24

108.65

108.61

109.21

54.25

54.06

54.79

17.36

17.09

19.75

17.09

39.02

34.06

29.82

28.00

50.67

29.31

28.36

105.09

5.08

3.88

11.15

0.05

0.18

0.14

0.21

0.08

0.19

0.17

0.19

93% 93% Init semaphore

50% 50% Post [0] semaphore

78% 50% Wait [1] semaphore

96% 65% Trywait [0] semaphore

46% 43% Trywait [1] semaphore

68% 56% Peek semaphore

90% 65% Destroy semaphore

84% 65% Post/Wait semaphore

0.15

0.16

0.09

0.13

0.16

0.18

0.47

0.11

0.29

0.12

0.14

0.20

0.13

0.07

0.11

0.23

1.65

2.00

1.27

0.00

96% 93% Create counter

46% 68% Get counter value

90%

84%

93%

62% Set counter value

75% Tick counter

93% Delete counter

81% 90% Create alarm

96% 71% Initialize alarm

62% 34% Disable alarm

78% 78% Enable alarm

84% 65% Delete alarm

96% 93% Tick counter [1 alarm]

37% 56% Tick counter [many alarms]

78% 68% Tick & fire counter [1 alarm]

87% 87% Tick & fire counters [>1 together]

65% 18% Tick & fire counters [>1 separately]

82% 57% Alarm latency [0 threads]

46% 40% Alarm latency [2 threads]

53% 15% Alarm latency [many threads]

98% 97% Alarm -> thread resume latency

Clock/interrupt latency

7.32

5.09

16.73

0.00

Clock DSR latency

6 0 380 (main stack:

All done, main stack

820)

: stack used

Thread stack used (992 total)

820 size 4112

All done : Interrupt stack used 196 size 4096

All done : Idlethread stack used 360 size 2048

Timing complete - 29960 ms total

198

Appendix B. Real-time characterization

PASS: < Basic timing OK>

EXIT: < done>

Board: Hitachi Solution Engine 7751 SH4 (se7751)

CPU: Hitachi SH4/7751 162MHz

Startup, main stack

Startup

: stack used

: Interrupt stack used

: Idlethread stack used

464 size 4112

92 size 4096

94 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 1 ‘ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 14.27 microseconds (96 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

Ave Min Max

Confidence

Var Ave Min Function

====== ====== ====== ====== ========== ========

8.06

5.63

12.15

1.37

46% 29% Create thread

1.15

1.04

5.19

0.15

98% 98% Yield thread [all suspended]

1.13

1.11

1.45

0.21

4.15

1.12

0.89

1.19

0.15

3.56

1.04

5.04

5.19

3.56

1.19

13.04

3.70

0.27

0.26

0.23

0.10

0.53

0.12

89%

53%

62% Suspend [suspended] thread

71% Resume thread

53% Set priority

90% 79% Get priority

68% 64% Kill [suspended] thread

98% 70% Yield [no other] thread

1.75

1.10

1.59

1.13

1.09

4.96

1.33

0.89

1.33

1.04

0.89

4.30

1.95

4.41

1.48

3.85

13.15

11.41

3.10

2.96

8.00

4.59

5.93

4.30

3.56

11.70

8.00

10.37

23.85

6.22

0.38

0.25

0.33

0.13

0.21

0.44

0.34

0.47

1.11

0.11

59%

87%

81%

75%

53%

73%

41%

65% Resume [suspended low prio] thread

73% Resume [runnable low prio] thread

79% Suspend [runnable] thread

98% 71% Yield [only low prio] thread

89% 70% Suspend [runnable->not runnable]

68% 39% Kill [runnable] thread

57% Destroy [dead] thread

57% Destroy [runnable] thread

39% Resume [high priority] thread

39% Thread switch

0.13

0.00

1.33

0.06

74% 21% Scheduler lock

199

Appendix B. Real-time characterization

0.74

0.00

1.63

1.04

0.89

1.04

0.00

1.93

9.93

0.15

1.04

1.19

0.89

0.30

8.59

0.59

0.00

2.52

0.00

2.52

0.15

0.89

0.59

0.30

8.74

1.33

2.52

3.26

3.41

1.63

1.33

1.78

10.37

1.78

2.67

2.37

0.59

5.93

4.74

5.48

4.89

5.78

3.11

3.85

0.74

0.44

5.78

11.56

2.67

5.63

5.33

4.15

2.96

1.78

12.59

4.30

1.19

6.37

0.74

4.74

0.76

0.77

0.76

0.22

2.07

2.06

1.48

1.31

1.47

1.15

1.20

0.21

0.19

2.19

10.23

0.52

1.23

1.45

1.13

1.00

0.37

9.09

0.93

0.26

3.03

0.23

2.93

0.37

0.98

1.08

0.98

0.73

0.33

0.34

9.36

0.03

0.05

0.04

0.26

0.32

0.31

0.28

0.17

0.13

0.43

0.40

0.17

0.47

0.14

0.46

0.13

0.37

0.34

0.37

0.32

0.38

0.18

0.21

0.14

0.10

0.27

0.15

0.26

0.13

0.15

0.16

0.07

0.09

0.33

96%

95%

96%

56%

96% Scheduler unlock [0 threads]

