linux-kernel - Re: [RFC PATCH 01/10] powerpc/chrp: Remove CHRP support

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Message-ID: <20241127201015.GO29862@gate.crashing.org>
Date: Wed, 27 Nov 2024 14:10:15 -0600
From: Segher Boessenkool <segher@...nel.crashing.org>
To: Michael Ellerman <mpe@...erman.id.au>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        geert@...ux-m68k.org, arnd@...db.de
Subject: Re: [RFC PATCH 01/10] powerpc/chrp: Remove CHRP support

On Tue, Nov 26, 2024 at 02:49:49PM +1100, Michael Ellerman wrote:
> Segher Boessenkool <segher@...nel.crashing.org> writes:
> > On Fri, Nov 15, 2024 at 12:11:04AM +1100, Michael Ellerman wrote:
> >> CHRP (Common Hardware Reference Platform) was a standard developed by
> >> IBM & Apple for PowerPC-based systems.
> >> 
> >> The standard was used in the development of some machines but never
> >> gained wide spread adoption.
> >> 
> >> The Linux CHRP code only supports a handful of machines, all 32-bit, eg.
> >> IBM B50, bplan/Genesi Pegasos/Pegasos2, Total Impact briQ, and possibly
> >> some from Motorola? No Apple machines should be affected.
> >> 
> >> All of those mentioned above are over or nearing 20 years old, and seem
> >> to have no active users.
> >
> > This was used by all non-IBM 970 systems as well.  The last was SLOF on
> > JS20 and JS21, about 20 years ago yes, and I doubt anyone uses it still
> > (I don't).
> 
> By "this" you mean the CHRP standard?

I mean the "maple" stuff, and the whole "chrp" thing in PowerPC Linux.

> At least in Linux the "CHRP" platform has always been 32-bit only AFAIK.

No?  I've written stuff for it for years :-)

> My memory is that JS20/JS21 used the "maple" platform, which was a
> 64-bit only bare-metal platform, possibly it was actually == CHRP, but
> we didn't call it that in Linux.

Well, it is what it is called in the Open Firmware device trees!

It has a root "device_type" property that starts with the string "chrp".
But that really is only because Yaboot for some reason needs it to
behave reasonably, heh.  (I didn't remember the details, but I still
have the original SLOF open source release tarballs :-) )  So yeah it
wasn't anything "chrp" in Linux itself, aha.

> But maybe I'm wrong, you were more involved than me back than, and it
> was a long time ago :)

Very long ago.  Sad to see it go, but the Git tree will never forget :-)


Segher