On Mon, 16 Jan 2012, Matthias Wieloch wrote: > Hello, > > I have some issues with USB device driver fort he AT91SAM9263 > microcontroller. I'm using Kernel 2.6.38 provided by buildroot 2011.08 and > it work well on the evaluation board (AT91SAM9263-EK) but now I'm facing > problems with my own board design. > As a first step I wanted to force my board to use low speed USB with a > pull-up resistor but that resulted in kernel errors on boot up. > > Is there a way to force low speed within the USB serial gadget driver? No. The serial gadget driver does not support low speed, because it relies on bulk endpoints. > Changing "udc->gadget.speed = USB_SPEED_FULL;" to USB_SPEED_LOW within the > IRQ function in at91_udc.c only changed the text shown on console when I > connect the board to a host PC. at91_udc.c doesn't support low-speed operation either. You can see this if you look at the at91_probe() routine, which talks about a D+ pullup but not D- and which sets various maxpacket sizes to 64, not 8. Alan Stern -- 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
