I am currently using the UART0 (Console) Pins on J3 for a UART. Their is a overlay suggested in the “Beaglebone Interface spec.org.html” as bone4. The ke-j721e-beagleboneai64-busses.dtsi suggest using “bone/uart/4” but currently is a TODO. This option would then allow mapping to P9_13, and P9_11.
The method I am currently using to use UART0 as a UART on J3 is as follows:
- $ sudo systemctl stop serial-getty@ttyS2.service
- $ sudo chmod g+r ttyS2
- $ sudo chown root:dialout ttyS2
And to restart
- $ sudo systemctl start serial-getty@ttyS2.service