Avalue Technology EBM-APL User Manual page 62

EBM-APL User's Manual
3.6.3.4.4 USB Configuration
Item
XHCI Pre-Boot Driver
xHCI Mode
62 EBM-APL User's Manual
Option
Enable
Disable[Default]
Enable[Default]
Disable
Description
Enable/Disable XHCI Pre-Boot Driver
support.
Once disabled, XHCI controller would be
function disabled, none of the USB devices
are detectable and usable during boot and in
OS. Do not disable it unless for debug
purpose.