96% Scheduler unlock [1 suspended]

95% Scheduler unlock [many suspended]

95% Scheduler unlock [many low prio]

65% 34% Init mutex

93% 93% Lock [unlocked] mutex

90% 87% Unlock [locked] mutex

90% 84% Trylock [unlocked] mutex

87% 87% Trylock [locked] mutex

90% 84% Destroy mutex

71% 71% Unlock/Lock mutex

84% 71% Create mbox

71% 59% Peek [empty] mbox

50% 59% Put [first] mbox

68% 15% Peek [1 msg] mbox

71% 59% Put [second] mbox

68% 15% Peek [2 msgs] mbox

84% 59% Get [first] mbox

78% 59% Get [second] mbox

62% 53% Tryput [first] mbox

96% 75% Peek item [non-empty] mbox

84% 65% Tryget [non-empty] mbox

71% 56% Peek item [empty] mbox

93% 84% Tryget [empty] mbox

68% 18% Waiting to get mbox

43% 15% Waiting to put mbox

93% 71% Delete mbox

53% 37% Put/Get mbox

71% 71% Init semaphore

96% 68% Post [0] semaphore

68% 93% Wait [1] semaphore

93% 93% Trywait [0] semaphore

71% 25% Trywait [1] semaphore

93% 93% Peek semaphore

96% Destroy semaphore

31% Post/Wait semaphore

0.54

0.13

0.14

3.74

0.32

1.59

1.89

0.20

1.62

0.40

4.03

3.70

14.18

13.93

4.81

4.59

30.77

30.52

15.10

14.52

8.78

8.59

11.29

9.33

18.70

15.70

19.40

18.81

0.15

0.00

3.56

0.15

1.19

1.48

0.15

1.33

0.30

3.26

0.59

5.33

2.07

3.11

6.37

0.74

5.63

1.33

0.23

0.07

0.17

0.12

0.29

0.44

0.09

0.41

0.13

59% 37% Create counter

68% 25% Get counter value

68% 25% Set counter value

53% 75% Tick counter

71% 21% Delete counter

71% 43% Create alarm

87% 78% Initialize alarm

87% 84% Disable alarm

87% 84% Enable alarm

87% 62% Delete alarm

5.78

15.70

5.93

33.63

17.04

18.22

17.48

26.37

57.48

0.27

0.13

0.20

0.23

0.20

1.02

1.45

0.65

68% 56% Tick counter [1 alarm]

81% 75% Tick counter [many alarms]

81% 15% Tick & fire counter [1 alarm]

75% 65% Tick & fire counters [>1 together]

71% 3% Tick & fire counters [>1 separately]

97% 89% Alarm latency [0 threads]

56% 22% Alarm latency [2 threads]

54% 22% Alarm latency [many threads]

97% 97% Alarm -> thread resume latency

200

Appendix B. Real-time characterization

4.18

2.81

8.89

0.00

Clock/interrupt latency

3.98

2.52

11.56

0.00

Clock DSR latency

6 0 380 (main stack:

All done, main stack

All done

728)

: stack used

Thread stack used (992 total)

728 size 4112

: Interrupt stack used 196 size 4096

: Idlethread stack used 360 size 2048

Timing complete - 29790 ms total

PASS: < Basic timing OK>

EXIT: < done>

Board: PC

CPU: 433MHz Celeron

Startup, main stack

Startup

: stack used 124 size 2912

: Interrupt stack used 280 size 4108

: Idlethread stack used 62 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 8 ’ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 6.75 microseconds (8 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

Ave Min Max Var

Confidence

Ave Min Function

====== ====== ====== ====== ========== ========

3.93

0.71

0.65

1.68

0.00

8.38

3.35

5.03

0.93

0.84

68%

59%

64%

3% Create thread

59% Yield thread [all suspended]

64% Suspend [suspended] thread

0.63

0.76

0.39

1.34

0.68

0.92

0.63

0.84

0.73

0.00

1.68

6.70

1.68

0.79

0.83

0.60

0.67

0.81

0.83

0.79

62%

54%

76%

73%

59%

54%

62%

62% Resume thread

54% Set priority

76% Get priority

25% Kill [suspended] thread

59% Yield [no other] thread

45% Resume [suspended low prio] thread

62% Resume [runnable low prio] thread

0.84

100% 50% Suspend [runnable] thread

0.82

56% 56% Yield [only low prio] thread

201

0.00

3.35

0.00

3.35

0.00

1.68

0.00

1.68

0.00

3.35

0.58

1.26

0.86

1.44

4.45

1.62

0.41

0.48

0.59

0.45

0.52

0.79

0.84

0.63

0.52

0.58

3.40

0.99

0.47

0.79

0.42

0.79

0.37

0.73

0.79

0.68

0.73

0.63

0.68

0.26

0.63

0.73

3.25

0.63

0.52

0.21

3.30

0.79

0.42

0.37

0.73

0.63

0.89

0.84

0.52

0.89

0.58

0.63

5.03

1.68

3.35

1.68

6.70

1.68

5.03

1.68

5.03

1.68

5.03

1.68

3.35

1.68

3.35

1.68

3.35

1.68

3.35

1.68

3.35

1.68

3.35

1.68

6.70

Appendix B. Real-time characterization

0.76

0.67

0.86

0.40

0.89

0.10

0.61

0.69

0.76

0.65

0.72

0.93

0.94

0.79

0.72

0.76

0.10

65% 65% Suspend [runnable->not runnable]

