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Figure 3.1 Source Code Package Structure
The AM335XLBVxxxx package contents are as follows:
“cross_compiler” → This folder contains source code for the cross compiler.
“document”
“image”
“image/rootfs”
→ This folder contains the user guide.
→ This folder contains the zImage and u-boot.img.
→ This folder contains the Linux root file system.
“package”
“scripts”
“source”
→ This folder contains source code provided by TI without any modification.
→ This folder contains scripts for the system configuration and automatic image compilation.
→ This folder contains source code owned by Advantech.
3.2.2.1
Cross_compiler
The cross compiler tool chain can be used to compile the zImage and related applications (gcc version 4.9.3 20150413).
3.2.2.2
Document
This folder contains the user guide, which describes how to setup a development environment.
3.2.2.3
Image
This folder contains the zImage and u-boot.img.
3.2.2.4
Image/rootfs
Linux adopts a hierarchical file system (HFS). Image/rootfs is the Linux file system at the highest level of the file structure, similar to the trunk of a tree. The subdirectories are branches, and the files inside these subdirectories are the leaves. Image/rootfs contains all the subdirectories and files used by the file system, which is why it is known as the root of the entire file system.
The main folders in “rootfs” are listed below.
– bin
– dev
– etc
– home
– lib
– mnt
– opt
→ Common programs shared by the system, system administrator, and users.
→ Contains references to all CPU peripheral hardware, which are represented as files with special properties.
→ Contains the most important system configuration files, similar to that in the Windows Control Panel.
→ Home directories of the frequent users.
→ Contains library files, including those for all types of programs required by the system and users.
→ Standard mount point for external file systems.
→ Typically contains extra and third-party software.
35 RSB-4220 User Manual
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