全志Tina Linux 修改串口（UART0-＞UART1）

说明：本人使用的是F133-A(D1s)

1.修改boot0和uboot的串口

1.1.修改sys_config.fex文件。

1）文件路径为:tina-d1-h/device/config/chips/d1s/configs/nezha/sys_config.fex

修改前：

[uart_para]
uart_debug_port = 0
uart_debug_tx   = port:PF2<3><1><default><default>
uart_debug_rx   = port:PF4<3><1><default><default>

修改后：

[uart_para]
uart_debug_port = 1
uart_debug_tx   = port:PG06<2><1><default><default>
uart_debug_rx   = port:PG07<2><1><default><default>

其中<3>改为<2> 需要查阅数据手册（D1s_Datasheet_V1.0）中 PG6、PG7 的UART1是 Function2 得知的

1.2.修改UBOOT CONSOLE INDEX

1）路径为：tina-d1-h/lichee/brandy-2.0/u-boot-2018/configs/sun20iw1p1_defconfig

2）在最后添加

CONFIG_SPECIFY_CONSOLE_INDEX=y
CONFIG_CONS_INDEX=2	   #说明：这里是UART 1+1 = 2  串口号+1 （注意，这个注释记得去掉，否则编译报错）

2.修改kernel的串口

2.1.修改设备树（kernel使用的串口输出）

1）文件路径为：tina-d1-h/device/config/chips/d1s/configs/nezha/board.dts

修改前：

&uart0 {
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&uart0_pins_a>;
	pinctrl-1 = <&uart0_pins_b>;
	status = "okay";
};

&uart1 {
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&uart1_pins_a>;
	pinctrl-1 = <&uart1_pins_b>;
	status = "disabled";
};

&uart2 {
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&uart2_pins_a>;
	pinctrl-1 = <&uart2_pins_b>;
	status = "disabled";
};

&uart3 {
	compatible = "allwinner,sun20iw1-dsp-uart";
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&uart3_pins_a>;
	pinctrl-1 = <&uart3_pins_a>;
	status = "disabled";
};

修改后：

&uart0 {
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&uart0_pins_a>;
	pinctrl-1 = <&uart0_pins_b>;
	status = "disabled";	//修改的地方：关闭
};

&uart1 {
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&uart1_pins_a>;
	pinctrl-1 = <&uart1_pins_b>;
	status = "okay";		//修改的地方：打开
};

&uart2 {
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&uart2_pins_a>;
	pinctrl-1 = <&uart2_pins_b>;
	status = "disabled";
};

&uart3 {
	compatible = "allwinner,sun20iw1-dsp-uart";
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&uart3_pins_a>;
	pinctrl-1 = <&uart3_pins_a>;
	status = "disabled";
};

2.2.修改启动bootargs

1）路径为：tina-d1-h/device/config/chips/d1s/configs/default/env.cfg

修改前：

#kernel command arguments
earlyprintk=sunxi-uart,0x02500000
initcall_debug=0
console=ttyS0,115200

修改后：

#kernel command arguments
earlyprintk=sunxi-uart,0x02500400
initcall_debug=0
console=ttyS1,115200

说明：earlyprintk=sunxi-uart,0x02500000 需要修改为 UART1 的地址，查阅手册可知为 0x02500400