71% 26% Kill [runnable] thread

98% 50% Destroy [dead] thread

85% 14% Destroy [runnable] thread

53% 40% Resume [high priority] thread

96% 3% Thread switch

75% 75% Scheduler lock

71% 71% Scheduler unlock [0 threads]

64% 64% Scheduler unlock [1 suspended]

73% 73% Scheduler unlock [many suspended]

73% 73% Scheduler unlock [many low prio]

68% 68% Init mutex

96% 59% Lock [unlocked] mutex

96% 56% Unlock [locked] mutex

62% 62% Trylock [unlocked] mutex

68% 68% Trylock [locked] mutex

65% 65% Destroy mutex

96% 96% Unlock/Lock mutex

0.81

0.68

0.93

0.63

0.83

0.57

0.87

0.82

0.88

0.85

0.87

0.79

0.81

0.44

0.79

0.87

0.20

59% 40% Create mbox

71% 71% Peek [empty] mbox

96% 59% Put [first] mbox

75% 75% Peek [1 msg] mbox

53% 53% Put [second] mbox

78% 78% Peek [2 msgs] mbox

59% 59% Get [first] mbox

56% 56% Get [second] mbox

56% 56% Tryput [first] mbox

62% 62% Peek item [non-empty] mbox

59% 59% Tryget [non-empty] mbox

62% 62% Peek item [empty] mbox

59% 59% Tryget [empty] mbox

84% 84% Waiting to get mbox

62% 62% Waiting to put mbox

59% 59% Delete mbox

93% 6% Put/Get mbox

0.79

0.72

0.37

0.10

0.88

0.63

0.57

0.82

0.79

62% 62% Init semaphore

62% 62% Post [0] semaphore

62%

68% 68% Trywait [0] semaphore

68% 68% Trywait [1] semaphore

68% 68% Peek semaphore

87% 87% Destroy semaphore

96%

56%

62% Wait [1] semaphore

3% Post/Wait semaphore

56% Create counter

75% 75% Get counter value

78% 78% Set counter value

56% 56% Tick counter

62% 62% Delete counter

0.89

96% 50% Create alarm

0.84

100% 50% Initialize alarm

0.72

68% 68% Disable alarm

0.89

96% 50% Enable alarm

0.76

0.79

0.10

65% 65% Delete alarm

62% 62% Tick counter [1 alarm]

93% 3% Tick counter [many alarms]

202

Appendix B. Real-time characterization

0.94

0.00

11.16

10.06

5.19

0.01

0.13

0.94

1.75

5.03

0.00

1.68

11.73

6.70

1.68

3.35

6.70

0.82

0.76

0.28

0.03

0.24

0.85

0.15

56% 43% Tick & fire counter [1 alarm]

65% 34% Tick & fire counters [>1 together]

90% 90% Tick & fire counters [>1 separately]

99% 99% Alarm latency [0 threads]

92% 92% Alarm latency [2 threads]

53% 45% Alarm latency [many threads]

96% 96% Alarm -> thread resume latency

41 0 368 (main stack: 1036) Thread stack used (1712 total)

All done, main stack : stack used 1036 size 2912

All done : Interrupt stack used 368 size 4108

All done : Idlethread stack used 288 size 2048

Timing complete - 28520 ms total

PASS: < Basic timing OK>

EXIT: < done>

Board: NEC V850 Cosmo Evaluation Board

CPU: NEC CEB-V850/SA1 17MHz

Startup, main stack : stack used

Startup

552 size

: Interrupt stack used

2936

120 size 4096

Startup : Idlethread stack used 206 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 27 ‘ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 280.04 microseconds (1190 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

Ave Min Max

Confidence

Var Ave Min Function

====== ====== ====== ====== ========== ========

288.71

280.24

297.18

4.84

42% 28% Create thread

70.76

70.59

70.82

0.10

71% 28% Yield thread [all suspended]

59.06

60.00

77.38

77.18

3.13

3.06

59.06

60.00

77.41

3.29

187.46

187.29

187.53

70.76

70.59

70.82

0.00

100% 100% Suspend [suspended] thread

0.00

100% 100% Resume thread

0.06

0.10

85%

71%

14% Set priority

71% Get priority

71% 28% Kill [suspended] thread

71% 28% Yield [no other] thread

203

Appendix B. Real-time characterization

104.40

103.29

104.71

59.06

97.11

91.06

70.76

70.59

59.06

98.12

70.82

59.06

187.46

187.29

187.53

95.63

95.29

97.18

241.28

236.94

242.12

378.55

370.35

427.06

198.77

183.76

452.94

0.32

85% 14% Resume [suspended low prio] thread

0.00

100% 100% Resume [runnable low prio] thread

1.73

0.10

85%

71%

14% Suspend [runnable] thread

28% Yield [only low prio] thread

0.00

100% 100% Suspend [runnable->not runnable]

