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Commit 952b6492 authored by Vivek Goyal's avatar Vivek Goyal Committed by Linus Torvalds
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[PATCH] Kdump: Documentation Update 



There are minor changes in command line options in kexec-tools for kdump.
This patch updates the documentation to reflect those changes.

Signed-off-by: default avatarVivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 9d01a82e

Documentation/kdump/kdump.txt

+8 −8
Original line number Diff line number Diff line
@@ -39,8 +39,7 @@ SETUP 
   and apply http://lse.sourceforge.net/kdump/patches/kexec-tools-1.101-kdump.patch

   and after that build the source.



2) Download and build the appropriate (latest) kexec/kdump (-mm) kernel

   patchset and apply it to the vanilla kernel tree.

2) Download and build the appropriate (2.6.13-rc1 onwards) vanilla kernel.



   Two kernels need to be built in order to get this feature working.
@@ -84,15 +83,16 @@ SETUP 


4) Load the second kernel to be booted using:



   kexec -p <second-kernel> --crash-dump --args-linux --append="root=<root-dev>

   init 1 irqpoll"

   kexec -p <second-kernel> --args-linux --elf32-core-headers

   --append="root=<root-dev> init 1 irqpoll"



   Note: i) <second-kernel> has to be a vmlinux image. bzImage will not work,

	    as of now.

	ii) By default ELF headers are stored in ELF32 format (for i386). This

	    is sufficient to represent the physical memory up to 4GB. To store

	    headers in ELF64 format, specifiy "--elf64-core-headers" on the

	    kexec command line additionally.

	ii) By default ELF headers are stored in ELF64 format. Option

	    --elf32-core-headers forces generation of ELF32 headers. gdb can

	    not open ELF64 headers on 32 bit systems. So creating ELF32

	    headers can come handy for users who have got non-PAE systems and

	    hence have memory less than 4GB.

       iii) Specify "irqpoll" as command line parameter. This reduces driver

            initialization failures in second kernel due to shared interrupts.