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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