[PATCH 2/2] ppc64: Add a flag to tell the kernel it's booting from kexec

[Michael Ellerman]

On Mon, 2015-08-17 at 13:59 -0500, Scott Wood wrote:
> On Sat, 2015-07-18 at 14:57 -0500, Scott Wood wrote:
> > It needs to know this because the SMP release mechanism for Freescale
> > book3e is different from when booting with normal hardware.  In theory
> > we could simulate the normal spin table mechanism, but not (easily) at
> > the addresses U-Boot put in the device tree -- so there'd need to be
> > even more communication between the kernel and kexec to set that up.
> > Since there's already a similar flag being set (for kdump only), this
> > seemed like a reasonable approach.
> > 
> > Signed-off-by: Scott Wood <scottwood at freescale.com>
> > ---
> >  kexec/arch/ppc64/kexec-elf-ppc64.c | 11 ++++++++++-
> >  kexec/arch/ppc64/kexec-ppc64.h     |  2 ++
> >  purgatory/arch/ppc64/v2wrap.S      | 11 +++++++++++
> >  3 files changed, 23 insertions(+), 1 deletion(-)
> 
> Any comment on these two patches?

We should probably reserve 0x58 in the kernel's head_64.S too?

cheers