Re: Fwd: Kexec support for PS3 (ppc64)

From: Mohan Kumar M <mohan@in.ibm.com>
To: Rajasekaran P <rajasekaran83@gmail.com>
Cc: kexec@lists.infradead.org, Geoff Levand <geoffrey.levand@am.sony.com>
Subject: Re: Fwd: Kexec support for PS3 (ppc64)
Date: Fri, 14 Mar 2008 16:32:12 +0530	[thread overview]
Message-ID: <20080314110212.GA9643@in.ibm.com> (raw)
In-Reply-To: <4574cb3d0803140336g59236cf2w7e14405b2dc795a5@mail.gmail.com>

On Fri, Mar 14, 2008 at 03:36:58AM -0700, Rajasekaran P wrote:
> On Tue, Mar 11, 2008 at 11:48 AM, Geoff Levand <geoffrey.levand@am.sony.com>
> wrote:
> 
> Initially I made mistake by referring /proc/meminfo and thought the total
> RAM was > 200M iB (actually it shows around 211MiB in /proc/meminfo
> excluding swap space). But actual available memory is 128MiB only. Thats why
> reserving 128MiB on 32MiB failed and kernel was not booting up.
> 
> Now "crashkernel" argument works properly for 64MB@64MB and kernel reserves
> 64MB for crash dump capture kernel.

In PPC64, crashkernel base address is hard coded i.e it is always loaded
at 32MB, even though you have passed 64MB@64MB. Did you get any warning
message like crashkernel reserved at 32MB?

> 
> This memory is reserved for "dump capture kernel" which will be loaded later
> by using kexec. Please refer linux_src/Documentation/kdump/kdump.txt for
> more information.
> 
> I tried to load dump capture configured kernel and facing similar kind of
> problem. After successful loading, Dump capture kernel is NOT BOOTING UP
> upon kernel crash.

Do you get any message from the dump capture kernel? How do you trigger
the dump?

> I used the following command to load:
> 
> # kexec -t elf-ppc64 --append="video=ps3fb:mode:166 rhgb root=/dev/ps3da3
> single maxcpus=1 noirqdistrib" \
>  --initrd=/boot/initrd-2.6.23-kdump.img \
>  -p vmlinux.strip.kdump

	^^ Is this kernel compiled with CRASH_DUMP enabled? If yes, it
should build the kernel for 32MB.

> *
> Output:*
> *setup_memory_ranges memory_range[0] start:585001, end:8000000
> get memory ranges:1
> setup_memory_ranges memory_range[0] start:585001, end:8000000
> Modified cmdline:video=ps3fb:mode:166 rhgb root=/dev/ps3da3 single maxcpus=1
> noirqdistrib elfcorehdr=71068K savemaxmem=64M
> segment[0].mem:0x4000000 memsz:5599232

			^^ Says the vmlinux is loaded at 64MB
> segment[1].mem:0x4557000 memsz:65536
> segment[2].mem:0x4567000 memsz:4096
> segment[3].mem:0x4568000 memsz:36864
> segment[4].mem:0x4571000 memsz:3469312
> segment[5].mem:0x7fff000 memsz:4096
> *
> One more thing I confirmed was, this same dump capture kernel boots up
> properly when I load it on normal mode (kexec -l and then kexec -e). I am
> having no clue on this..

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