Advantech RSB-4220, Руководство пользователя

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37 RSB-4220 User Manual
Chapter 3
S
oftware
Functionality
Figure 3.1 Source code package structure
The description of 335XLBVxxxx package contents:
3.2.2.1 cross_compiler
You can use the cross compiler tool chain to compile the uImage and related applica-
tions. (gcc version is 4.7.3 20130226)
3.2.2.2 document
User guide of how to setup up the environment of development
3.2.2.3 image
This folder includes uImage & u-boot.img.
3.2.2.4 image/rootfs
Linux adopts Hierarchical File System (HFS), image/rootfs is the Linux file system in
highest level of the tree structure. image/rootfs is just like the trunk of the tree. Its
sub-directories are the branches and the files in these directories are the leaves of
the tree. image/rootfs contains all subdirectories and files used in the file system,
that’s why it is called the root of the whole file system.
The main folders in “rootfs” are listed as follows:

“cross_compiler”
→
This folder contains source code for cross compiler.

“document”
→
This folder contains user guide.

“image”
→
This folder contains the uImage, u-boot.img

“image/rootfs”
→
This folder contains Linux root file system

“package”
→
This folder contains source code provided by TI without any
modification

“scripts”
→
This folder contains scripts for configure system and compile
images automatically.

“source”
→
This folder contains source code owned by Advantech.
– bin →
Common programs, shared by the system, the system adminis-
trator and the users.
– dev →
Contains references to all the CPU peripheral hardware, which
are represented as files with special properties.
– etc →
Most important system configuration files are in /etc, this direc-
tory contains data similar to those in the Control Panel in Windows
– home
→
Home directories of the common users.
– lib →
Library files, includes files for all kinds of programs needed by
the system and the users.
– mnt →
Standard mount point for external file systems.
– opt →
Typically contains extra and third party software.