[gPXE] multiple virtio network cards, qemu and gpxe.

[Vagrant Cascadian]

greetings, greetings.

i was testing out gPXE today using qemu on a debian system (0.12.4+dfsg-2),
with gPXE roms built from 1.0.1-rc1, and i noticed an issue when using the
virtio network driver.

if there was only one virtio network card, gPXE would work fine.

if i configured qemu to use two virtio network cards, gPXE would very briefly
display the following message and reboot:

  I/O address 0x0000c020, IRQ #11
  MAC address 52:54:00:12:34:56
  WARNING: Using legacy NIC wrapper on 52:54:00:12:34:56

with two cards, it doesn't get as far as displaying:

  gPXE 1.0.1-rc1 -- Open Source Boot Firmware -- http://etherboot.org
  Features: AoE HTTP iSCSI DNS TFTP bzImage COMBOOT ELF Multiboot NBI PXE PXEXT

other network cards i tested e1000, pcnet, ne2k_pci seemed to handle multiple
network cards without problem.

live well,
  vagrant