0.10

0.44

1.24

71%

85%

28% Kill [runnable] thread

85% Destroy [dead] thread

14% Destroy [runnable] thread

13.86

85% 85% Resume [high priority] thread

18.77

96% 96% Thread switch

2.59

41.29

41.18

40.82

40.71

41.29

41.18

41.29

41.18

2.59

41.41

40.94

41.41

17.94

17.88

68.71

72.10

72.00

18.12

68.71

73.41

57.88

52.24

57.88

52.24

12.41

12.24

12.47

427.06

0.00

0.12

0.09

100% 100% Scheduler lock

100%

50% Scheduler unlock [0 threads]

50% Scheduler unlock [1 suspended]

50% Scheduler unlock [many suspended]

50% Scheduler unlock [many low prio]

75% 75% Init mutex

0.00

100% 100% Lock [unlocked] mutex

0.15

96% 71% Unlock [locked] mutex

0.00

100% 100% Trylock [unlocked] mutex

0.00

100% 100% Trylock [locked] mutex

0.09

75% 25% Destroy mutex

0.00

100% 100% Unlock/Lock mutex

34.94

34.82

0.76

0.71

75.29

1.24

1.18

75.76

0.76

0.71

80.12

80.00

79.65

79.53

70.12

65.76

65.65

78.00

77.88

63.12

63.06

67.82

67.76

1.94

1.47

1.88

1.41

75.59

75.53

78.12

63.29

68.00

2.12

1.65

75.76

252.76

252.71

252.94

35.06

0.94

75.29

1.41

75.76

0.94

80.24

79.76

70.12

65.88

20.24

54.35

66.59

52.24

53.41

20.24

54.35

66.59

52.24

53.41

10.65

10.59

12.65

12.47

10.82

12.71

276.94

14.94

14.82

2.18

2.12

3.06

78.12

13.82

13.65

15.06

2.35

3.06

78.12

13.88

26.94

26.82

27.06

104.18

104.00

104.24

0.12

100% 50% Create mbox

0.09

75% 75% Peek [empty] mbox

0.00

100% 100% Put [first] mbox

0.09

75% 75% Peek [1 msg] mbox

0.00

100% 100% Put [second] mbox

0.09

75% 75% Peek [2 msgs] mbox

0.12

100% 50% Get [first] mbox

0.12

100% 50% Get [second] mbox

0.00

100% 100% Tryput [first] mbox

0.12

100% 50% Peek item [non-empty] mbox

0.12

100% 50% Tryget [non-empty] mbox

0.09

75% 75% Peek item [empty] mbox

0.09

75% 75% Tryget [empty] mbox

0.09

75%

75% Waiting to get mbox

75% Waiting to put mbox

75% Delete mbox

75% Put/Get mbox

0.00

100% 100% Init semaphore

0.00

100% 100% Post [0] semaphore

0.00

100% 100% Wait [1] semaphore

0.00

100% 100% Trywait [0] semaphore

0.00

100% 100% Trywait [1] semaphore

0.09

75%

75% Peek semaphore

25% Destroy semaphore

0.00

100% 100% Post/Wait semaphore

0.12

100% 50% Create counter

0.09

75% 75% Get counter value

0.00

100% 100% Set counter value

0.00

100% 100% Tick counter

0.09

75% 25% Delete counter

0.12

100% 50% Create alarm

0.09

75% 25% Initialize alarm

204

Appendix B. Real-time characterization

7.65

7.53

7.76

104.94

19.47

19.29

88.53

88.47

19.53

88.71

418.61

411.29

645.41

139.59

139.53

139.76

2150.21 2096.71 2367.53

478.15

462.35

733.41

219.89

218.59

369.88

292.11

218.59

371.53

292.96

218.59

370.59

540.90

495.76 1677.41

79.01

78.59

104.71

0.12

100% 50% Disable alarm

0.00

100% 100% Enable alarm

0.09

75%

25% Delete alarm

75% Tick counter [1 alarm]

14.17

96% 96% Tick counter [many alarms]

0.09

75% 75% Tick & fire counter [1 alarm]

83.59

78% 78% Tick & fire counters [>1 together]

29.61

93% 93% Tick & fire counters [>1 separately]

2.34

99% 99% Alarm latency [0 threads]

37.85

50% 25% Alarm latency [2 threads]

38.12

49% 25% Alarm latency [many threads]

17.76

98% 0% Alarm -> thread resume latency

0.00

Clock/interrupt latency

123.41

85.88 1982.82

0.00

Clock DSR latency

522 516 536 (main stack: 1124) Thread stack used (1912 total)

All done, main stack : stack used 1124 size 2936

All done : Interrupt stack used 288 size 4096

All done : Idlethread stack used 488 size 2048

Timing complete - 32540 ms total

Board: NEC V850 Cosmo Evaluation Board

CPU: NEC CEB-V850/SB1 16MHz (in internal Flash)

