Commit 64ccd0cf authored by Vivek Goyal's avatar Vivek Goyal Committed by Linus Torvalds
Browse files

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



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: default avatarKishore Sampathkumar <kishore.sampathkumar@hp.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent f4f9eb0e
...@@ -66,11 +66,11 @@ SETUP ...@@ -66,11 +66,11 @@ SETUP
c) Enable "/proc/vmcore support" (Optional, in Pseudo filesystems). c) Enable "/proc/vmcore support" (Optional, in Pseudo filesystems).
CONFIG_PROC_VMCORE=y CONFIG_PROC_VMCORE=y
d) Disable SMP support and build a UP kernel (Until it is fixed). 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". e) Enable "Local APIC support on uniprocessors".
CONFIG_X86_UP_APIC=y CONFIG_X86_UP_APIC=y
f) Enable "IO-APIC support on uniprocessors" 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 Note: i) Options a) and b) depend upon "Configure standard kernel features
(for small systems)" (under General setup). (for small systems)" (under General setup).
...@@ -95,6 +95,11 @@ SETUP ...@@ -95,6 +95,11 @@ SETUP
hence have memory less than 4GB. hence have memory less than 4GB.
iii) Specify "irqpoll" as command line parameter. This reduces driver iii) Specify "irqpoll" as command line parameter. This reduces driver
initialization failures in second kernel due to shared interrupts. 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 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 written to force the panic or "ALT-SysRq-c" can be used initiate a crash
......
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