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Yes, TRB245 support UART debugging. I am also providing the pinout in the table below:
The pins are on the PCB on the side of ethernet port.
There is no support for uboot console.
You can upgrade firmware using bootloader if that is why you need to reach the uboot console.
Thank you for the reply. Could you please confirm and label according to the below attached photo?
Pin 8 TX other side RX, pin 6 GND