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Cards that may be required during Open Firmware startup include display, keyboard, and mouse devices, mass storage devices such as SCSI, IDE, floppy disk, and magneto-optical drives, and network interfaces. If Open Firmware FCode is not included in such a card's expansion ROM, the card will not be usable until the operating system loads its supporting software from a mass storage device after startup.
This section describes the possible ways that a device with a valid PCI expansion ROM can be configured. They range from full Open Firmware support, in which the card is usable during startup, to no support.