UART

Hardware interface

Core-3588SG The following figure shows the serial port of the hardware
version：


DTS config

File path "kernel-5.10/arch/arm64/boot/dts/rockchip/rk3588-firefly-
port.dtsi"

   &uart0 {
       status = "okay";
       pinctrl-names = "default";
       pinctrl-0 = <&uart0m2_xfer>;
   };

   &uart3 {
       status = "okay";
       pinctrl-names = "default";
       pinctrl-0 = <&uart3m2_xfer>;
   };

   &uart4 {
   	status = "okay";
   	pinctrl-names = "default";
   	pinctrl-0 = <&uart4m0_xfer>;
   };

   &uart5 {
   	status = "okay";
   	pinctrl-names = "default";
   	pinctrl-0 = <&uart5m1_xfer>;
   };

After the serial port is configured, the node corresponding to the
hardware interface

   UART0:   /dev/ttyS0
   UART3:   /dev/ttyS3
   UART4:   /dev/ttyS4
   UART5:   /dev/ttyS5

UART send and receive

The easiest way to do this is to stub the UART0 TX RX pin and then use
the command to execute the command in the debug serial port or ADB

   busybox  stty -echo -F /dev/ttyS0          # Close the echo
   cat /dev/ttyS0 &                           # Get /dev/ttyS0 
   echo "firefly uart test..." > /dev/ttyS0   # Input string

The final debugging serial port terminal can receive the string
"firefly uart test..."