Patent ID: 7100088

Claim:
A method of initializing a computer system equipped with a debugging system, wherein the computer system has a CPU, a local, peripheral and expansion bus, a first and second bridge, and a ROM coupled to the expansion bus and storing a first BIOS code, and the debugging system is coupled to the peripheral bus, the method comprising the steps of: routing data requests directed to the ROM to the local bus via the CPU; transferring the data requests from the local bus to the peripheral bus via the first bridge; switching the second bridge into a normal mode wherein the second bridge is enabled to respond to data requests on the peripheral bus with the first BIOS code in the ROM to be loaded in the CPU; and switching the second bridge into a debugging mode wherein the second bridge is disabled from responding to data requests on the peripheral bus, instead, the debugging system responds to data requests with the second BIOS code to be loaded in the CPU.