Chapter 4: BIOS
67
USB Configuration
The following USB information will display:
•
USB Module Version
•
USB Controllers
•
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 settings 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 support legacy USB
devices. The options are Disabled and
Enabled
.
USB hardware delays and time-outs:
USB transfer time-out
Use this feature to set the timeout vlaue for control, bulk, and interrupt transfers. The options
are 1 sec, 5 sec, 10 sec, and
20 sec
.
Device reset time-out
Use this feature to set the timeout value for the USB mass storage device start unit command.
The options are 1 sec, 5 sec, 10 sec, and
20 sec
.
Device power-up delay
Use this feature set the time for a device to reports itself to the host controller. Select
Auto
for the default value and select Manual to enter a value.
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