Because I build my own kernels and don’t know what dietpi-config does for uart support, I wrote this dtso and applied it staticly for my investigating:
// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/dts-v1/;
/plugin/;/ {
<------>compatible = “hardkernel,odroid-n2-plus”;
};&{/aliases} { // &aliases
<------>serial1 = “/soc/bus@ffd00000/serial@24000”; // &uart_A;
};&{/soc/bus@ff600000/bus@34400/pinctrl@40} { // &periphs_pinctrl
<------>uart_a_pins: uart-a {
<------>};
};&{/soc/bus@ffd00000/serial@24000} { // &uart_A
<------>status = “okay”;
<------>pinctrl-0 = <&uart_a_pins>;
<------>pinctrl-names = “default”;
};