ADLINK MXE-200i - Manual (Page 63)

BIOS Setup 49
MXE-200
SATA Port0 HotPlug
Enables/Disables Port O HotPlug capability
B.2.3 USB Configuration
Legacy USB Support
Selecting AUTO disables legacy support if no USB devices are
connected, and DISABLE keeps USB devices available for only
EFI applications.
XHCI Hand-Off
A workaround for OSs without XHCI handoff support. XHCI owner-
ship change should be claimed by XHCI driver.