[SeaBIOS] [PATCH v2 9/9] seabios: Build the dsdt separately

Jason Baron jbaron at redhat.com
Tue Oct 9 17:02:52 CEST 2012

On Tue, Oct 09, 2012 at 09:13:59AM +0200, Gerd Hoffmann wrote:
> On 10/09/12 05:35, Jason Baron wrote:
> > From: Jason Baron <jbaron at redhat.com>
> > 
> > This builds seabios such that the dsdt tables are no longer built into the
> > seabios binary. They must be passed to the seabios via fw_cfg. This saves
> > space in the seabios binary for unnecessary dsdt tables.
> > 
> > I suspect that this will make other users of Seabios, besides qemu unhappy,
> > but I'm not sure.
> I think this should best be submitted / discussed separately from the
> q35 patch series.  And dropping the dsdt from seabios will should
> actually be the last step.  Loading via fw_cfg works even when seabios
> has a builtin dsdt.  So we can start loading the dsdt via fwcfg
> unconditionally in qemu without touching seabios.  Once everything is in
> place in qemu we can finally zap the builtin dsdt in seabios (or make it
> a config option so latest seabios continues to work with older qemu
> versions).

Ok, I like this idea. My only hesitation would be that the dsdt table
might in the future include a dependency on being built with seabios, such as
the 'ACPI_EXTRACT_*' stuff. At the moment it can be cleanly separated
out. And this patch enforces that.

If we don't touch seabios here as you've suggested. What steps are
required on the qemu side? To copy the 2 .aml files to its bios dir (Not
too familiar with these details)?



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