Nothing in /sys/class/udc

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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



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