Startup, main stack

Startup

: stack used 572 size 2936

: Interrupt stack used 132 size 4096

: Idlethread stack used 210 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 8 ’ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 118.15 microseconds (472 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

Counters:

Alarms:

128

Ave Min Max

Confidence

Var Ave Min Function

====== ====== ====== ====== ========== ========

113.68

111.00

116.50

1.63

42% 28% Create thread

205

30.00

29.57

29.50

27.43

27.25

34.11

34.00

1.57

1.50

72.96

72.75

30.00

42.75

27.00

43.64

41.25

30.00

29.57

29.50

72.93

72.75

44.89

44.75

29.75

73.00

45.75

103.00

101.50

103.25

175.21

171.50

197.50

84.11

79.50

197.25

30.00

29.75

27.50

34.25

1.75

73.00

30.00

42.75

27.00

44.25

30.00

1.00

20.06

20.00

20.06

20.00

20.06

20.00

1.00

20.25

20.00

20.25

4.00

33.00

36.77

36.75

28.13

28.00

25.13

25.00

4.88

4.75

4.00

33.00

37.25

28.25

25.25

5.00

187.00

10.00

0.69

0.50

34.75

0.69

0.50

35.00

0.69

0.50

36.00

31.00

29.50

35.25

27.69

27.50

31.06

31.00

0.94

0.75

35.25

27.75

31.25

1.00

0.94

0.75

37.81

37.75

1.00

38.00

112.00

10.00

0.75

34.75

0.75

35.00

0.75

36.00

31.00

29.50

3.19

3.00

25.38

25.25

32.63

32.50

24.25

25.00

3.25

25.50

32.75

24.25

25.00

4.00

4.88

4.00

4.75

4.00

5.00

124.50

6.50

1.25

6.50

1.25

6.50

1.25

Appendix B. Real-time characterization

0.00

100% 100% Yield thread [all suspended]

0.10

71% 71% Suspend [suspended] thread

0.10

0.12

0.10

71%

57%

71%

28% Resume thread

57% Set priority

71% Get priority

0.06

85% 14% Kill [suspended] thread

0.00

100% 100% Yield [no other] thread

0.00

100% 100% Resume [suspended low prio] thread

0.00

100% 100% Resume [runnable low prio] thread

0.68

85% 14% Suspend [runnable] thread

0.00

100% 100% Yield [only low prio] thread

0.10

0.24

0.43

6.37

1.77

71% 71% Suspend [runnable->not runnable]

71% 28% Kill [runnable] thread

85% 85% Destroy [dead] thread

85% 14% Destroy [runnable] thread

85% 85% Resume [high priority] thread

98% 0% Thread switch

0.00

100% 100% Scheduler lock

0.09

75% 75% Scheduler unlock [0 threads]

0.00

100% 100% Scheduler unlock [1 suspended]

0.09

75% 75% Scheduler unlock [many suspended]

0.09

75% 75% Scheduler unlock [many low prio]

0.00

100% 100% Init mutex

0.00

100% 100% Lock [unlocked] mutex

0.03

96% 96% Unlock [locked] mutex

0.13

100% 50% Trylock [unlocked] mutex

0.13

100% 50% Trylock [locked] mutex

0.13

100% 50% Destroy mutex

0.00

100% 100% Unlock/Lock mutex

0.00

100% 100% Create mbox

0.09

75% 25% Peek [empty] mbox

0.00

100% 100% Put [first] mbox

0.09

75% 25% Peek [1 msg] mbox

0.00

100% 100% Put [second] mbox

0.09

75% 25% Peek [2 msgs] mbox

0.00

100% 100% Get [first] mbox

0.00

100% 100% Get [second] mbox

0.00

100% 100% Tryput [first] mbox

0.00

100% 100% Peek item [non-empty] mbox

0.00

100% 100% Tryget [non-empty] mbox

0.09

75% 25% Peek item [empty] mbox

0.09

75%

75% Tryget [empty] mbox

25% Waiting to get mbox

0.09

75%

25% Waiting to put mbox

75% Delete mbox

0.00

100% 100% Put/Get mbox

0.09

75% 25% Init semaphore

0.13

100% 50% Post [0] semaphore

0.13

100% 50% Wait [1] semaphore

0.00

100% 100% Trywait [0] semaphore

0.00

100% 100% Trywait [1] semaphore

0.00

100% 100% Peek semaphore

0.13

100% 50% Destroy semaphore

0.00

100% 100% Post/Wait semaphore

0.00

100% 100% Create counter

0.00

100% 100% Get counter value

206

Appendix B. Real-time characterization

1.44

1.25

36.25

5.25

1.50

36.25

5.25

12.25

49.13

49.00

2.81

2.75

48.50

12.25

49.25

3.00

48.50

8.25

46.50

8.25

46.50

485.42

482.25

580.00

64.00

1109.76 1100.50 1198.00

505.85

502.00

621.00

96.26

95.75

161.25

159.20

95.75

160.75

159.73

110.50

161.75

218.45

211.25

445.75

28.24

25.25

43.25

0.09

75% 25% Set counter value

0.00

100% 100% Tick counter

0.00

100% 100% Delete counter

0.00

100% 100% Create alarm

0.13

100% 50% Initialize alarm

0.09

75% 75% Disable alarm

0.00

100% 100% Enable alarm

0.00

100% 100% Delete alarm

0.00

100% 100% Tick counter [1 alarm]

