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EdrZero

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    Yes, after almost a year I decided to look again and finally find the answer.
    This time I tried with UART4, change the pins and everything as I posted, and then, only one more step was needed to make it work.
     
    first, you have to read the file /boot/dtb/overlay/README.sun7i-a20-overlays
    in there you will find all the information about the overlays. 
     
    then go to /boot/armbianEvn.txt and put this at the end of the file:
     
    overlays=uart4
    param_uart4_pins=a
     
    then restart and Bingo!! UART4 now works like a charm!!!
     
    Hope this helps.

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