find USB v2.0 physical ports on the computer

[Wojciech Puchar]

> During the boot process I get these messages.
> I want to find the physical USB v2.0 ports on the computer box.
> How can I do this?
>
>
> usbus0: 12Mbps Full Speed USB v1.0
> usbus1: 12Mbps Full Speed USB v1.0
> usbus2: 12Mbps Full Speed USB v1.0
> usbus3: 480Mbps High Speed USB v2.0

but trying only.

plug any USB device and look at kernel output to what usbus it was 
attached.