5.91

96% 96% Tick counter [many alarms]

0.00

100% 100% Tick & fire counter [1 alarm]

16.53

90% 90% Tick & fire counters [>1 together]

7.20

96% 96% Tick & fire counters [>1 separately]

1.02

2.52

1.53

3.55

99% 99% Alarm latency [0 threads]

97% 0% Alarm latency [2 threads]

97% 0% Alarm latency [many threads]

97% 1% Alarm -> thread resume latency

0.00

Clock/interrupt latency

60.15

40.50

221.50

0.00

Clock DSR latency

472 424 572 (main stack: 1052) Thread stack used (1912 total)

All done, main stack

All done

: stack used

Interrupt stack used

: Idlethread stack used

1052 size

280 size

516 size

2936

4096

2048

Timing complete - 30590 ms total

PASS: < Basic timing OK>

EXIT: < done>

Board: ARM Industrial Module AIM711 (S3C4510)

CPU : S3C4510B (ARM7TDMI core), 50MHz

8MB RAM, 2MB Flash

Startup, main stack :

Startup

Startup stack used 82 size 2400

: Interrupt stack used 134 size 4096

: Idlethread stack used 91 size 2048 eCos Kernel Timings

Notes: all times are in microseconds (.000001) unless otherwise stated

Reading the hardware clock takes 33 ’ticks’ overhead

... this value will be factored out of all other measurements

Clock interrupt took 17.68 microseconds (884 raw clock ticks)

Testing parameters:

Clock samples:

Threads:

Thread switches:

Mutexes:

Mailboxes:

Semaphores:

Scheduler operations:

128

207

Appendix B. Real-time characterization

Counters:

Flags:

Alarms:

0.67

4.55

4.84

3.72

3.22

0.49

0.54

4.14

4.12

3.18

2.76

0.34

33.13

32.42

1.21

0.63

4.57

0.52

5.39

0.51

5.06

5.01

5.56

4.25

5.10

3.86

4.13

0.60

3.12

3.28

0.14

0.61

4.51

0.14

3.66

26.55

26.00

1.06

0.46

3.64

0.10

4.46

0.10

4.00

4.36

4.70

3.14

3.82

0.53

3.08

0.44

2.76

Ave Min Max Var

Confidence

Ave Min Function

====== ====== ====== ====== ========== ========

22.99

15.24

2.96

2.88

3.57

3.36

36.98

8.30

8.76

4.01

0.17

0.26

50%

98%

93%

26%

98%

71%

Create thread

Yield thread [all suspended]

Suspend [suspended] thread

3.64

5.44

0.77

3.00

4.78

0.20

14.46

12.40

2.95

2.88

6.73

5.40

8.74

15.10

1.98

33.02

7.44

15.60

0.33

0.42

0.25

1.03

0.14

0.44

65%

75%

59%

85%

20%

26%

17%

Resume thread

Set priority

Get priority

9% Kill [suspended] thread

98% 98% Yield [no other] thread

78% 6% Resume [suspended low prio] thread

3.59

5.77

2.97

2.98

4.78

2.88

3.40

2.86

14.15

12.08

11.00

9.74

20.35

17.72

23.77

21.02

8.40

8.30

7.18

13.46

8.86

6.26

30.54

23.38

43.00

45.38

15.38

0.28

0.44

0.18

0.26

1.09

0.75

1.26

1.59

0.18

56% 21% Resume [runnable low prio] thread

71% 18% Suspend [runnable] thread

98% 98% Yield [only low prio] thread

59% 17% Suspend [runnable->not runnable]

78% 23% Kill [runnable] thread

70% 31% Destroy [dead] thread

73% 14% Destroy [runnable] thread

68% 35% Resume [high priority] thread

89% 89% Thread switch

0.10

2.01

0.08

1.98

1.52

3.80

4.08

3.68

0.03

0.06

0.05

92% 92% Scheduler lock

92% 92% Scheduler unlock [0 threads]

92%

Scheduler unlock [1 suspended]

Scheduler unlock [many suspended]

Scheduler unlock [many low prio]

