Orange Pi 5 + Serial port UART1

Place the file rockchip-rk3588-uart1-m1.dtbo in /boot/dtb/rockchip/overlay

~$sudo cp rockchip-rk3588-uart1-m1.dtbo /boot/dtb/rockchip/overlay

Edit armbianEnv.txt

~$sudo nano /boot/armbianEnv.txt

verbosity=1
bootlogo=false
overlay_prefix=rockchip-rk3588
overlays=uart1-m1

fdtfile=rockchip/rk3588s-orangepi-5.dtb

....

~$sudo reboot

~$ls /dev/ttyS*

/dev/ttyS1  /dev/ttyS9

~$screen /dev/ttyS1 1200

You should see teleinfo stream

(Ctrl A k y to exit from screen)

You can also add a link in /dev/serial/by-id to allow some software like domoticz to "view" the port:

~sudo ln -s /dev/ttyS1 /dev/serial/by-id/ttyS1_GPIO