I want to do some experimentation with USB guest mode (showing the device as a mass storage device or ethernet controller or something else), but I need a USB 3.0 port as I'm trying to do something that requires more bandwith than USB 2.0 can provide.
So far I only have found some Up boards (the ones that look like a raspberry Pi clone but are actually using Intel SoCs for tablets, like Atom x5 and such), which claim to have one USB 3.0 OTG with guest capability.
Are there others that you are aware of?