RK3399 更改输出log波特率为115200
修改uboot处的波特率配置：u-boot\configsrk3399_defconfigCONFIG_SYS_EXTRA_OPTIONS="RKCHIP_RK3399,PRODUCT_MID,NORMAL_WORLD,SECOND_LEVEL_BOOTLOADER,BAUDRATE=115200"
修改kernel处的波特率配置：
kernel\arch\arm64\boot\dts\rockchip\rk3399-nanopi4-common.dtsi
fiq_debugger: fiq-debugger {
compatible = "rockchip,fiq-debugger";
rockchip,serial-id = <2>;
rockchip,signal-irq = <182>;
rockchip,wake-irq = <0>;
rockchip,irq-mode-enable = <1>;/* If enable uart uses irq instead of fiq */
rockchip,baudrate = <115200>;/* Only 115200 and 1500000 */
pinctrl-names = "default";
pinctrl-0 = <&uart2c_xfer>;
};
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