ADLINK EOS-4000 - Manual (Page 65)

BIOS Setup 53
EOS-4000
A.2.8 USB Configuration
Legacy USB Support
Enables Legacy USB Support. AUTO option disables legacy
support if no USB devices are connected. DISABLE option will
keep 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 for XHCI Hands-Off feature. The default
option is Enabled.