Can not get output from uart on BPI-R3?

Banana Pi Router design BPI-R3/R3 Mini(MT7986)
1

Hello everyone, I purchased this kit from Amazon. OpenWRT is already installed and functional. https://www.amazon.com/gp/product/B0BLVF9697

I can not get any output. I read that I may need to enable uart from within the OpenWRT first.

If so, how do I enable UART? The documentation from the wiki is a little lacking.

Interacting with uart is new to me so any advice is appreciated. I have access to the terminal console in OpenWRT.

I used sudo screen /dev/ttyUSB0 115280 to read off the usb connection after using modprobe to set it up.

2

Have you connected rx to tx and tx to rx of the 3pin connector?

https://wiki.fw-web.de/doku.php?id=en:bpi-r2:debug-uart

3

I have not. I will try that. Thank you frank-w. Remember reading about that.

4

@frank-w thank you for pointing that out.

The issue seemed to be I used a longer 3rd party one that reported garbled output.

I used the included one and it work perfectly. I was able to flash the eMMC from the sd card.