Chapter 3 – AMI BIOS Setup42Fanless Embedded Box PC BOXER-6951-A01-1010 / 32.1840.921-003.4.7 Advanced: USB ConfigurationOptions summary:Legacy USB SupportEnable Optimal Default, Failsafe DefaultDisableAutoEnables Legacy USB support. AUTO option disables legacy support if no USB devicesare connected. DISABLE option will keep USB devices available only for EFI applications.xHCI ModeAuto Optimal Default, Failsafe DefaultEnabledDisableMode of operation of xHCI controller.