修改Tina Linux的调试串口

从串口0修改到串口3

需要修改

修改env.cfg文件

1	device/config/chips//configs/*/env.cfg

- earlyprintk=sunxi-uart,0x02500000
- console=ttyS0,115200

+ earlyprintk=sun02i-uart,0x0250C000 #为该串口的开始物理地址
+ console=ttyS3,115200

修改sys_config.fex（BOOT0与Uboot的串口）

1	device/config/chips//configs/*/sys_config.fex

[uart_para]
uart_debug_port = 3
uart_debug_tx   = port:PB06<复用功能序号><1><default><default>
uart_debug_rx   = port:PB07<复用功能序号><1><default><default>

修改设备树（Linux使用的串口输出）

开启UART3，并关闭其他UART3所占用引脚的使能。

1	device/config/chips//configs/*/board.dts

uart3_pins_a: uart3_pins@0 {
	pins = "PB6", "PB7";
	function = "uart0";
	drive-strength = <10>;
	allwinner,muxsel = <7>;
	bias-pull-up;
};

uart3_pins_b: uart3_pins@1 {
	pins = "PB6", "PB7";
	function = "gpio_in";
};

... ...

&uart3 {
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&uart3_pins_a>;
	pinctrl-1 = <&uart3_pins_b>;
	status = "okay";                                   # 开启UART3
};

修改启动登录参数(或改用其他文件系统

1	target/allwinner/***/base-files/etc/inittab

完成