On Wed, Oct 10, 2012 at 10:34:59PM +0200, Peter Stuge wrote: > Hej Henrik, > > Henrik Rydberg wrote: > > commit 3d97ff63f8997761f12c8fbe8082996c6eeaba1a > > Author: Hans de Goede <hdegoede@xxxxxxxxxx> > > Date: Wed Jul 4 09:18:03 2012 +0200 > > > > usbdevfs: Use scatter-gather lists for large bulk transfers > > > > breaks an usb programming cable over here. The problem is reported as > > "bulk tranfer failed" [sic] by the tool, and bisection leads to this > > commit. Reverting on top of 3.6 solves it for me. > > > > I am happy to test alternatives. > > In order to make full use of the new kernel commit you also need > changes in libusb, if the tool uses libusb, but I agree that the > kernel change must under no circumstance cause existing userland > software to regress. Indeed. > What is the programming cable and software that uses it? The programmer is impact, using libusbx-1.0.14-1. The device runs the xusbdfwu firmware. The (usb 2.0) bulk endpoint says wMaxPacketSize 1x512 bytes, and bInterval 0. The patch is pretty generic, so I am suprised the problem has not shown up earlier. Henrik -- 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
