US Patent 7668999 Computer system with improved bus handling

A method for retrieving information about a device within an information handling system comprising a central processing unit and a plurality of devices coupled with the central processing system through an internal bus and a slot based bus expansion system for adding a plurality of devices, comprises the steps of:determining the location of a device within the system;if the device is coupled through the internal bus, then requesting a primary identification information from the device;otherwise requesting a secondary identification information from the device.