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

[Michael S. Tsirkin]

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?

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?

Then the plan is to make progress and apply patches step by step without
deciding on the detection interface first.
Before QEMU is switched to the new configuration,
we'll add the runtime thing for the benefit of developers
that bisect.

Makes sense?

-- 
MST