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Re: [Qemu-ppc] [PATCH v3 2/2] ppc: Add aCube Sam460ex board


From: Alexander Graf
Subject: Re: [Qemu-ppc] [PATCH v3 2/2] ppc: Add aCube Sam460ex board
Date: Tue, 20 Feb 2018 13:07:43 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.6.0

On 02/20/2018 12:31 PM, Thomas Huth wrote:
On 20.02.2018 12:16, BALATON Zoltan wrote:
On Tue, 20 Feb 2018, Alexander Graf wrote:
On 02/20/2018 11:09 AM, BALATON Zoltan wrote:
On Tue, 20 Feb 2018, David Gibson wrote:
On Mon, Feb 19, 2018 at 11:34:25AM +0100, BALATON Zoltan wrote:
1;5002;0c> Add emulation of aCube Sam460ex board based on AMCC 460EX
embedded SoC.
This is not a complete implementation yet with a lot of components
still missing but enough for the U-Boot firmware to start and to boot
a Linux kernel or AROS.

Signed-off-by: Fran├žois Revol <address@hidden>
Signed-off-by: BALATON Zoltan <address@hidden>
I'm not thrilled with having a machine type that can't be used without
extracting a bootloader image from somewhere, but from the other
thread that's not easy to fix.
This is not meant to be like that and I'd like to also submit the
u-boot image once we figure out how to do it. Especially because the
boot loader one can extract from the updater is buggy but here's a
fixed binary that works here: http://zero.eik.bme.hu/~balaton/qemu/

U-Boot is GPL so we would need to include the source as well (the
README in the link above contain the source URL and the patches
needed are there as well). If there's no easy way to host it in the
QEMU repo I could put it in my own git repo and submit a patch to use
that as a submodule if that's acceptable. It seems there are some
firmware images that reference external git repos already but not
sure what's the preferred way.
IMHO the preferred way would be to integrate sam460ex support in
upstream U-Boot and just build it from there. We already mirror U-Boot
on git.qemu.org and package up that tree, so packaging up one more
target from there would be trivial.
As discussed in other thread that's not really feasible. Upstream U-Boot
has removed support for this CPU and the board code was never upstreamed
by the hardware vendor. I'm not willing to take the task of porting this
to latest U-Boot, re-adding all necessary CPU support to latest U-Boot
and then take on supporting all this in future versions. So it has to be
a separate source or you'd have to downgrade U-Boot on git.qemu.org to
the older version where the patch applies (but that's not desired as
this old version has some bugs which are fixed in later U-Boot
versions). We also cannot omit the vendor patches to U-Boot and use
latest upstream U-Boot for this board because guests rely on these
firmware modifications to boot. So I see no way to have one U-Boot
version to be used by both e500 and sam460ex even if it means adding
another U-Boot source (but this source is fairly static, I don't expect
many changes to it so it won't diverge more than it is now and we mainly
need to add it to satisfy GPL so we can bundle the binary).
Not sure, but would it maybe be possible to simply include a diff patch
file between the version of u-boot that we ship in QEMU and the version
that is required for the sam460ex in the roms/ directory?

That diff would change constantly, so that's not a great option IMHO.

I guess we could just clone yet another U-Boot git tree from a random github page, as long as people are aware this is only for sam460ex.


Alex




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