Not having the docs for the graphics chipset eliminates one possibility for changing the address, but I was referring to changing it via PCMCIA configuration. This is part of the PCMCIA standard and is well documented.
The addresses used for the various configurations can be extracted from the card's CIS. The easiest way to do this would be to use the Linux PCMCIA tools on a laptop, but if you want to do it on the Amiga, my pccard.library would be useful. You might also want to look at how Linux configures this card at the PCMCIA level if you haven't already.
