On Mon, Sep 3, 2018 at 4:22 PM Ranran <ranshalit@xxxxxxxxx> wrote: > > On Mon, Sep 3, 2018 at 3:40 PM Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > > > On Mon, Sep 03, 2018 at 09:39:14AM +0300, Ranran wrote: > > > Hello, > > > > > > I try to add gadget configfs as described in: > > > https://www.kernel.org/doc/Documentation/usb/gadget_configfs.txt > > > Yet, I find nothing in /sys/class/udc: > > > > > > user@user-VirtualBox:~/tegra$ ls /sys/class/udc/ -al > > > total 0 > > > drwxr-xr-x 2 root root 0 Sep 3 00:30 . > > > drwxr-xr-x 58 root root 0 Sep 3 00:30 .. > > > > > > I also don't have dwc2, but dwc3: > > > user@user-VirtualBox:~/tegra$ lsmod | grep dw > > > dwc3 90112 0 > > > ulpi 16384 1 dwc3 > > > udc_core 24576 2 dwc3,libcomposite > > > user@user-VirtualBox:~/tegra$ > > > > > > Kernel is 4.4.50. > > > > Why do you think the dwc3 driver will work here? Do you really have > > this hardware being emulated? > > > Hi, > > I check it with Intel's E3900. > In datasheet, I can't find it being described in details in datasheet, > yet being linked with another document ("see Section Little-Endian and > Big-Endian in the DWC SuperSpeed USB 3.0 Controller User Guide" ) > https://www.mouser.com/ds/2/612/atom-e3800-family-datasheet-915661.pdf > I have installed module dwc3 and also dwc2 (both compiled as modules), > but nothing appear in /sys/class/udc > I also tried to add all options in device-drivers->usb->usb > gadget->usb peripheral control into kernel, (not as modules, but built > into kernel). > Yet, on checking > ls /sys/class/udc > I only find dummy_udc.0 , and nothing else. > I suspect that there is no device controller supported with this com express (congatec type 10), probably this is the only explanations for the empty /sys/class/udc. Best Regards, ranran > Thank you for any idea, > ranran > > > And 4.4.50 is very old, please use a modern kernel please. > > > > thanks, > > > > greg k-h
