Serial on Pi Zero

openBalena
1

I started with a production version of the operating system image.

Then after flashing the image, mounted the sd card.

Edited the config.txt in resin-boot partition.
Added enable_uart=1

Then inserted into pi Zero

But after reboot I still do get the /dev/ttyS0 and the /dev/ttyAMA0 does also not work.

What is the correct way to enable this on openBalena

2

It looks like I have solved it.

From https://www.balena.io/docs/reference/OS/advanced/#modifying-configtxt-remotely

The config.txt is located in the root of the balena-boot partition, and you can modify it by mounting the SD card on a computer. This will only work if you edit the SD card before the device's first boot.

So I had to edit the config.txt before the first boot.

3

Hi,

Good to know that you found the solution from our docs, here is another link that could be useful for you https://www.balena.io/docs/learn/develop/hardware/i2c-and-spi/#serial.

Please let us know how it goes or if you need further support.