[Buildroot] [PATCH 2/4] package/arm-gnu-a-toolchain: new package

[Thomas Petazzoni]

On Thu, 13 Feb 2020 12:20:05 +0300
Sergey Matyukevich <geomatsi at gmail.com> wrote:

> > > Could you please clarify why a separate toolchain is required to build
> > > ATF for this platform ? Is there any specific requirements other than
> > > this particular build error ?  
> > 
> > Rockchip rk3399 has cortex-m0 and these changes are build during ATF.
> > and then environment should have arm32 cross toolchain to make it
> > build successfully.
> > 
> > I think, Sunil need to write something more on this requirement on
> > commit message.  
> 
> Well, I mean that other ATF firmwares can be built with standard buildroot
> toolchain. I guess this is the case for Rockchip ATF as well. You just need
> to specify available toolchain using environment variable or something.
> In the worst case, some patch modifing Makefiles in Rockchip ATF
> source tree is needed.

No, this is not correct. Depending on the platform, ATF may include
code that runs on ARM32 co-processors, and ARM32 code cannot be built
with an ARM64 toolchain.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com