[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.
 
-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.