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PCCard is used by PowerBook G3 Wallstreet in Open Firmware 2.0.1. CardBus is probed in New World Macs starting from at least Open Firmware 4.1.9f1 sometime after Open Firmware 3.1.1. - Create PCIBase from common stuff in PCIDevice. - Add PCIBridgeBase. These have a primary bus number, secondary bus number, and subordinate bus number which are used to determine if PCI type 1 config cycle should be passed. - Change PCIBridge to use PCIBridgeBase instead of PCIDevice. - Add PCICardBusBridge which uses PCIBridgeBase.