[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: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
index 7ff213f4becd34d1f2a378c77f427aa3ac9c8033..1f5f7d28c9e6bf54e2b95d97f9399aed324b177f 100644 (file)
--- a/Documentation/kdump/kdump.txt
+++ b/Documentation/kdump/kdump.txt
@@ -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.
 
    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.
 
 
    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:
 
 
 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.
 
    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.
 
        iii) Specify "irqpoll" as command line parameter. This reduces driver
             initialization failures in second kernel due to shared interrupts.