On Mon, Dec 14, 2009 at 04:01:43PM +0200, Michael S. Tsirkin wrote: > On Mon, Dec 14, 2009 at 02:35:31PM +0100, Alexander Graf wrote: > > Michael S. Tsirkin wrote: > > > On Mon, Dec 14, 2009 at 12:55:28PM +0100, Alexander Graf wrote: > > > > > >> Am 14.12.2009 um 11:59 schrieb "Michael S. Tsirkin" <m...@redhat.com>: > > >> > > >> > > >>> On Mon, Dec 14, 2009 at 11:16:34AM +0100, Gerd Hoffmann wrote: > > >>> > > >>>> On 12/14/09 10:44, Michael S. Tsirkin wrote: > > >>>> > > >>>>> No, it did not even start booting the kernel. Just gave me blank > > >>>>> screen. > > >>>>> > > >>>> [ testing ] > > >>>> > > >>>> Oh. That is something completely different. A bug in the rom > > >>>> loader. > > >>>> It fails to fit both e1000 (default nic) and virtio-net boot roms > > >>>> into > > >>>> the option rom area and bails out (before loading seabios). vl.c > > >>>> doesn't check the return value and happily continues (without bios). > > >>>> Which doesn't work out very well ... > > >>>> > > >>>> With two identical nics the (single) rom fits and qemu boots. > > >>>> > > >>>> Hmm. Of course vl.c must be fixed to check the return value. > > >>>> > > >>> Yes. > > >>> > > >>> > > >>>> Not sure how to deal with the rom size issue. The gPXE roms look > > >>>> quit > > >>>> big compared to the older roms we had. > > >>>> > > >>> Hmm, it's a regression then ... > > >>> > > >> How does real hw handle this? I'm pretty sure most servers these days > > >> use more option rom space than this. They usually have some onboard raid > > >> bios, external storage, on-board nic, pci nic, ... > > >> > > > > > > Real hardware might do several things I know about > > > - option rom is typically small. > > > - option rom is not loaded always (BIOS option), or not for all cards. > > > There are might be other tricks. > > > > > > > There are probably other tricks. I was booting up a machine that had > > like 5 options roms going through their initialization that all weren't > > exactly small. > > This might boil down to better ROMs. E.g. > maybe they request memory with PMM and then give it up > after initialization? That would be my guess.
However, gpxe rom are also used in real hardware. Maybe there is some config trick we're missing?
