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The minimum recommended option is for the PCI card to include an expansion ROM that provides minimal Open Firmware support, including the Open Firmware properties name, reg, and device type. This option provides enough information to allow Open Firmware to build a name property for the device that is guaranteed to be unique, so the Mac OS can match it unambiguously to a run-time driver that it loads from the Extensions folder. This option does not include a FCode driver to allow your device to provide any services at boot time before the operating system is running.