MSI IM-GM45 - Manual (Page 53)

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BIOS Setup
USB Configuration
Legacy USB Support
Set to [Enabled] if you need to use any USB 1.1/2.0 device in the operating
system that does not support or have any USB 1.1/2.0 driver installed, such as
DOS and SCO Unix.
USB 2.0 Controller Mode
This setting specifies the operation mode of the onboard USB 2.0 controller.
BIOS EHCI Hand-Off
This setting allows you to enable or disable a workaround for operating sys-
tems without EHCI (Enhanced Host Controller Interface) hand-off support. The
Enhanced Host Controller Interface (EHCI) specification describes the register-
level interface for a Host Controller for the Universal Serial Bus (USB) Revision
2.0.
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