TS-TPC-7990 USB OTG
From embeddedTS Manuals
The TS-7990 brings out a USB device port on P1 which can allow the board to act as a USB device. Several devices are compiled into the default kernel. Additional devices can be compiled into the kernel by following the section here.
USB Serial
modprobe g_serial use_acm=1
This will create a /dev/ttyGS0. See the kernel documentation for more information:
USB Ethernet
modprobe g_ether
This provides a usb0 network interface which simulates an ethernet network connection between the host pc and the i.MX6.