Cannot set baud rate to UART /dev/ttyFIQ0

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Android 9 Source Code

To sum up, UART2 should be used as a common serial port. The following modifications are required: Firstly, confirm whether the voltage of serial device matches or not. uart2 config: &uart2 { status = "okay"; }; &fiq_debugger { rockchip,serial-id = <0xffffffff>; status = "okay"; }; read and write permission for this serial port is required --- a/init.rk30board.rc +++ b/init.rk30board.rc @@ -229,7 +229,9 @@ on boot chmod 0666 /sys/class/wol/rst_mcu #add for buzzer c…

What are you going to do with these two pins?
Maybe you can find the answer by the link above.