On Mon, Sep 3, 2018 at 4:50 PM Ranran <ranshalit@xxxxxxxxx> wrote: > > 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. > A fix for my last comment: usb device controller should be supported with conga-MA5 (contains Intel's appolo lake), so I am still not sure why I find /sys/class/udc empty. In congatec MA-5 document it is said: "The conga-MA5 offers six USB 2.0 interfaces on the COM Express connector including one USB 2.0 Dual Role port. The xHCI host controller in the SoC complies with USB standard 1.1 and 2.0 with high-speed, full-speed and low-speed USB signalling. Note USB Dual Role is only supported under Linux. The port is a standard USB Host port under Windows." Maybe some configuration in my .config is missing ? (I enabled all controllers in device-drivers->usb->usb-> gadget->usb peripheral control , so I am not sure what is still missing) Thank you for any idea, ranran > 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
