Supermicro X10DRS-2U - Page 84

Chapter 4: AMI BIOS
4-17
EHCI2
Select Enabled to enable EHCI (Enhanced Host Controller Interface) support on
USB 2.0 connector #2 (-at least one USB 2.0 connector should be enabled for EHCI
support.) The options are Disabled and Enabled.
XHCI Pre-Boot Drive
Select Enabled to enable XHCI (Extensible Host Controller Interface) support on a
pre-boot drive specied by the user. The options are Enabled and Disabled.