[PATCH 0/8] Initial implementation of kdump for ARM

[Mika Westerberg]

On Fri, Apr 23, 2010 at 05:05:56AM +0200, ext Janboe Ye wrote:
> I am trying this. But it seems need to do a lot work to make kdump
> to work on other omap3 board.

You need to have userspace tools (in this case kexec-tools) which load the
crashkernel into the running kernel. I'm planning to send my kexec-tools
patches to upstream after the kernel part is accepted (so that they can be
in sync) but I can provide you the patches if needed.

For kernel part, I believe only thing that needs to be done is to make sure
that PHYS_OFFSET of the crashkernel is configured correctly.

For example in my platform (and I guess all OMAP3s) physical memory starts
at 0x80000000 and this is the PHYS_OFFSET used by the primary kernel. I decided
to load crashkernel at physical address 0x84000000.

So I boot the primary kernel with 'crashkernel=32M at 0x84000000'. Now memory for
crashkernel is reserved.

Only thing left is to load the craskernel itself which is done like (with patched
kexec-tools):

	# kexec -p /boot/zImage.crash --command-line="..."

What kind of problems you are having?

Thanks,
MW