Booting Process

• boot splashing system
  • bootsplash
  • Splashy

• Command line
  • Linux Command Line Parameters
  • 9. Kernel Boot Command-Line Parameter Reference

nfs root file system

• NFS-Root mini-HOWTO
• Mounting the root filesystem via NFS (nfsroot)
• Documentation / filesystems / nfsroot.txt

root=/dev/nfs rootfstype=nfs rw nfsroot=[<server-ip>:]<root-dir>[,<nfs-options>] ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>

• The <autoconf> parameter can appear alone as the value to the ‘ip’ parameter (without all the ':' characters before). If the value is "ip=off" or "ip=none", no autoconfiguration will take place, otherwise autoconfiguration will take place. The most common way to use this is "ip=dhcp".

• eXecute In Place(XIP)
  • SDCS uClinux Training ... eXecute In Place
  • Documentation / filesystems / xip.txt
  • Kernel XIP
  • 14.3.25. Configure Linux for XIP (Execution In Place)

• Boot Code

0.01

• linux/boot/boot.s
  • linux內核原代碼boot.s部分的注釋
  • 系统初始化程序 boot.s 的分析
• linux/boot/head.s
• linux/init/main.c

0.12

2.4

• 2.4.20
  • Linux i386 Boot Code HOWTO
    • linux/arch/i386/boot/bootsect.S
    • linux/arch/i386/boot/compressed/head.S
    • linux/arch/i386/kernel/head.S
    • linux/arch/i386/boot/setup.S
    • linux/init/main.c

• Linux 2.4.x Initialization for IA-32
• Linux Kernel 2.4 Internals - Booting

2.6

linux/arch/xxx/kernel/head.S

linux/init/main.c

• start_kernel(void)
  • rest_init();
    • kernel_thread(init, NULL, CLONE_FS | CLONE_SIGHAND);

• init(void)
  • prepare_namespace(); // do_mounts.c
    • initrd_load(); // do_mounts_initrd.c
  • run_init_process(execute_command);
  • run_init_process("/sbin/init");
  • run_init_process("/etc/init");
  • run_init_process("/bin/init");
  • run_init_process("/bin/sh");