Section 6.7. Chapter Summary


6.7. Chapter Summary

  • A root file system is required for all Linux systems. They can be difficult to build from scratch because of complex dependencies by each application.

  • The File System Hierarchy standard provides guidance to developers for laying out a file system for maximum compatibility and flexibility.

  • We presented a minimal file system as an example of how root file systems are created.

  • The Linux kernel's final boot steps define and control a Linux system's startup behavior. Several mechanisms are available depending on your embedded Linux system's requirements.

  • The init process was presented in detail. This powerful system-configuration and control utility can serve as the basis for your own embedded Linux system. System initialization based on init was presented, along with example startup script configurations.

  • Initial ramdisk is a Linux kernel feature to allow further startup behavior customization before mounting a final root file system and spawning init. We presented the mechanism and example configuration for using this powerful feature.

  • initramfs simplifies the initial ramdisk mechanism, while providing similar early startup facilities. It is easier to use, does not require loading a separate image, and is built automatically during each kernel build.

6.7.1. Suggestions for Additional Reading

File System Hierarchy Standard
Maintained by freestandards.org
www.pathname.com/fhs/

Boot Process, Init and Shutdown
Linux Documentation Project
http://tldp.org/LDP/intro-linux/html/sect_04_02.html

Init man page
Linux Documentation Project
http://tldp.org/LDP/sag/html/init.html

A brief description of System V init
http://docs.kde.org/en/3.3/kdeadmin/ksysv/what-is-sysv-init.html

Booting Linux: The History and the Future
Werner Almesberger
www.almesberger.net/cv/papers/ols2k-9.ps



Embedded Linux Primer(c) A Practical Real-World Approach
Embedded Linux Primer: A Practical Real-World Approach
ISBN: 0131679848
EAN: 2147483647
Year: 2007
Pages: 167

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