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Date: Tue, 02 Jun 2020 17:13:25 +0200
From: "Daniel Kolesa" <daniel@octaforge.org>
To: =?UTF-8?Q?Michal_Such=C3=A1nek?= <msuchanek@suse.de>,
 "Joseph Myers" <joseph@codesourcery.com>
Subject: Re: ppc64le and 32-bit LE userland compatibility
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On Tue, Jun 2, 2020, at 16:23, Michal Such=C3=A1nek wrote:
> On Tue, Jun 02, 2020 at 01:40:23PM +0000, Joseph Myers wrote:
> > On Tue, 2 Jun 2020, Daniel Kolesa wrote:
> >=20
> > > not be limited to being just userspace under ppc64le, but should b=
e=20
> > > runnable on a native kernel as well, which should not be limited t=
o any=20
> > > particular baseline other than just PowerPC.
> >=20
> > This is a fairly unusual approach to bringing up a new ABI.  Since n=
ew=20
> > ABIs are more likely to be used on new systems rather than switching=
 ABI=20
> > on an existing installation, and since it can take quite some time f=
or all=20
> > the software support for a new ABI to become widely available in=20
> > distributions, people developing new ABIs are likely to think about =
what=20
> > new systems are going to be relevant in a few years' time when worki=
ng out=20
> > the minimum hardware requirements for the new ABI.  (The POWER8 mini=
mum=20
> > for powerpc64le fits in with that, for example.)
> That means that you cannot run ppc64le on FSL embedded CPUs (which lac=
k
> the vector instructions in LE mode). Which may be fine with you but
> other people may want to support these. Can't really say if that's goo=
d
> idea or not but I don't foresee them going away in a few years, either=
.

well, ppc64le already cannot be run on those, as far as I know (I don't =
think it's possible to build ppc64le userland without VSX in any configu=
ration)

>=20
> Thanks
>=20
> Michal
>

Daniel