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. Thank you for any idea, ranran