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Re: Deprecate the ppc405 boards in QEMU? (was: [PATCH v3 4/7] MAINTAINER


From: BALATON Zoltan
Subject: Re: Deprecate the ppc405 boards in QEMU? (was: [PATCH v3 4/7] MAINTAINERS: Orphan obscure ppc platforms)
Date: Tue, 5 Oct 2021 14:20:52 +0200 (CEST)

On Tue, 5 Oct 2021, Cédric Le Goater wrote:
On 10/5/21 08:18, Alexey Kardashevskiy wrote:
On 05/10/2021 15:44, Christophe Leroy wrote:
Le 05/10/2021 à 02:48, David Gibson a écrit :
On Fri, Oct 01, 2021 at 04:18:49PM +0200, Thomas Huth wrote:
On 01/10/2021 15.04, Christophe Leroy wrote:
Le 01/10/2021 à 14:04, Thomas Huth a écrit :
On 01/10/2021 13.12, Peter Maydell wrote:
On Fri, 1 Oct 2021 at 10:43, Thomas Huth <thuth@redhat.com> wrote:
Nevertheless, as long as nobody has a hint where to find that
ppc405_rom.bin, I think both boards are pretty useless in QEMU (as far as I
can see, they do not work without the bios at all, so it's
also not possible
to use a Linux image with the "-kernel" CLI option directly).

It is at least in theory possible to run bare-metal code on
either board, by passing either a pflash or a bios argument.

True. I did some more research, and seems like there was once
support for those boards in u-boot, but it got removed there a
couple of years ago already:

https://gitlab.com/qemu-project/u-boot/-/commit/98f705c9cefdf

https://gitlab.com/qemu-project/u-boot/-/commit/b147ff2f37d5b

https://gitlab.com/qemu-project/u-boot/-/commit/7514037bcdc37

But I agree that there seem to be no signs of anybody actually
successfully using these boards for anything, so we should
deprecate-and-delete them.

Yes, let's mark them as deprecated now ... if someone still uses
them and speaks up, we can still revert the deprecation again.

I really would like to be able to use them to validate Linux Kernel
changes, hence looking for that missing BIOS.

If we remove ppc405 from QEMU, we won't be able to do any regression
tests of Linux Kernel on those processors.

If you/someone managed to compile an old version of u-boot for one of these two boards, so that we would finally have something for regression testing,
we can of course also keep the boards in QEMU...

I can see that it would be usefor for some cases, but unless someone
volunteers to track down the necessary firmware and look after it, I
think we do need to deprecate it - I certainly don't have the capacity
to look into this.


I will look at it, please allow me a few weeks though.

Well, building it was not hard but now I'd like to know what board QEMU actually emulates, there are way too many codenames and PVRs.

yes. We should try to reduce the list below. Deprecating embedded machines
is one way.

Why should we reduce that list? It's good to have different cpu options when one wants to test code for different PPC versions (maybe also in user mode) or just to have a quick list of these at one place.

Regards,
BALATON Zoltan

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