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PCI PPB option ROM

>>Can anyone tell me the purpose of a possible option ROM for a PCI-to-PCI
>>bridge? The expansion ROM BAR is defined in the PCI Type 1 header for PPB. If
>>this is implemented, it means there is an option ROM for the PPB. What is the
>>purpose of the ROM? Does the ROM have to be executed to initialize the bridge
>>so as to open up the access to the lower busses?
>>Is there any option ROM on the PPBs currently available on the market?
>>D. Wei