I have been able to get the Getty port to work on UART3 (ttyLP0) by entering: systemctl enable serial-getty@ttyLP0.service
I have not been able to change the U-boot Debug port from UART1 (ttyLP1) to UART3 (ttyLP0). I have tried various settings in the U-boot Environment Variable: console and it seems to have no effect? Such as: setenv console ttyLP0,115200 or setenv console null.
Please provide some direction on altering the debug port.