User`s manual

52 BIOS Settings and Driver Installation
Matrix MXC-2000 Series
User’s Manual
4.1.2.7 USB Configuration
Legacy USB Support
Legacy USB Support also refers to USB mouse and keyboard
support. Normally if this option is not enabled, attached USB
mouse or keyboard will not be available until a USB compatible
operating system fully boots up with USB drivers loaded. With
this option enabled, attached USB mouse or keyboard is
usable even when no USB drivers loaded.
USB 2.0 Controller Mode
The USB 2.0 Controller Mode configures the data rate of the
USB port. Available options are FullSpeed (12 Mbps) and HiS-
peed (480 Mbps).
BIOS EHCI hand-off
This option provides a workaround for OSes without ECHI
hand-off support. The change of EHCI ownership should be
claimed by the EHCI driver.
Option Description
Disabled
Set this value to prevent the use of any USB device
during system boot or in DOS environment.
Enabled
Set this value to allow the use of USB devices dur-
ing system boot or in DOS environment.
Auto
This option automatically detects USB keyboard or
mouse and if found, allows the usage during system
boot or in DOS environment.
Table 4-4: Legacy USB Support