why uart0 pin change need to modify nrf9160_pca10090.overlay in PSM but i2c need to modify nrf9160_pca10090ns.overlay in app

[bbslhb]

Hello:

I want to change uart0 tx and rx pin from default 28 and 29 to 10 and 11.

I know the i2c pin change need to change nrf9160_pca10090ns.overlay in app.

So I tried to add uart0 description in nrf9160_pca10090ns.overlay in my app but have no effect.

I tried to modify uart0 pin config in nrf9160_pca10090.overlay in PSM and successed to change uart pins.

I think uart0 and i2c configuration both can be changed in nrf9160_pca10090ns.overlay in app.

Can you tell me why uart0 change need to modify  nrf9160_pca10090.overlay in PSM?

[Hakon]

Can you tell me why uart0 change need to modify  nrf9160_pca10090.overlay in PSM?

 Yes, you need to change it in SPM because SPM uses uart0 to print debug messages.