Chapter 6: UEFI BIOS
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MemBar1 size
Use this feature to set up the VMD memory BAR1 size. The default is
25
.
MemBar1 attribute
Use this feature set up the VMD configuration BAR attribute. The options are
32-bit
prefetchable
, 64-bit non-prefetchable, and 64-bit prefetchable.
MemBar2 size
Use this feature to set up the VMD memory BAR2 size. The default is
20
.
MemBar2 attribute
Use this feature set up the VMD configuration BAR attribute. The options are
64-bit
non-prefetchable
, and 64-bit prefetchable.
PCI-E Completion Timeout Disable
Use this feature to enable PCI-E Completion Timeout support for electric tuning. The
options are Yes,
No
, and Per-Port.
South Bridge Configuration
The following South Bridge information will display:
•
USB Module Version
•
USB Devices
Legacy USB Support
Select Enabled to support onboard legacy USB devices. Select Auto to disable legacy support
if there are no legacy USB devices present. Select Disable to have all USB devices available
for EFI applications only. The options are
Enabled,
Disabled, and Auto.
XHCI Hand-off
This is a workaround solution for operating systems that do not support XHCI (Extensible
Host Controller Interface) hand-off. The XHCI ownership change should be claimed by the
XHCI driver. The settings are Enabled and
Disabled
.
Port 60/64 Emulation
Select Enabled for I/O port 60h/64h emulation support, which in turn will provide complete
legacy USB keyboard support for the operating systems that do not support legacy USB
devices. The options are Disabled and
Enabled
.
