When using the shell_module project of SDK v3.0.1, I changed uart20 to pins p2.0 and p2.2, and the serial port printed garbled text.
Below is my overlay file:
Strangely, when I configured uart00 at the same time, uart20 printed normally. The issue is that in my project, pin 00 will be used as spi00, so the UART can only be set to 20 or 21.
Enabling uart00:
Using this reset on the DK board does not cause garbled text, but pressing the reset button or repowering the board still results in garbled text.
shell_module.7z