mcmer-open...@tor.at (Marcus MERIGHI), 2017.09.25 (Mon) 15:32 (CEST): > robert.d...@yahoo.fr (Robert Dazi), 2017.09.24 (Sun) 22:28 (CEST): > > Hi,I have a software (openocd) that needs to serially communicate > > with a board, but it can't because libusb throws > > LIBUSB_ERROR_NOT_SUPPORTED. > > To access a usb device using libusb, libusb provides a function > > returning a list of devices. But this function fills a field of the > > device structure only if the device pathname starts with "ugen", > > otherwise the field is set to NULL.But a NULL field leads to the > > _sync_gen_transfer to return "LIBUSB_ERROR_NOT_SUPPORTED". > > But my device is bound to cuaU1, and not to any ugen. > > This assumption of a "ugen" name is also in _access_endpoint. > > > > Do I need to patch libusb, or is it simply a mistake of mine > > You might try to tell the kernel *not* to attach the device to ucom(4). > > For a quick test whether that helps, do > a) reboot. > b) at the boot prompt type "-c", enter. > c) you will find yourself at a ukc> prompt. > d) type "disable ucom", enter.
this should be "disable uftdi" with my device. see below... > e) type "quit", enter. > f) boot will continue. > g) when plugging your ucom(4) device you should see your device *not* > attaching as ucom(4). > h) use the device as ugen(4). > > For a permanent solution, run config -o /bsd.new -e /bsd, do the > changes as above, then move /bsd /bsd.ori and /bsd.new to /bsd. mih...@gmail.com (Mihai Popescu), 2017.09.25 (Mon) 21:51 (CEST): > > You might try to tell the kernel *not* to attach the device to ucom(4). > It will attach like uftdi or other * found in ucom man page. > Dmesg is really needed! Mihai, you are correct. See below what happens with my uftdi(4) based device. 1) normal, without disabling: uftdi0 at uhub3 port 2 configuration 1 interface 0 "FTDI USB Serial Converter" rev 2.00/6.00 addr 3 ucom0 at uftdi0 portno 1 2) with ucom disabled: uftdi0 at uhub3 port 2 configuration 1 interface 0 "FTDI USB Serial Converter" rev 2.00/6.00 addr 3 ucom at uftdi0 portno 1 not configured 3) with uftdi disabled: ugen0 at uhub3 port 2 "FTDI USB Serial Converter" rev 2.00/6.00 addr 3 Robert, what you want is 3) ? Marcus
