Biostar H77MU3 Bios Manual - Page 17
XHCI Hand-Off - drivers
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H77MU3 UEFI BIOS Manual USB3.0 Support This item enables or disables USB3.0 (XHCI) Controller support. Options: Enabled (Default) / Disabled XHCI Hand-Off This is a workaround for OSes without XHCI hand-off support. The XHCI ownership change should be claimed by XHCI driver. Options: Enabled (Default) / Disabled EHCI Hand-Off This is a workaround for OSes without EHCI hand-off support. The EHCI ownership change should be claimed by EHCI driver. Options: Disabled (Default) / Enabled Port 60/64 Emulation This items enables I/O port 60h/64h emulation support. This should be enabled for the complete USB keyboard legacy support for non-USB aware OSes. Options: Enabled (Default) / Disabled USB transfer time-out The time-out value for Control, Bulk, and Interrupt transfers. Options: 20 sec (Default) / 1 sec / 5 sec / 10 sec Device reset time-out The item sets USB mass storage device Start Unit command time-out. Options: 20 sec (Default) / 10 sec / 30 sec / 40 sec Device power-up delay "Auto" uses default value: for a Root port it is 100ms, for a Hub port the delay is taken from Hub descriptor. Options: Auto (Default) / Manual Device power-up delay in seconds Delay range is 1 ~ 40 seconds, in one second increments. Options: 5 (Default) 16