VAR-SOM-MX7 UART
From Variscite Wiki
VAR-SOM-MX7 - External UART
Test
By default, Variscite has configured UART2 (/dev/ttymxc1) in the device tree.
To test:
Use minicom to connect.
Set the serial to ttymxc1.
You can use a loopback or connect to another computer.
The pins are coming out from the J5 connector.