[PATCH] kexec: powerpc: crash_dump: No backup region for PPC BookE

Suzuki Poulose suzuki at in.ibm.com
Mon Oct 3 23:26:49 EDT 2011

On 10/04/11 08:51, Suzuki Poulose wrote:
> On 10/03/11 23:53, McClintock Matthew-B29882 wrote:
>> On Mon, Oct 3, 2011 at 5:18 AM, Suzuki K. Poulose<suzuki at in.ibm.com> wrote:
>>> Disable backup regions for BookE in case of a CRASH Dump, as they can
>>> be run from anywhere.
>>> The patch introduces --with-booke option to support the BookE.
>>> With the patch, we get :
>>> ## On a 256M machine:
>>> # busybox cat /proc/cmdline
>>> init=/bin/init console=ttyS0,16550 crashkernel=128M at 100M
>>> # kexec -p root/vmlinux
>>> usable memory rgns size:1 base:6400000 size:8000000
>>> 0000000000000000-0000000006400000
>>> 000000000e400000-0000000010000000
>>> Command line after adding elfcorehdr: elfcorehdr=112380K
>>> Command line after adding elfcorehdr: elfcorehdr=112380K savemaxmem=256M
>> So there were two crash regions when we only needed the one specified
>> on the command line?
> Yes, and isn't that is expected ? The first kernel uses the memory region
> (0-100M), (228M,256M). Where the 100-228M is reserved for crash kernel.

The CRASH MEMORY RANGES denotes the memory ranges of the crashed kernel and
usable memory regions denote the memory usable by the second kernel.


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