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Chapter 4: AMI BIOS
XHCI Hand-Off
This is a work-around solution for operating systems that do not support XHCI (Ex-
tensible 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.
USB Mass Storage Driver Support
Select Enabled for USB mass storage device support. The options are Disabled
and Enabled.
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 sup-
port legacy USB devices. The options are Disabled and Enabled.
USB 3.0 Support
Select Enabled for USB 3.0 support. The options are Smart Auto, Auto, Enabled,
Disabled and Manual.
EHCI1
Select Enabled to enable EHCI (Enhanced Host Controller Interface) support on
USB 2.0 connector #1 (-at least one USB 2.0 connector should be enabled for EHCI
support.) The options are Disabled and Enabled.
EHCI2
Select Enabled to enable EHCI (Enhanced Host Controller Interface) support on
USB 2.0 connector #2 (-at least one USB 2.0 connector should be enabled for EHCI
support.) The options are Disabled and Enabled.
XHCI Pre-Boot Drive
Select Enabled to enable XHCI (Extensible Host Controller Interface) support on a
pre-boot drive specified by the user. The options are Enabled and Disabled.
XHCI Idle L1
Select Enabled for XHCI (Extensible Host Controller Interface) Idle Level 1 sup-
port on a USB 3.0 connector specified by the user. The options are Enabled and
Disabled.
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