Linux kernel crash dumps for ARM
Eric W. Biederman
ebiederm at xmission.com
Tue Jan 5 00:20:23 EST 2010
Venkappa Mala <Venkappa.Mala at lntinfotech.com> writes:
I have added the kexec list and corrected the lkml addresses.
In principle it should not be too hard to use kexec on panic
support on arm.
I don't do any arm development so I don't have a clue what the status
of the support is on arm.
> 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,
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