ADLINK cPCI-6930 - Manual (Page 97)

BIOS Setup 83
cPCI-6930
8.3.6 USB Configuration
Legacy USB Support
Enables legacy USB support. Auto option disables legacy sup-
port if no USB devices are connected. Disable option will keep
USB devices available only for EFI applications. Options:
Enable/Disable/Auto
USB 3.0 Support
Enable/Disable USB3.0 (XHCI) Controller support. Options:
Enabled, Disabled.
XHCI Hand-off
This is a workaround of OSes without XHCI hand-off support.
The XHCI ownership change should be claimed by XHCI
driver. Options: Enabled, Disabled.