On Thu, Jan 14, 2010 at 03:41:36PM -0800, Ron Madrid wrote: > > > Hello all, > > > > > > I am working with a custom MPC8313 based board > > running > > > linux and want to have USB communication between my > > board > > > and a host machine. I would like to make a few > > > statements and find out if my assumptions are > > correct. > > > > > > 1. I need to write a gadget driver for my > > board. > > > > Yes, if the existing ones do not work with your hardware. > > I take it you are talking about the ethernet and serial ones? > If not I don't know what you mean by existing ones? No, I mean a usb gadget controller driver for your MPC8313 based board. > > > I do already know about the ethernet over usb drivers > > and > > > have tried them in the past. I want something > > more > > > direct and with less overhead. > > > > Why do you feel the ethernet gadget has too much overhead? > > I was under the impression that after calling send() or recv() > ethernet packets get assembled with the data and these would > then be put into the urbs. Am I wrong? No, that's correct, why is that a problem? > > Have you tried the serial one? > > I have not. But I think I'll give it a go. Worst case it'll > be a good exercise. > > I'm mostly worried about speed. I just want to be able to dump > data as quickly as possible. If the ethernet or serial drivers > are just as fast as writing my own I can go with those, but I > don't know if that is the case. If there are speed benefits > from writing my own, that's the route I'll take. The serial one should allow you to hit the maximum line-speed for your hardware, with no overhead for any extra protocols. So I would recommend using that one. good luck, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
