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From: Hans Petter Selasky <hselasky@c2i.net>
To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
Date: Mon, 4 Jun 2012 17:00:41 +0200
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Cc: freebsd-hackers@freebsd.org
Subject: Re: reverse USB driver - is it possible?
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On Monday 04 June 2012 07:00:01 Wojciech Puchar wrote:
> > Have a look at:
> > 
> > sys/dev/usb/storage/ustorage_fs.c
> > 
> > Currently just implements a RAM disk. Patches are welcome.
> 
> many answers - contradicting itself. others says hardware is unable to do
> so, you say it is done. then - how to use it? any docs? :)

When USB was designed, they didn't think about what is called cross-over in 
the ethernet world. Therefore hardware is typically limited to host or device. 
Hardware that can do both is called OTG USB hardware.

--HPS