RFC: blow Ethernet-over-USB into a module

Gilles Casse gcasse at oralux.net
Fri Aug 1 18:53:53 CEST 2008

Werner Almesberger wrote:
> But all these solutions still need protocol stack changes on both ends,
> right ? That makes them fairly unattractive unless it's something all
> relevant hosts implement ...

I have not yet had the chance to use compound gadgets. AIUI, a specific 
host driver is needed for composite gadgets, not for compound gadgets.

This paragraph ( from the USB2.0 spec defines compound devices:

"A function is a USB device that is able to transmit or receive data or 
control information over the bus. A function is typically implemented as 
a separate peripheral device with a cable that plugs into a port on a 
hub. However, a physical package may implement multiple functions and an 
embedded hub with a single USB cable. This is known as a compound 
device. A compound device appears to the host as a hub with one or more 
non-removable USB devices."


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