On Mon, Aug 12, 2013 at 08:37:00AM +0200, Gerd Hoffmann wrote:
> If we make it a rule that PCI is`setup before ACPI tables
> are read, then QEMU can do the patching itself when
> it detects BIOS reading the tables.
Approach makes sense to me. The ordering constrain shouldn't be a big
burden, hardware detection+bringup (including pci setup) is the first
thing done by the firmware, loading/generating acpi tables is one of the
last things. And it avoids the need to communicate the addresses (or
patch locations) between qemu+firmware.
What do you want to use this for? pmbase and xbar are simple, they are
just a single register read. pci io windows needs a root bus scan, but
should be doable too.
Right. We'll need to migrate the offsets for patching since
they are tied to specific AML and this can change.
> Gerd, Laszlo,others, does this rule work for alternative
It surely works for coreboot, and I would be very surprised if this
causes trouble for ovmf.