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3.3.6 USB Configuration
Legacy USB Support
Use this option to select legacy support for USB devices. There are two
configuration options: [Enabled], and [UEFI Setup Only]. The default value
is [Enabled]. Please refer to below descriptions for the details of these four
options:
[Enabled] - Enables support for legacy USB.
[UEFI Setup Only] - USB devices are allowed to use only under UEFI
setup and Windows / Linux OS.
XHCI Hand-off
This is a workaround for OSes without XHCI hand-off support. The XHCI
ownership change should be claimed by XHCI driver.