[PATCH 00/10] arm64 kexec kernel patches V5

[Dave Young]

On 11/03/14 at 07:46pm, Mark Rutland wrote:
> On Fri, Oct 31, 2014 at 07:52:09AM +0000, Dave Young wrote:
> > Hi Geoff
> > 
> > I tested your patches. The macihne is using spin-table cpu enable method
> > so I tried maxcpus=1 as you suggested.
> > 
> > There's below issues for me, thoughts?
> > 
> > 1. For acpi booting there's no /proc/device-tree so kexec can not find dtb
> > to use.
> 
> Are you absolutely certain of this?
> 
> To use ACPI, you must have booted via EFI, as the only mechanism for
> finding the ACPI tables is via EFI. If booted via EFI, the stub will
> have created a stub DTB if there is no provided DTB, to pass the command
> line and pointers to EFI data structures. This stub DTB should be
> present in the usual place.

Mark, I used kexec-tools from Geoff's git tree, it will create dtb from procfs
maybe I can pass external dtb to kexec-tools. What you mentioned should be true
though but I have not get idea how to get the dtb which kernel is using for boot
since it is not unflattened.

Thanks
Dave