[Buildroot] [PATCH 1/1] arch/arm: Add Cortex-a53 CPU

[Khem Raj <raj.khem@gmail.com>]

> On Aug 19, 2016, at 10:49 AM, Thomas Petazzoni <thomas.petazzoni@free-electrons.com> wrote:
> 
> Hello,
> 
> On Fri, 19 Aug 2016 10:47:05 -0700, Khem Raj wrote:
> 
>>> On Fri, 19 Aug 2016 10:07:04 +1000, Matt Flax wrote:
>>>> Adds the Cortex-a53 CPU to the target architecture variant choice. This sets
>>>> the toolchain to use cortex-a53 as the target. The effect is that various
>>>> cortex-a53 tunings are enabled for the compilation of packages.
>>>> 
>>>> Signed-off-by: Matt Flax <flatmax@flatmax.org>
>>> 
>>> The A53 is an ARM64 CPU, so it should rather be added to
>>> Config.in.aarch64 (in which we don't yet have a CPU selection, but that
>>> can be added).
>>> 
>>> Or are you building a 32 bits ARM system for a Cortex-A53 ? In that
>>> case, adding it to Config.in.arm would be OK, but it's a bit annoying
>>> that we would have to duplicate many ARM CPUs between Config.in.arm and
>>> Config.in.aarch64.
>> 
>> 64bit kernel with 32bit userspace is most common usecase as of now for
>> a53 that I see. so you need some sort of multilib.
> 
> I think on RPi3 they use a 32 bit kernel and 32 bit userspace, which
> probably is what Matt was targeting. But I'd like to hear from Matt's
> use case first.

rpi3 is 32bit all the way, so this patch is fine for that case.
> 
> Thomas
> --
> Thomas Petazzoni, CTO, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com

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