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[PATCH] More documentation, minor cleanup in kdump.txt

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Added clarification on the root device format to be used for second kernel,
as well as specifying initrd if drivers are built as modules.

Signed-off-by: Kishore Sampathkumar <kishore.sampathkumar@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Vivek Goyal 2005-09-13 01:25:47 -07:00 committed by Linus Torvalds
parent f4f9eb0ea1
commit 64ccd0cfa1
1 changed files with 8 additions and 3 deletions
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11
Documentation/kdump/kdump.txt
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@ -66,11 +66,11 @@ SETUP
c) Enable "/proc/vmcore support" (Optional, in Pseudo filesystems).
CONFIG_PROC_VMCORE=y
d) Disable SMP support and build a UP kernel (Until it is fixed).
CONFIG_SMP=n
CONFIG_SMP=n
e) Enable "Local APIC support on uniprocessors".
CONFIG_X86_UP_APIC=y
CONFIG_X86_UP_APIC=y
f) Enable "IO-APIC support on uniprocessors"
CONFIG_X86_UP_IOAPIC=y
CONFIG_X86_UP_IOAPIC=y
Note: i) Options a) and b) depend upon "Configure standard kernel features
(for small systems)" (under General setup).
@ -95,6 +95,11 @@ SETUP
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.
iv) <root-dev> needs to be specified in a format corresponding to
the root device name in the output of mount command.
v) If you have built the drivers required to mount root file
system as modules in <second-kernel>, then, specify
--initrd=<initrd-for-second-kernel>.
5) System reboots into the second kernel when a panic occurs. A module can be
written to force the panic or "ALT-SysRq-c" can be used initiate a crash