I see...
Thanks,
Lei
On Mon, Dec 20, 2010 at 10:13 PM, Mika Westerberg
<mika.westerberg@xxxxxx> wrote:
> On Mon, Dec 20, 2010 at 09:37:51PM +0900, Lei Wen wrote:
>>
>> I am trying kdump on ARM. But there is one things that very confuse me...
>>
>> The parameter "elfcorehdr" should pass to the second kernel by the first one,
>> but I cannot find anywhere that I could figure out what this offset
>> value I should give
>> to elfcorehdr...
>
> It is set automatically by kexec-tools (once you load the crashkernel
> via '-p' command line option).
>
> See code in kexec/arch/arm/crashdump-arm.c:
>
> int load_crashdump_segments(struct kexec_info *info, char *mod_cmdline)
> {
> Â Â Â Â...
> Â Â Â Â/*
> Â Â Â Â * We allocate ELF core header from the end of the memory area reserved
> Â Â Â Â * for the crashkernel. We align the header to SECTION_SIZE (which is
> Â Â Â Â * 1MB) so that available memory passed in kernel command line will be
> Â Â Â Â * aligned to 1MB. This is because kernel create_mapping() wants memory
> Â Â Â Â * regions to be aligned to SECTION_SIZE.
> Â Â Â Â */
> Â Â Â Âelfcorehdr = add_buffer_phys_virt(info, buf, bufsz, bufsz, 1 << 20,
> Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Âcrash_reserved_mem.start,
> Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Âcrash_reserved_mem.end, -1, 0);
>
> Â Â Â Âdbgprintf("elfcorehdr: %#lx\n", elfcorehdr);
> Â Â Â Âcmdline_add_elfcorehdr(mod_cmdline, elfcorehdr);
> Â Â Â Â...
>
> Regards,
> MW
>
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