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Re: [Qemu-ppc] [PATCH] mac99: Bring memory layout closer to real hardwar

From: Mark Cave-Ayland
Subject: Re: [Qemu-ppc] [PATCH] mac99: Bring memory layout closer to real hardware
Date: Mon, 14 Apr 2014 22:29:20 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20131103 Icedove/17.0.10

On 14/04/14 08:21, Alexander Graf wrote:

I agree with adjusting the mac99 model instead of starting from
scratch not only because it's less work but also because there's not
much point in keeping a machine called mac99 that does not match any
real Mac. I'll send my current patch with minimal changes to make the
memory layout better match what's seen on PowerMac3,1.

I can't apply that without changing OpenBIOS as well. And OpenBIOS
doesn't get the memory layout from the machine, it only gets an
identifier that says "I'm machine numer X, use me".

So we would have to add a new machine type in fw_cfg for this machine,
as otherwise we would render newer OpenBIOS incompatible with older QEMU
at which point we can as well just call the whole thing a new machine.

There is actually precedent for making simultaneous OpenBIOS and QEMU changes; there have been a couple of times where the fw_cfg interface has changed in the past and Blue has done simultaneous commits in order to facilitate the update. Given that OpenBIOS doesn't really have a stable branch as such, I'd be okay with another coordinated update during a quiet OpenBIOS spell in the QEMU 2.1 development period.



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