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

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

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.

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com