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

Jason Baron jbaron at redhat.com
Wed Oct 10 16:26:51 CEST 2012

On Wed, Oct 10, 2012 at 08:14:46AM +0200, Gerd Hoffmann wrote:
>   Hi,
> > 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)?
> roms/Makefile builds seabios for qemu and copyes bios.bin to pc-bios/.
> Needs to be updated to also copy the acpi tables.  acpi tables must be
> committed (like pc-bios/bios.bin, this is done for non-x86 hosts which
> can't easily build x86 bios btw).  "make install" must be updated to
> also install the acpi tables.  pc_piix.c should load them from disk and
> stick into fw_cfg.
> cheers,
>   Gerd

Right, I implemented the patch below for this:

--- a/Makefile
+++ b/Makefile
@@ -275,7 +275,8 @@ bamboo.dtb petalogix-s3adsp1800.dtb petalogix-ml605.dtb \
 multiboot.bin linuxboot.bin kvmvapic.bin \
 s390-zipl.rom \
 spapr-rtas.bin slof.bin \
+palcode-clipper \
+acpi-dsdt.aml q35-acpi-dsdt.aml \
--- a/roms/Makefile
+++ b/roms/Makefile
@@ -12,6 +12,7 @@ bios: config.seabios
 	sh configure-seabios.sh $<
 	make -C seabios out/bios.bin
 	cp seabios/out/bios.bin ../pc-bios/bios.bin
+	cp seabios/out/*dsdt.aml ../pc-bios/
 seavgabios: $(patsubst %,seavgabios-%,$(vgabios_variants))

Another point of discussion is the ordering of the commits to seabios
vs. qemu. We could commit the above patch now (without the q35 aml, and
with the acpi-dsdt.aml file).

For q35, we could wait for the SeaBIOS bits to go in first, and then add
the q35-acpi-dsdt.aml to pci-bios/. In that way, no special command line
option will ever be required for q35 (except maybe -M pc_q35).

The alternative would be to commit both trees in parallel, and have
users of q35 specify -L <bios dir with q35 dsdt table>, until the
q35-acpi-dsdt.aml is added to qemu.

I could definitely see a strong case for the former option (waiting on
SeaBIOS bits), but wanted to have an agreed on plan for this.



More information about the SeaBIOS mailing list