Map 8mb of the Voodoo into the A1200-address-space and thane route all acceses to any PCI-card through these 8mb.
Still weird ;-)
Not that I'm against a Voodoo card, and it's not like PCI gfx cards are easy to get (well different models that is) but maybe they should have opted for a "put some mem on the mediator to route all acces..)
But then, I'm no hardware designer...