Option ROM with support for 2 device ids

[NiKiZe]

You can build a ROM with support for multiple drivers via the -- separator via drivers (see http://ipxe.org/appnote/buildtargets)
But i think there is supposed to be some magic for roms that detects which pci device it was loaded from, and only initialize that specific device, even if there also is other devices that the iPXE instance support.

Which drivers is it that you are trying to support? and do you have it working for one device, and if so what did you use to build for that one device?