AAEON AEC-6643 - Manual (Page 42)

E m b e d d e d C o n t r o l l e r A E C - 6 6 4 3
USB Configuration
Options summary :
Enabled Optimal Default, Failsafe Default Legacy USB Support
Auto
Enables Legacy USB support. AUTO option disables legacy support if no USB
device are connected. DISABLE option will keep USB devices available only for EFI
applications.
Disabled Optimal Default, Failsafe Default EHCI Hand-off
Enabled
This is a workaround for OSes without EHCI ownership change should be claimed
by EHCI driver.
Chapter 3 AMI BIOS Setup 3-14