Fujitsu D3320 PRIMERGY BX2560 M2 Reference Manual page 39

I
If you use an operating system which does not support USB 3.0
(e.g Windows XP) it is recommended to choose the Disabled state
for xHCI Mode.
Smart Auto
Depending on whether operating system used supports USB 3.0
(xHCI Mode) or USB 2.0 (EHCI Mode) the following system boots
uses automatically the preset mode as long as the system has not
been without current
Auto
USB 3.0 devices work during the BIOS POST in USB 2.0 mode.
Operating systems with USB 3.0 support will switch to USB 3.0
mode during the operating system boot.
Enabled
During the BIOS POST all USB 3.0 devices will be operated in
USB 3.0 mode. For operating systems without USB 3.0 support
these devices will not be available to the operating system.
Disabled
USB 3.0 devices are functioning during BIOS POST as well as for
the operating system in USB 2.0 mode.
Legacy USB Support
Specifies whether Legacy USB Support is available. This function has to
be enabled or set to Auto if it may be necessary to boot the operating
system from a USB device.
Disabled
Legacy USB Support is not available. A USB keyboard or USB
mouse can only be used if supported by the operating system.
The operating system cannot be booted from a USB device
Enabled
Legacy USB Support is available. The USB keyboard or USB
mouse can also be used with operating systems that do not
support USB. The operating system can be booted from a USB
device.
Auto
Legacy USB Support will be disabled if no USB devices are
connected.
BX2560 M2
D3320 - BIOS Setup Utility
Advanced menu
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