linux-kernel - Linux kernel crash dumps for ARM

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Message-ID: <EB1A7C66AD0C92419BFFC785A947865A09EA8C912A@BLRINMSMBX01.bglrodc.lntinfotech.com>
Date:	Tue, 5 Jan 2010 10:21:11 +0530
From:	Venkappa Mala <Venkappa.Mala@...infotech.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Linux kernel crash dumps for ARM

Hi,

With respect to "Linux kernel crash dumps for ARM", i have some doubts which are described as below.

If the machine has crashed so badly that you cannot enter commands or
the disk is not available then you have three options :-

(1) Hand copy the text from the screen

(2) capture crash logs using Minicom.

(3) save the crash data to a floppy disk or video rom or a swap partition or reserved memory.

In the above three options, 1 & 2 are known and works as well.

Regarding 3 option,
----------------------------
i would like to support for ARM11.

As far as i know, the supported linux kernel crash dumps are
"lkcd, netdump,diskdump, mini kernel dump and kdump/kexec".
These are supported for x86 and PowerPC architectures with some constrains.

i have some queries with respect to ARM supports, these are

1.) kexec is supported in latest kernels
        example: 2.6.29 kernel
        File: arch/arm/kernel/machine_kexec.c

    - is this working well or is there any constraints?

2) As per kexec supports, kexec-tool is required and this allows you to load directly
   to a new kernel from the currently running one

    As from my side, i am not able to find arm implementation support in kexec-tools/crash sources.

   - is kexce-tool supported for ARM or not?

3) In lkcd, netdump,diskdump, mini kernel dump and kdump/kexec tools,

   - which is the best choice for ARM or are there any best crash dump tool for ARM?

Please clarify my queries.

Best Regards,
Venkappa

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