Depends on the chipset. I've had parts that theoretically could access beyond 256k Bytes of range but had all kinds of hoops to jump through in register settings to decode beyond that. -Bari
Peter Stuge wrote:
If the part is connected via an LPC bus no more lines are needed, but then it's up to the address decoder in the southbridge. I don't know if they typically only decode limited ranges to the LPC bus.