Kdump for ARM (vmcore generation problem)

Bernhard Walle bwalle at suse.de
Mon Aug 20 07:53:59 EDT 2007

* Indraneel <indraneel.m at samsung.com> [2007-08-20 13:51]:
> 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 
> comment").

Is the ARM kernel relocatable? If no, then you don't need this.


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