NEC 1080Xd manual Default value of an Option ROM Scan of the extended PCI slot

Table 4-9. Extended PCI Slot Submenu

Menu	Option	Description
PCI Slot#1	Disabled	Specifies whether to expand Option ROM expansion of
Option ROM Scan	[Legacy Enabled]	the PCI device installed in PCI Slot#1-4 on the specified
		PCI bus.
	EFI(EBC) Enabled
PCI Slot#2		Disabled: No Option ROM expansion
	EFI(IPF) Enabled
Option ROM Scan		Legacy Enabled: Option ROM expansion exists
		(Boots IA32 Oprom.)
PCI Slot#3	For default values,
Option ROM Scan		EFI (EBC) Enabled: Option ROM expansion exists.
	refer to the
		(Boots EBC EFI driver.)
	description below.
PCI Slot#4
Option ROM Scan		EFI (IPF) Enabled: Option ROM expansion exists.
		(Boots IPF EFI driver.)

Default value of an Option ROM Scan of the extended PCI slot:

Depending on number of the Option ROM expansion installed on devices, a system startup time delay may occur due to an Option ROM Scan.

If this happens, restrict the slots with the Option ROM of the PCI card enabled as the boot device, and set the default value of the Option ROM Scan of the slot to “Legacy Enabled.” For the remaining slots, set the default value to “Disabled.”

The default values of Option ROM Scan of the extended PCI slot are shown below.

Table 4-10. Default Values of Extended PCI Slot Option ROM Scan

Target Slot	Default Value	Remarks
All slots under the GSL with the lowest number of	Legacy	PCI bus #0 and PCI bus #1 *
the master IOC (All slots under GSL#0a and	Enabled
GSL#0b)
Slots except above	Disabled	PCI bus #2 and PCI bus with
		larger number

*When a card with PCI-to-PCI Bridge is configured on GSL#0a and GSL#0b, the BIOS assigns a bus number to PCI bus under the PCI-to-PCI bridge. And this remark is not applicable.

Example:

When a PCI-to-PCI Bridge is configured on the slot under GSL#0b, PCI Bus #0 is assigned to GSL#0a. And PCI Bus #1 and PCI Bus#2 are assigned to PCI bus under GSL#0b. In this case, PCI Bus #3 and larger bus number is assigned to PCI bus under GSL with non lowest number. If a PCI-to-PCI Bridge is configured on PCI Bus #0, this example is not applicable.

BIOS Setup 4-25