3.90

12.40

12.78

8.86

5.38

3.26

43.64

5.12

2.66

11.12

2.74

12.00

2.38

13.86

9.20

11.22

10.64

14.02

9.72

11.20

2.34

2.90

11.20

31.46

2.68

5.02

0.21

0.53

0.56

0.41

0.26

0.66

0.25

0.22

0.50

0.23

0.56

0.22

0.60

0.38

0.55

0.49

0.78

0.47

0.54

0.22

0.27

0.53

0.37

0.15

0.29

96% 96% Init mutex

96% 87% Lock [unlocked] mutex

65% 56% Unlock [locked] mutex

68% 56% Trylock [unlocked] mutex

65% 28% Trylock [locked] mutex

93% 84% Destroy mutex

90% 81% Unlock/Lock mutex

96% 96% Create mbox

96% 71% Peek [empty] mbox

75% 18% Put [first] mbox

62% 18% Peek [1 msg] mbox

75% 43% Put [second] mbox

62% 18% Peek [2 msgs] mbox

81% 18% Get [first] mbox

68% 25% Get [second] mbox

75% 37% Tryput [first] mbox

75% 9% Peek item [non-empty] mbox

78% 40% Tryget [non-empty] mbox

81% 21% Peek item [empty] mbox

87% 59% Tryget [empty] mbox

68% 9% Waiting to get mbox

78% 15% Waiting to put mbox

84% 50% Delete mbox

78% 40% Put/Get mbox

96%

43%

90%

46%

Init semaphore

Post [0] semaphore

208

Appendix B. Real-time characterization

3.64

3.08

2.72

0.85

0.80

3.20

2.66

2.62

0.52

0.34

21.87

21.54

1.18

0.69

0.26

3.73

0.79

1.04

0.52

0.14

3.24

0.36

7.72

7.40

5.88

3.30

3.74

25.64

4.92

2.84

1.76

5.62

3.58

0.40

0.39

0.20

0.32

0.39

0.28

0.24

0.18

0.14

0.19

53% 50% Wait [1] semaphore

50% 50% Trywait [0] semaphore

96% 96% Trywait [1] semaphore

50% 50% Peek semaphore

46% 37% Destroy semaphore

68% 65% Post/Wait semaphore

96% 96% Create counter

93% 71% Get counter value

78% 78% Set counter value

78% 12% Tick counter

78% 15% Delete counter

0.53

3.49

2.93

3.58

7.48

4.92

4.58

4.39

0.06

0.44

3.02

2.52

3.12

7.22

4.66

4.30

4.12

0.00

1.82

7.27

3.30

7.60

1.58

6.54

2.58

5.82

8.02

17.86

7.28

14.72

3.86

4.03

3.06

3.90

25.12

24.98

9.20

7.18

28.82

7.92

7.64

14.00

155.10

154.42

161.04

29.27

29.02

35.48

17.87

17.32

24.39

22.02

55.33

52.72

49.30

63.60

62.44

37.98

36.54

170.56

3.06

9.28

7.42

9.38

12.90

11.22

11.66

11.02

1.40

0.17

0.45

0.39

0.46

0.35

0.39

0.44

0.43

0.11

0.40

0.77

0.60

0.84

0.67

0.23

0.24

0.40

0.37

0.42

0.56

1.43

1.11

2.17

96%

53% 50% Destroy flag

50% 46% Mask bits in flag

50% 50% Set bits in flag [no waiters]

96% 96% Wait for flag [AND]

96% 96% Wait for flag [OR]

96% 96% Wait for flag [AND/CLR]

96% 96% Wait for flag [OR/CLR]

87% 87% Peek on flag

96%

67%

97%

90%

96%

Init flag

93% 87% Initialize alarm

56% 71% Disable alarm

81% 12% Enable alarm

53% 65% Delete alarm

96% 90% Tick counter [1 alarm]

96% 93% Tick counter [many alarms]

96% 96% Tick & fire counter [1 alarm]

90% 6% Tick & fire counters [>1 together]

96% 93% Tick & fire counters [>1 separately]

98% 97% Alarm latency [0 threads]

57% 19% Alarm latency [2 threads]

20%

97%

Create alarm

Alarm latency [many threads]

Alarm -> thread resume latency

29 0 259 (main stack: 805) Thread stack used (1120 total)

All done, main stack :

All done : stack used

Interrupt stack used

805 size

163 size

2400

4096

All done : Idlethread stack used 239 size 2048

Timing complete - 28880 ms total

PASS: < Basic timing OK>

EXIT: < done>

209

Appendix C. GNU General Public License

59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.

Preamble

The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU General Public

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When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for this service if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs; and that you know you can do these things.

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We protect your rights with two steps: (1) copyright the software, and

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Also, for each author’s protection and ours, we want to make certain that everyone understands that there is no warranty for this free software. If the software is modified by someone else and passed on, we want its recipients to know that what they have is not the original, so that any problems introduced by others will not reflect on the original authors’ reputations.

Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors of a free program will individually obtain patent licenses, in effect making the

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The precise terms and conditions for copying, distribution and modification follow.

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Program), the recipient automatically receives a license from the original licensor to copy, distribute or modify the Program subject to these terms and conditions. You may not impose any further restrictions on the recipients’ exercise of the rights granted herein.

You are not responsible for enforcing compliance by third parties to this License.

7. If, as a consequence of a court judgment or allegation of patent infringement or for any other reason (not limited to patent issues), conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot distribute so as to satisfy simultaneously your obligations under this

License and any other pertinent obligations, then as a consequence you may not distribute the Program at all. For example, if a patent license would not permit royalty-free redistribution of the Program by all those who receive copies directly or indirectly through you, then the only way you could satisfy both it and this License would be to refrain entirely from distribution of the Program.

