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Re: [Qemu-ppc] [PATCH] mac99: Bring memory layout closer to real hardwar
Re: [Qemu-ppc] [PATCH] mac99: Bring memory layout closer to real hardware
Mon, 14 Apr 2014 22:29:20 +0100
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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.