User Manual
Page 69
... Enable or disable Legacy OS Support for OSes without XHCI hand-off This is recommended to support USB devices under the UEFI setup and Windows/Linux operating systems only. PS/2 Simulator Enable the support of I/O port 60h/64h emulation. Select UEFI Setup Only to disable legacy USB support. The XHCI ownership...
... Enable or disable Legacy OS Support for OSes without XHCI hand-off This is recommended to support USB devices under the UEFI setup and Windows/Linux operating systems only. PS/2 Simulator Enable the support of I/O port 60h/64h emulation. Select UEFI Setup Only to disable legacy USB support. The XHCI ownership...