kexec support in LinuxSH

Kexec support in LinuxSH †

• kexec kernel support patch for linux-2.6.13-sh
  
  • apply this patch
    
    • linux-2.6.13-sh-kexec.patch
      This patch was merged into sh--stable--2.6 in LinuxSH.
      
      
  • set kernel config option
    • Kernel features -> kexec system call
      
      

• kexec-tools
  • binary and source
    • kexec-tools_1.101-sh.tgz
      
      
  • linux-zImage kernel boot support
    • append option support.
    • When the append option is not specified, /proc/cmdline is used.
      
  • NetBSD-elf Kernel boot support from Linux's kexec.
    • howto option support.
    • miniroot (ramdisk root file system) support.
      
      
• debian binary package installation

  landisk:~# apt-get install kernel-image-2.6.13-sh kexec-tools
  

• kexec command help

  landisk:~# kexec 
  No kernel specified
  kexec 1.99 released 21 December 2004
  Usage: kexec [OPTION]... [kernel]
  Directly reboot into a new kernel
  
   -h, --help           Print this help.
   -v, --version        Print the version of kexec.
   -f, --force          Force an immediate kexec, don't call shutdown.
   -x, --no-ifdown      Don't bring down network interfaces.
                        (if used, must be last option specified)
   -l, --load           Load the new kernel into the current kernel.
   -p, --load-panic     Load the new kernel for use on panic.
   -u, --unload         Unload the current kexec target kernel.
   -e, --exec           Execute a currently loaded kernel.
   -t, --type=TYPE      Specify the new kernel is of this type.
       --mem-min=<addr> Specify the lowest memory addres to load code into.
       --mem-max=<addr> Specify the highest memory addres to load code into.
  
  Supported kernel file types and options: 
  zImage-sh
   --append=STRING      Set the kernel command line to STRING.
   --empty-zero=ADDRESS Set the kernel top ADDRESS. 
  
  netbsd-sh
   --howto=VALUE        NetBSD kernel boot option.
   --miniroot=FILE      NetBSD miniroot ramdisk.
  
  Architecture options: 
   none
  
  Default options:
   --append="ro root=303 mem=64M console=ttySC1,9600"
   --empty-zero=0x0c001000
  
   STRING of --appned is set form /proc/cmdline as default.
   ADDRESS of --empty-zero can be set SHELL environment variable
   KEXEC_EMPTY_ZERO as default.
  
   ADDRESS can be get in the following method in your system. 
   1) "grep empty_zero /proc/kallsyms". 
   2) "grep empty_zero System.map". 
   3) CONFIG_MEMORY_START + CONFIG_ZERO_PAGE_OFFSET in your kernel
      config file.
  
  

• example1 -- kexec linux kernel

  landisk:~# kexec --append="mem=64M console=ttySC1,9600 root=/dev/hda3 ro" /boot/zImage
  

• example2 -- kexec NetBSD kernel (sample kernel of LANDISK and ramdisk image)

  landisk:~# kexec --miniroot=miniroot.img netbsd-RAMDISK
  

• note
  shutdown command is called from kexec command automatically. Therefore, it is safe.
  
  
• Appendix
  linux and tools for LANDISK(SH4)
  
  
  My English is very poor. Please edit it freely.
  
  

kexec support in linux-2.4.21-iodata †

• kexec kernel support patch for linux-2.4.21-iodata
  
  • apply this patch
    
    • linux-2.4.21-iodata-kexec.patch
      
      
  • set kernel config option
    • Kernel hacking -> kexec system call