(resend to kexec list)
Hi Vivek,
> I got a stupid question.
>
> - What's the advantage of building a 32bit binary for powerpc64 bit
> platforms?
So you don't need to have 64-bit libc and libz present. It's often the
case that you have an entire 32-bit userspace environment, but still
require 64-bit libraries just for the kexec program.
> IOW, why do you need to build 32bit purgatory?
We build the purgatory for the $target architecture, that's all. My
setup involves:
build: powerpc-linux-gnu
host: powerpc-linux-uclibc
target: powerpc64-linux-uclibc
So I'm aiming for a 64-bit purgatory here, we generally tend to boot
64-bit kernels on powerpc64 machines.
> Can't we launch 32bit kernel from 64bit purgatory?
I assume so, but you wouldn't be able to do this on 32-bit machines, of
course. I haven't been trying the case where the purgatory arch !=
kernel arch.
> > This allows us to kexec a powerpc64 kernel from a powerpc
> > userspace. x86{,_64} users might find this handy too, but I don't
> > have hardware to test.
>
> I think x86 it already happens. I think I can launch 64bit kernel
> from a 32bit kexec.
OK, this change should make this possible for all arches, just by
specifying --host and --target - are you able to make sure that you can
build a kexec where host=i386-linux and target=x86_64-linux ?
Cheers,
Jeremy
