TYAN GC68A-B8056 Service Engineer's Manual page 207

Boot Option Priorities
Boot Option #1#2#3#4
Sets the system boot order.
Device Name / Disabled
Hard Drive BBS Priorities
Set the order of the legacy devices in this group
USB Device BBS Priorities
Set the order of the legacy devices in this group
Add New Boot Option
Add a new EFI boot option to the boot order
Delete Boot Option
Remove an EFI boot option from the boot order
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