How to change console UART in Armbian?

#1

Hello,

How can I change the default console UART port from UART2 to UART0 in Armbian image: Armbian_22.05.0-trunk_Rockpi-s_bullseye_current_5.15.32_minimal?

#2

Armbian has limited out of the box overlay support so you will first create an overlay for UART2, and use armbian-add-overlay to add it. Reboot and find out which /dev/ttyS* is UART2, and you should be able to modify /boot/armbianEnv.txt to have the right serial device listed under console.

#3

I have replied a similarly question, for enable more UART ports, follow then (read all):
https://forum.radxa.com/t/uart2-is-busy-uart4-does-not-works/1237/4?u=adryanalencar

  1. First you need enable other UART peripherals (described in link)
  2. Setup then in `/boot/uEnv.txt boot settings file

Note: the linux kernel remap a serial ports on /dev/ttySX. X represents the index of uart, sequentially by number of enabled drivers;

verbosity=7
fdtfile=rockchip/rk3308-rock-pi-s.dtb
console=ttyS0,1500000n8 <====== Change console UART here
overlays=rk3308-uart0, rk3308-uart2 <====== You can add UARTs drivers on there
rootuuid=ee60d2e1-358c-467c-acc8-a147c5b38695
initrdsize=0x5c96f8
kernelversion=4.4.143-55-rockchip-g6b7accbc999b
initrdimg=initrd.img-4.4.143-55-rockchip-g6b7accbc999b
kernelimg=vmlinuz-4.4.143-55-rockchip-g6b7accbc999b