ADLINK MXE-5300 Series - Manual (Page 67)

BIOS Settings 57
MXE-5300
5.2.9 USB Configuration
Legacy USB Support
AUTO option disables legacy support if no USB devices are
connected, DISABLE option keeps USB devices available only
for EFI applications.
USB3.0 Support
Enables or disables USB3.0 (XHCI) controller support, allowing
USB 3.0 devices to be used in DOS environment.
XHCI Hand-Off
Enables BIOS support of XHCI Hand-Off feature. Default
option is Enabled.
EHCI Hand-Off
Enables BIOS support of EHCI Hand-Off feature. Default
option is Enabled.