Gigabyte GA-870A-USB3L User Manual page 46

USB Controllers
Enables or disables the integrated USB controllers. (Default: Enabled)
Disabled will turn off all of the USB functionalities below.
USB Legacy Function
Allows USB keyboard to be used in MS-DOS. (Default: Enabled)
USB Storage Function
Determines whether to detect USB storage devices, including USB flash drives and USB hard drives
during the POST. (Default: Enabled)
Onboard Serial Port 1
Enables or disables the first serial port and specifies its base I/O address and corresponding interrupt.
Options are: Auto, 2F8/IRQ3, 3F8/IRQ4(default), 3E8/IRQ4, 2E8/IRQ3, Disabled.
BIOS Setup - 46 -