FreeBSD doesn't boot at Supermicro H8SSL-i2

[Thomas Krause]

>>
> Check that the USB speed setting in the BIOS is set to its defaults,
> either HiSpeed or FullSpeed, I don't remember exactly.  If I change
> it, it similarly hangs on boot, but I'm using FreeBSD/amd64 on it.

Thanks very much for your hint! FreeBSD boots with

USB 2.0 Controller Mode: Fullspeed

*and*

BIOS EHCI Hand-off: Enable

BTW: There is no way to disable USB completely?

Regards,
Thomas.