RK3568禁用调试口改成普通口

RK3568共10个串口，需要用到8个串口，无耐其他UART都被外设复用了，只好将调试口也拿出来作为普通口，方法：禁用调试口、增加UART2

1. 

vi kernel/arch/arm64/boot/dts/rockchip/OK3568-C-linux.dts

2. 

#include "OK3568-C-common.dtsi"/ {chosen: chosen {//bootargs = "earlycon=uart8250,mmio32,0xfe660000 console=ttyFIQ0 root=PARTUUID=614e0000-0000 rw rootwait";bootargs = "root=PARTUUID=614e0000-0000 rw rootwait";};
};

3. 

vi kernel/arch/arm64/boot/dts/rockchip/OK3568-C-common.dtsi

4. 

修改

 fiq-debugger {compatible = "rockchip,fiq-debugger";rockchip,serial-id = <2>;rockchip,wake-irq = <0>;/* If enable uart uses irq instead of fiq */rockchip,irq-mode-enable = <1>;rockchip,baudrate = <115200>;  /* Only 115200 and 1500000 */interrupts = <GIC_SPI 252 IRQ_TYPE_LEVEL_LOW>;pinctrl-names = "default";pinctrl-0 = <&uart2m0_xfer>;status = "disabled";};

增加

&uart2 {status = "okay";pinctrl-names = "default";pinctrl-0 = <&uart2m0_xfer>;
};

编译即可