Method and apparatus for configuring a bus-to-bus bridge

摘要

An information processing system includes a processor for processing information; a processor bus, a first expansion bus; a host bridge for coupling the processor bus to the first expansion bus; a second expansion bus; a first bus bridge for coupling the first expansion bus to the second expansion bus; a plurality of input/output (I/O) devices coupled to the second expansion bus; and a first storage device for storing a first set of configuration data for the plurality of I/O devices; a second storage device for storing additional configuration data. The first storage device includes a register for storing a pointer for pointing to addresses in the first storage device for forwarding addresses sent from the processor to the I/O devices.