The patch titled
PPC64 Kdump documentation update
has been added to the -mm tree. Its filename is
ppc64-kdump-documentation-update-for-2620.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: PPC64 Kdump documentation update
From: Simon Horman <horms@xxxxxxxxxxxx>
Patch from Mohan Kumar M to add the ppc64 portions of the kdump
documentation.
http://thread.gmane.org/gmane.linux.kernel/481689/focus=3375
Cc: Mohan Kumar M <mohan@xxxxxxxxxx>
Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/kdump/kdump.txt | 24 +++++++++++++-----------
1 files changed, 13 insertions(+), 11 deletions(-)
diff -puN Documentation/kdump/kdump.txt~ppc64-kdump-documentation-update-for-2620 Documentation/kdump/kdump.txt
--- a/Documentation/kdump/kdump.txt~ppc64-kdump-documentation-update-for-2620
+++ a/Documentation/kdump/kdump.txt
@@ -30,6 +30,10 @@ On x86 machines, the first 640 KB of phy
regardless of where the kernel loads. Therefore, kexec backs up this
region just before rebooting into the dump-capture kernel.
+Similarly on PPC64 machines first 32KB of physical memory is needed for
+booting regardless of where the kernel is loaded and to support 64K page
+size kexec backs up the first 64KB memory.
+
All of the necessary information about the system kernel's core image is
encoded in the ELF format, and stored in a reserved area of memory
before a crash. The physical address of the start of the ELF header is
@@ -224,7 +228,7 @@ Dump-capture kernel config options (Arch
Dump-capture kernel config options (Arch Dependent, ppc64)
----------------------------------------------------------
-- Make and install the kernel and its modules. DO NOT add this kernel
+* Make and install the kernel and its modules. DO NOT add this kernel
to the boot loader configuration files.
Dump-capture kernel config options (Arch Dependent, ia64)
@@ -251,8 +255,8 @@ Dump-capture kernel config options (Arch
Boot into System Kernel
=======================
-1) Make and install the kernel and its modules. Update the boot loader
- (such as grub, yaboot, or lilo) configuration files as necessary.
+1) Update the boot loader (such as grub, yaboot, or lilo) configuration
+ files as necessary.
2) Boot the system kernel with the boot parameter "crashkernel=Y@X",
where Y specifies how much memory to reserve for the dump-capture kernel
@@ -356,10 +360,11 @@ If die() is called, and it happens to be
is called inside interrupt context or die() is called and panic_on_oops is set,
the system will boot into the dump-capture kernel.
-On powererpc systems when a soft-reset is generated, die() is called by all cpus and the system will boot into the dump-capture kernel.
+On powererpc systems when a soft-reset is generated, die() is called by all cpus
+and the system will boot into the dump-capture kernel.
For testing purposes, you can trigger a crash by using "ALT-SysRq-c",
-"echo c > /proc/sysrq-trigger or write a module to force the panic.
+"echo c > /proc/sysrq-trigger" or write a module to force the panic.
Write Out the Dump File
=======================
@@ -410,12 +415,9 @@ format. Crash is available on Dave Ander
To Do
=====
-1) Provide a kernel pages filtering mechanism, so core file size is not
- extreme on systems with huge memory banks.
-
-2) Relocatable kernel can help in maintaining multiple kernels for
- crash_dump, and the same kernel as the system kernel can be used to
- capture the dump.
+1) Provide relocatable kernels for all architectures to help in maintaining
+ multiple kernels for crash_dump, and the same kernel as the system kernel
+ can be used to capture the dump.
Contact
_
Patches currently in -mm which might be from horms@xxxxxxxxxxxx are
origin.patch
git-ia64.patch
ia64-point-saved_max_pfn-to-the-max_pfn-of-the-entire-system.patch
update-osdl-linux-foundation-maintainer-addresses.patch
ppc64-kdump-documentation-update-for-2620.patch
-
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