On Tue, 2011-05-03 at 19:58 -0400, Kevin O'Connor wrote: > On Tue, May 03, 2011 at 01:49:57PM -0300, Glauber Costa wrote: > > It is theorectically possible for a system to have more than > > one pci vga card. In particular, I am interested in the use of SGAbios > > as a pci device, alongside of a normal vga bios in QEMU. > > > > This patch makes seabios continue searching the pci range looking for > > vga cards, even if it finds one. The first card to be found is assigned > > to VGAbdf, being the main one. The others, just have their initializatiom > > roms called and are listed in the pci bus. > > My understanding is that in a machine with multiple VGA devices only > one vga device is setup to forward the legacy VGA IO ranges over PCI, > and only that device should have its option ROM executed. > > My understanding is that running the vga option roms for all vga > devices would be incorrect and could cause a real machine to not boot > properly.
how's that different in pci vs vgaroms/ ? "Could cause a real machine to not boot" is true regardless. > The pci_find_vga() function attempts to find the VGA device with the > legacy VGA ranges setup in PCI. It should only return one device > regardless of the number of times it is called. > > If you're looking to run an option ROM, the easiest way is to pass it > through fw_cfg with a name prefix of "vgaroms/". SeaBIOS will then > execute the ROM in addition to any found vga roms. One can put any > number of roms in the "vgaroms/" directory. I know all that, and I agree about easiest. It took me a couple of minutes to have it integrated into qemu that way. We, however, decided that it made more sense to us to have it exposed as a pci device. So easiness is not at stake here. _______________________________________________ SeaBIOS mailing list [email protected] http://www.seabios.org/mailman/listinfo/seabios
