TYAN TS75-B7122 Service Engineer's Manual page 181

5.3.16 USB Configuration
XHCI Hand-off
This is a workaround for OSes without XHCI hand-off support. The XHCI ownership
change should be claimed by XHCI driver.
Disabled / Enabled
USB Mass Storage Driver Support
Enable/Disable USB Mass Storage Driver Support.
Disabled / Enabled
Port 60/64 Emulation
Enables I/O Port 60h/64h emulation support. This should be enabled for the
complete USB keyboard legacy support for non-USB aware OSes.
Disabled / Enabled
USB transfer time-out
The time-out value for Control, Bulk and Interrupt transfers.
1 sec / 5 sec / 10 sec / 20 sec
Device reset time-out
USB mass storage device Start Unit command time-out.
10 sec / 20 sec / 30 sec / 40 sec
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