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Date: Tue, 04 Oct 2011 08:51:19 +0530
From: Suzuki Poulose <suzuki@in.ibm.com>
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Subject: Re: [PATCH] kexec: powerpc: crash_dump: No backup region for PPC BookE
References: <20111003101746.30979.44424.stgit@suzukikp.in.ibm.com>
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To: McClintock Matthew-B29882 <B29882@freescale.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>, Simon Horman <horms@verge.net.au>, Mahesh Jagannath Salgaonkar <mahesh@linux.vnet.ibm.com>, "kexec@lists.infradead.org" <kexec@lists.infradead.org>, "M. Mohan Kumar" <mohan@in.ibm.com>, Vivek Goyal <vgoyal@redhat.com>

On 10/03/11 23:53, McClintock Matthew-B29882 wrote:
> On Mon, Oct 3, 2011 at 5:18 AM, Suzuki K. Poulose<suzuki@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@100M
>> # kexec -p root/vmlinux
>> usable memory rgns size:1 base:6400000 size:8000000
>> CRASH MEMORY RANGES
>> 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.

Thanks
Suzuki

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