213

Appendix C. GNU General Public License

If any portion of this section is held invalid or unenforceable under any particular circumstance, the balance of the section is intended to apply and the section as a whole is intended to apply in other circumstances.

It is not the purpose of this section to induce you to infringe any patents or other property right claims or to contest validity of any such claims; this section has the sole purpose of protecting the integrity of the free software distribution system, which is implemented by public license practices. Many people have made generous contributions to the wide range of software distributed through that system in reliance on consistent application of that system; it is up to the author/donor to decide if he or she is willing to distribute software through any other system and a licensee cannot impose that choice.

This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License.

8. If the distribution and/or use of the Program is restricted in certain countries either by patents or by copyrighted interfaces, the original copyright holder who places the Program under this License may add an explicit geographical distribution limitation excluding those countries, so that distribution is permitted only in or among countries not thus excluded. In such case, this License incorporates the limitation as if written in the body of this License.

9. The Free Software Foundation may publish revised and/or new versions of the General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns.

Each version is given a distinguishing version number. If the Program specifies a version number of this License which applies to it and "any later version", you have the option of following the terms and conditions either of that version or of any later version published by the Free

Software Foundation. If the Program does not specify a version number of this License, you may choose any version ever published by the Free Software

Foundation.

10. If you wish to incorporate parts of the Program into other free programs whose distribution conditions are different, write to the author to ask for permission. For software which is copyrighted by the Free

Software Foundation, write to the Free Software Foundation; we sometimes make exceptions for this. Our decision will be guided by the two goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of software generally.

NO WARRANTY

11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY

214

Appendix C. GNU General Public License

FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN

OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES

PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED

OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS

TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE

PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,

REPAIR OR CORRECTION.

12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING

WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR

REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,

INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING

OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED

TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY

YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER

PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE

POSSIBILITY OF SUCH DAMAGES.

END OF TERMS AND CONDITIONS

How to Apply These Terms to Your New Programs

If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms.

To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software

Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Also add information on how to contact you by electronic and paper mail.

215

Appendix C. GNU General Public License

If the program is interactive, make it output a short notice like this when it starts in an interactive mode:

Gnomovision version 69, Copyright (C) year name of author

Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type ‘show w’.

This is free software, and you are welcome to redistribute it under certain conditions; type ‘show c’ for details.

The hypothetical commands ‘show w’ and ‘show c’ should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than ‘show w’ and ‘show c’; they could even be mouse-clicks or menu items--whatever suits your program.

You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names:

Yoyodyne, Inc., hereby disclaims all copyright interest in the program

‘Gnomovision’ (which makes passes at compilers) written by James Hacker.

<signature of Ty Coon>, 1 April 1989

Ty Coon, President of Vice

This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Library General

Public License instead of this License.

216

Reklama

eCos User Guide

Table of Contents

List of Tables

List of Figures

List of Examples

I. Introduction

Chapter 1. Key Features

Chapter 2. eCos Overview

Chapter 3. eCos Licence Overview

Questions and answers

Previous License

Chapter 4. Notation and Conventions

GDB and GCC Command Notation

Directory and File System Conventions

Version Conventions

Chapter 5. Documentation Roadmap

II. Installing eCos

Chapter 6. System Requirements

Chapter 7. Installation on Linux

Chapter 8. Installation on Windows

Chapter 9. Target Setup

Connecting Via Serial Line

Connecting Via Ethernet

Using A Simulator Target

Using A Synthetic Target

III. Programming With eCos

Chapter 10. Programming With eCos

The Development Process

eCos Configuration

Integrity check of the eCos configuration

Application Development - Target Neutral Part

Application Development - Target Specific Part

Chapter 11. Configuring and Building eCos from

Source

eCos Start-up Configurations

Caution

Configuration Tool on Windows and Linux Quick Start

Ecosconfig on Windows and Linux Quick Start

Selecting a Target

Caution

Chapter 12. Running an eCos Test Case

Using the Configuration Tool

Using the command line

Testing Filters

Chapter 13. Building and Running Sample

Applications

eCos Hello World

eCos hello world program listing

A Sample Program with Two Threads

eCos two-threaded program listing

Chapter 14. More Features — Clocks and Alarm

Handlers

A Sample Program with Alarms

IV. The eCos Configuration Tool

Chapter 15. Getting Started

Introduction

Invoking the eCos Configuration Tool

On Linux

On Windows

The Component Repository

eCos Configuration Tool Documents

Configuration Save File

Save the currently active document

Open an existing document

Open a document you have used recently

Create a new blank document based on the Component Registry

Save to a different file name

Build and Install Trees

Chapter 16. Getting Help

Context-sensitive Help for Dialogs

Context-sensitive Help for Other Windows

Context-sensitive Help for Configuration Items

Methods of Displaying HTML Help

Chapter 17. Customization

Window Placement

Settings

Settings: Display tab

Labels

Integer Items

Font