ADLINK cPCI-6625 - Manual (Page 65)

BIOS Setup Utility 53
cPCI-6625
7.3.5 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. Set this value
to Enable/Disable/Auto.
EHCI Hand-off
This is a workaround for OSes without EHCI hand-off support.
The EHCI ownership change should be claimed by the EHCI
driver. Options: Enable, Disable.