[SeaBIOS] [PATCH 0/9] q35 seabios support take #1

Paolo Bonzini pbonzini at redhat.com
Fri Sep 14 09:23:46 CEST 2012

Il 13/09/2012 22:12, Jason Baron ha scritto:
> Subject: [PATCH 0/9] q35 seabios support take #1
> Hi,
> Seabios bits for q35 support, I'm posting the qemu changes separately. The
> patches require '-M pc_q35' and -L 'seabios dir with q35 changes' on the
> qemu command line. Hopefully, we can make it the default for x86 at some future
> point when we feel comfortable with it.

The main question, IMHO, is how to proceed for supporting both PIIX4 and
q35.  The two extreme possibilities are:

- use a single binary for everything

- use two binaries for everything

Right now, you do a mix of the two, where you have two DSDTs and one
binary.  Furthermore, PIIX4 is still a "preferred" chipset in that its
DSDT is embedded in SeaBIOS and q35's isn't.

With more than one chipset being supported, and with the desire to
support OVMF/UEFI as an alternative firmware, I think it makes sense to
move QEMU towards a model more similar to CoreBoot's, where QEMU itself
makes the default ACPI tables and passes them to SeaBIOS or OVMF via fw_cfg.

So my favorite choice is to move the DSDT to fw_cfg, and keep a single
binary for everything else.  I don't really care whether the DSDT
sources live in the SeaBIOS or QEMU repository, though the former makes
more sense until all things ACPI are done in QEMU.


More information about the SeaBIOS mailing list