[PATCH 00/12] Fixing TI Keystone2 kexec

[Dave Young]

Hi, Russell

On 04/28/16 at 10:26am, Russell King - ARM Linux wrote:
> These changes are required for TI Keystone2 kexec to be functional.  TI
> Keystone2 has the run-time view of physical memory above 4GiB, but with
> a boot time alias below 4GiB which can only be used during the early
> boot.
> 
> This means we need to translate run-time physical addresses (which the
> kernel uses) to boot-time physical addresses, which, having discussed
> with Eric, is what the kexec tools and kexec kernel API requires.
> 
> We publish a special set of boot time resources in /proc/iomem, which
> the (modified) kexec tools look for in preference to the normal resources.
> Hence, if these are found, the kexec tools make use of these resources,
> and thus kexec tools use the boot-time view of physical memory.

I think getting memory ranges from device tree will be better than
adding more stuff to /proc/iomem. Geoff's arm64 kexec patches is using dtb
you can refer to the patchset.

Thanks
Dave