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Shared PCI Host Bridge Access in a Clustered System Disclosure Number: IPCOM000020002D
Original Publication Date: 2003-Oct-16
Included in the Prior Art Database: 2003-Oct-16

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Two central electronic complexes (CECs) share a PCI Host bridge attached to the two CECs through a common interconnect structure, such as a switch or IBM pSeries* High Speed Link (HSL) loop. Operating systems in each CEC share PCI adapters connected to the common PCI Host Bridge (PHB) using memory mapped IO. A memory mapped PHB doorbell register and message buffer facilitates both operating systems sharing the PHB configuration address and data register.