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SubjectRe: Removing architectures without upstream gcc support
On Thu, Feb 22, 2018 at 11:43:10PM +0100, Arnd Bergmann wrote:
> On Thu, Feb 22, 2018 at 8:17 PM, Richard Kuo <> wrote:
> > On Thu, Feb 22, 2018 at 04:45:06PM +0100, Arnd Bergmann wrote:
> >> * Hexagon is Qualcomm's DSP architecture. It is being actively used
> >> in all Snapdragon ARM SoCs, but the kernel code appears to be
> >> the result of a failed research project to make a standalone Hexagon
> >> SoC without an ARM core. There is some information about the
> >> project at and
> >>
> >> There is a port to gcc-4.5 on the project page, which is evidently
> >> abandoned, but there is an active upstream LLVM port that is
> >> apparently used to build non-Linux programs.
> >> I would consider this one a candidate for removal as well, given that
> >> there were never any machines outside of Qualcomm that used this,
> >> and they are no longer interested themselves.
> >
> > It's difficult for me to speak to the decisions as I can understand
> > your point of view, but maybe I can speak to some of the status.
> >
> > We still use the port internally for kicking the tools around and other
> > research projects. As you noticed we're not doing gcc anymore; we're
> > using LLVM for both kernel and userspace. Yes there have been some
> > caveats but it does work within confines.
> >
> > Time is unfortunately just limited for me to upstream some of my kernel
> > fixes and cleanups, and there are some things that just haven't shown
> > up externally yet.
> >
> > However, as James Hogan mentioned, having it in the tree really has been
> > useful because it gets included in the various upstream changes and
> > fixes, which we appreciate.
> >
> > So hopefully this will help inform the decision a little better.
> >
> > If you have any other questions please let me know.
> Thanks for the clarification! Since you are the maintainer and you
> still consider the port useful, I don't see how anyone else would be
> in a position to demand it to be removed, so we should keep it
> around until you want it gone.
> I still have a few questions:
> - Any idea how we would find out of the status ever changes? E.g. if
> you decide at some point that you don't find the latest Linux useful
> any more for your internal work, would you send a patch for removal?

Yes, we can definitely notify everyone if this happens.

> - How do I build an llvm based toolchain for Hexagon? Do I need patches
> on top of the llvm-6 release branch? Where can I find the corresponding
> binutils-2.30 sources?

The Hexagon LLVM tools available from Qualcomm should have an ABI switch
that's supposed to work for this:

-target hexagon-unknown-linux

Admittedly I haven't tried that one. I'm unsure about the full upstream
status; I'll check on that, but I think the sketchiest component out of
that bunch is currently going to be the linker.

Let me do some checking on all this the next couple of days and get
a better answer.

Richard Kuo

Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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