Chapter 6: BIOS
85
South Bridge
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 work-around 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 options 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
.
Port 61h Bit-4 Emulation
Select Enabled to enable the emulation of Port 61h but-4 toggling in SMM (System
Management Mode). The options are Disabled and
Enabled
.
Install Windows 7 USB support
EHCI needs to be supported in order for USB 2.0 to work properly during the installation of
Windows 7; however, EHCI support was removed from X11 DP Motherboard platforms. When
this item is enabled, this feature will allow USB keyboard and mouse to work properly during
installation of Windows 7. After installation of Windows 7 and all the drivers, please disable
this feature. The options are
Disabled
and Enabled.