Jetson USB 3.0 doesn't work


I am using Jetson TK1 and I have flashed L4T21.7 on it. I have also upgraded the ubuntu to 16.04. I want to activate the USB3.0. I have already changed the parameter “usb_port_owner_info” in the /boot/extlinux/extlinux.conf but it didn’t activate the USB3. Instead, the port has disappeared from the lsusb and have stopped working. I have a lot of configuration on this board so I would not want to reflash it. How can I turn USB3 on without reflashing the board?