[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 7ff213f..1f5f7d2 100644
--- a/Documentation/kdump/kdump.txt
+++ b/Documentation/kdump/kdump.txt
@@ -39,8 +39,7 @@
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 @@
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.