[SeaBIOS] [PATCH 2/2] accept MADT over fw_cfg

[David Woodhouse]

On Thu, 2013-03-21 at 15:12 +0200, Michael S. Tsirkin wrote:
> On Thu, Mar 21, 2013 at 01:04:35PM +0000, David Woodhouse wrote:
> > On Thu, 2013-03-21 at 13:56 +0100, Laszlo Ersek wrote:
> > > - for an earlier qemu, the option must be set,
> > > - for a later qemu the option must be clear &&
> > >   (no -acpitable switch must be specified on the qemu cmldine ||
> > >    one -acpitable switch must load a MADT)
> > 
> > Hm, that sounds like it won't be possible to build one version of
> > SeaBIOS that works for *both* old and new qemu. That doesn't seem like a
> > great idea. I'd prefer something like:
> > 
> > - If Qemu provides the 'core' ACPI tables (i.e. not just SSDT) then 
> >   SeaBIOS uses them.
> > - Otherwise, it makes its own.
> > 
> > 
> > -- 
> > dwmw2
> 
> It might simplify life for someone bisecting qemu
> as you don't need to rebuild seabios after each
> bisect but is this really a common workflow?

Not bisection, but perhaps switching between an old and a new version of
qemu.

> Anyway, I am not against such runtime flags.
> 
> If we add to this an option to build a minimal BIOS
> that only works with the new QEMU, do we have a deal?

Yeah, definitely. The code for SeaBIOS to build its own should certainly
be optional. It should be possible to build a minimal SeaBIOS which
*can't*.

-- 
dwmw2
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