Chapter 4: AMI BIOS
4-15
•Intel PCH Rev ID
•USB Conguration
•USB Devices
EHCI1
Select Enabled to enable EHCI (Enhanced Host Controller Interface) Controller 1
for USB 2.0 support. One EHCI controller must always be enabled. The settings
are Enabled and Disabled.
EHCI2
Select Enabled to enable EHCI (Enhanced Host Controller Interface) Controller 2
for USB 2.0 support. One EHCI controller must always be enabled. The settings
are Enabled and Disabled.
Legacy USB Support
Select Enabled to support legacy USB devices. Select Auto to disable legacy
support when legacy USB devices are not present. If Disable is selected, legacy
USB devices will not be supported. The options are Enabled, Disabled and Auto.
Port 60/64 Emulation
This feature enables or disables I/O port 60h/64h emulation support. This should
be enabled for complete USB keyboard legacy support for non-USB-aware op-
erating systems. The options are Disabled and Enabled.
XHCI Hand-Off
This item 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 settings are Enabled and
Disabled.
EHCI Hand-Off
This item is for Operating Systems that do not support Enhanced Host Controller
Interface (EHCI) hand-off. When this item is enabled, EHCI ownership change
will be claimed by the EHCI driver. The settings are Enabled and Disabled.
XHCI Mode
This feature handles the operation mode for the XHCI (Extensible Host Control-
ler Interface) controller. The settings are Smart Auto, Auto, Enabled, Disabled
and Manual.
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