Kdump for ARM (vmcore generation problem)

Indraneel indraneel.m at samsung.com
Mon Aug 20 07:51:05 EDT 2007

Hi Vivek/Bernhard,

Vivek Goyal wrote:
> On Tue, Aug 14, 2007 at 06:41:54PM +0530, Indraneel wrote:
>> Hi,
>> I'm trying to make Kdump work for ARM. Till now i've managed to get the 
>> /dev/oldmem interface working for taking dumps. Now i want to get the 
>> /proc/vmcore interface working.
>> I'm unclear how to generate the elfcore headers required by routines in 
>> vmcore.c.
> Hi Indraneel,
> kexec-tools in user space generates those headers. Have a loot at
> kexec-tools code.

Thanks for the lead. I'm looking into kexec-tools and trying to do 
changes for ARM. I'm unable to interpret one of the comments in 
kexec/crashdump-elf.c which says,
" The separate PT_LOAD program header is required either because the
   kernel is mapped at a different location than the rest of the
   physical memory or because we need to support relocatable kernels.
   Or both as on x86_64. "

Can you please provide some more clarification for this so that i can 
figure out whether a separate PT_LOAD header is required for ARM 
architecture as well (esp. the "kernel mapped to diff. loc. part of the 


> Thanks
> Vivek

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