Re: [Crash-utility] [PATCH] ARM: use generic_dump_irq() instead of a custom one
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)
{
...
/*
* We allocate ELF core header from the end of the memory area reserved
* for the crashkernel. We align the header to SECTION_SIZE (which is
* 1MB) so that available memory passed in kernel command line will be
* aligned to 1MB. This is because kernel create_mapping() wants memory
* regions to be aligned to SECTION_SIZE.
*/
elfcorehdr = add_buffer_phys_virt(info, buf, bufsz, bufsz, 1 << 20,
crash_reserved_mem.start,
crash_reserved_mem.end, -1, 0);
dbgprintf("elfcorehdr: %#lx\n", elfcorehdr);
cmdline_add_elfcorehdr(mod_cmdline, elfcorehdr);
...
Regards,
MW