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Initial implementation of kdump for ARM

Janboe Ye linux-arm-kernel 1 version New

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

These are some other hard code address in some boards.

For example, beagle board boot_params is 0x80000100.

I guest nokia's Nseris does not use atags for transfering params.

When I test my relocated kernel, it blocks at machinee initialization.

Maybe there is other address mapping issue. I will look it tomorrow.

Janboe

Quoted 33 lines · Mika Westerberg
Quoted 2 lines · ext Janboe Ye

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

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