Xhci Hand-Off; Pcie/Pci/Pnp Configuration - Supermicro C7Z170-SQ User Manual

XHCI Hand-Off

This item is a work-around solution for operating systems that do not
support XHCI (Extensible Host Controller Interface) hand-off. The XHCI
ownership change should be claimed by the XHCI driver. The options
are Enabled and Disabled.
USB Mass Storage Driver Support
Set Enabled to enable USB mass storage driver support. The options
are Disabled and Enabled.
Install Windows 7 USB Support
Enable this feature to use the USB keyboard and mouse during
the Windows 7 installation, since the native XHCI driver support is
unavailable. Use a SATA optical drive as a USB drive, and USB CD/
DVD drives are not supported. Disable this feature after the XHCI
driver has been installed in Windows. The options are Disabled and
Enabled.

PCIe/PCI/PnP Configuration

Option ROM execution
Video
This feature controls which option ROM to execute for the Video device.
The options are Do not Launch, UEFI, and Legacy.
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Chapter 4: AMI BIOS