Advantech RSB-4210 Evaluation Kit Instrukcja Użytkownika Pobierz pdf (Strona 48)

RSB-4210 User Manual 40

 boot' → The startup files and the kernel. In some recent distributions also grub

data. Grub is the Grand Unified Boot loader and is an attempt to get rid of the

many different boot-loaders we know today.

 dev'

→ Contains references to all the CPU peripheral hardware, which are rep-

resented as files with special properties.

 etc'

→ Most important system configuration files are in /etc, this directory con-

tains 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.

 lost+found'

→ Every partition has a lost+found in its upper directory. Files that

were saved during failures are here.

 mnt'

→ Standard mount point for external file systems.

 opt'Typically contains extra and third party software.

 proc'

→ A virtual file system containing information about system resources.

More information about the meaning of the files in proc is obtained by entering

the command man proc in a terminal window. The file proc.txt discusses the vir-

tual file system in detail.

 root'

→ The administrative user's home directory. Mind the difference between /,

the root directory and /root, the home directory of the root user.

 sbin'

→ Programs for use by the system and the system administrator.

 tmp'

→ Temporary space for use by the system, cleaned upon reboot, so doesn't

use this for saving any work!

 usr'

→ Programs, libraries, documentation etc. for all user-related programs.

 var'

→ Storage for all variable files and temporary files created by users, such as

log files, the mail queue, the print spooler area, space for temporary storage of

files downloaded from the Internet.

3.2.2.4 Scripts

Some scripts developed by Advantech will help you configure system or build the

images more quickly. Please check them as follows:

 setenv.sh

→ A script to setup the developing environment quickly.

 cfg_kernel.sh

→ A script to configure the kernel building setup quickly.

 mk_kernel.sh

→ A script to build the kernel(uImage) and copy the "uImage" to

"image" and "mk_inand" folders after building.

 cfg_uboot.sh

→ A script to configure the u-boot building setup quickly.

 mk_uboot.sh

→ A script to build the u-boot(u-boot.bin) and copy the "u-boot.bin"

to "image" and "mk_inand" folders after building.

3.2.2.5 Source

The source folder contains folder- "linux-2.6.35.3". It is the source code for Linux ker-

nel image.

Linux is a clone of the operating system UNIX. It has all the features you would

expect in a modern fully-fledged UNIX, including true multitasking, virtual memory,

shared libraries, demand loading, shared copy-on-write executables, proper memory

management, and multitask networking including IPv4 and IPv6.

Linux is easily portable to most general-purpose 32- or 64-bit architectures as long as

they have a paged memory management unit (PMMU) and a port of the GNU C com-

piler (gcc) (part of The GNU Compiler Collection, GCC). Linux has also been ported

to a number of architectures without a PMMU, although functionality is then obviously

somewhat limited. Linux has also been ported to itself. You can now run the kernel as

a user space application - this is called User Mode Linux (UML).

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