Allwinner chip Tina Linux modify UART pins, UART port (1)

aleksib

Allwinner chip Tina Linux modify UART pins, UART port (1) [Copy link]

 

#### Scenario 1: Also using UART0, need to change from PF2, PF4 to PE2, PE4 1. Modify `sys_config.fex` (serial port of BOOT0 and Uboot) The path of `sys_config.fex` is `uart_debug_port` in `device/config/chips/t113/configs/evb1/sys_config.fex` Before modification: ``` [uart_para] uart_debug_port = 0 uart_debug_tx = port:PF02<3><1><default><default> uart_debug_rx = port:PF04<3><1><default><default> ``` After modification``` [uart_para] uart_debug_port = 0 uart_debug_tx = port:PE02<6><1><default><default> uart_debug_rx = port:PE03<6><1><default><default> ``` The reason why `<3>` is changed to `<6>` is because we know from the data sheet that UART0 of PE2 and PE3 is Function6! [Insert picture description here](https://img-blog.csdnimg.cn/1933a55d2de44473bcc94b5a945ac9b1.png#pic_center) ``` port:PE02 <6><1><default><default> ^ ^ PE2脚引脚功能6（查阅datasheet得知） ``` 2. 修改设备树（Linux使用的串口输出） 路径：`device/config/chips/t113/configs/evb1/board.dts` 修改前 ``` uart0_pins_a: uart0_pins@0 {/* For EVB1 board */ pins = "PF2", "PF4"; function = "uart0"; drive-strength = <10>; allwinner,muxsel = <3>; bias-pull-up; }; uart0_pins_b: uart0_pins<a href="https://en.eeworld.com/bbs/home.php?mod=space&uid=490" target="_blank">@1</a> {/* For EVB1 board */ pins = "PF2", "PF4"; function = "gpio_in"; }; ``` 修改后 ``` uart0_pins_a: uart0_pins@0 {/* For EVB1 board */ pins = "PE2", "PE3"; function = "uart0"; drive-strength = <10>; allwinner,muxsel = <6>; bias-pull-up; }; uart0_pins_b: uart0_pins@1 {/* For EVB1 board */ pins = "PE2", "PE3"; function = "gpio_in"; }; ```</default></default></default></default></default></default></default></default></default></default>

IC爬虫

Thanks for sharing, the host is really great

lugl4313820

When using UART0, you need to change from PF2, PF4 to PE2, PE4. Thanks for sharing!

freebsder

For the record, changing pins is a common scenario.

jiangbianyeren

Watch, watch, MARK, watch strongly, even though I'm a newbie, hahahahaha