[Buildroot] powerpc64 support

[Gustavo Zacarias <gustavo@zacarias.com.ar>]

On 01/30/2014 03:11 PM, Danny Gale wrote:

> Hi all,
> 
> We have used buildroot in the past to build filesystems for 32-bit
> powerpc's with great success. Our newest boards are using 64-bit
> powerpc's, however. Using menuconfig with buildroot 2013-11, I don't see
> a target architecture for powerpc64. Is there support for 64-bit powerpc's?
> 
> We're using an externally-generated toolchain, which is compiled for
> 64-bit powerpc's, specifically the e6500 core
> (powerpc64-e6500-linux-gnu-). Will selecting powerpc but using this
> 64-bit toolchain generate 64-bit filesystems? I don't see the e6500
> listed as a supported Target Architecture Variant either, but I believe
> it can run 32-bit code generated for the e500 cores.

Hi Danny.
That's because nobody did the necessary modifications yet.
You'd need to add 64 bit cores/defines into arch/Config.in.ppc and
arch/Config.in, and adjust all the available toolchain options for them.
IIRC the e6500 can execute e500mc code, but not e500v* since the later
use SPE instead of a normal FPU (which i think the e6500 doesn't carry
over, using the classic & altivec IIRC).
It may be possible to build internal toolchains too given the appropiate
component (binutils/gcc) versions.
uClibc definitely doesn't handle ppc64, so that would just leave
glibc/eglibc in the libc department.
Regards.