ASRock H510M-HDV/M.2 SE Software/BIOS Setup Guide - Page 50
USB Configuration, Legacy USB Support, XHCI Hand-off
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3.4.6 USB Configuration Legacy USB Support Allows you to enable or disable Legacy OS Support for USB devices. [Enabled] enables legacy USB support. [Disabled] keeps USB devices available only for EFI applications. [UEFI Setup Only] sets to support USB devices under the UEFI setup and Windows/Linux operating systems only. XHCI Hand-off This is a workaround for OSes without XHCI hand-off support. The XHCI ownership change should be claimed by XHCI driver. Configuration options: [Enabled] [Disabled] 46
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3.4.6
USB Configuration
Legacy USB Support
Allows you to enable or disable Legacy OS Support for USB devices.
[Enabled] enables legacy USB support.
[Disabled] keeps USB devices available only for EFI applications.
[UEFI Setup Only] sets to support USB devices under the UEFI setup and Windows/Linux
operating systems only.
XHCI Hand-off
°is is a workaround for OSes without XHCI hand-off support. °e XHCI ownership
change should be claimed by XHCI driver.
Configuration options: [Enabled] [Disabled]