Xerox 4540 Service Manual - Page 119

2.21 BIOS ROM Memory In systems that have multiple PCI cards installed, and with the option ROM in all the cards enabled, the following error messages are displayed: Not enough space to copy PCI option ROM. Option ROM memory space exhausted. The BIOS Option ROM is 128 KB. Of these 128 KB, approximately 86 KB are used by the VGA controller, the Marvell controller (X4500), the LSI SAS1068E controller (X4540) and the on-board NIC. Approximately 42 KB remain for the other option ROMs. Because of the order that the devices in the system are scanned and detected during system boot, the option ROM space is exhausted before all cards can be scanned. This affects which slots can be used for bootability. Another side effect of this problem is that you cannot PXE boot using the on-board NICs. When you press F12 to PXE boot with this configuration, the following error message appears when the system tries to reach the PXE server: PXE-ECI: Base code ROM-ID structure was not found. Exiting Intel Boot Agent. 2.22 Devices and PCI Slots Currently, the devices and PCI slots are detected by the BIOS during startup in the following order: 1. On-board SATA controllers 0 through 3 2. Onboard Intel NIC 3. On-board SATA controllers 4 and 5 4. Slot 0 5. Slot 1 To work around the problem for booting devices without exhausting all the option ROM memory: ■ Do not install PCI cards in slots 0 and 1 ■ Use the BIOS PCI/PnP menu to disable OPROM scanning for PCI-X slots 0 and 1. Chapter 2 Powering On and Configuring BIOS Settings 2-85