title: UART3 in Google Coral transmitting but not receiving
body: <p>I am using Google Coral DevKit and I  would like to connect UART3 (ttymxc2) with external device, I connect it to FTDI for debugging and I could send from coral but I couldn't receive. I managed to use UART1 Transmit &amp; Receive Successfully. But my requirement is to use UART3.</p>
  <p>any help?</p>