全志芯片Tina Linux 修改 UART 引脚、UART端口 (2) |
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场景二:使用UART3,需要从UART0改为UART3(PB6,PB7)
修改sys_config.fex(BOOT0与Uboot的串口)
sys_config.fex 的路径是 device/config/chips/t113/configs/evb1/sys_config.fex 中的 uart_debug_port 修改前: [uart_para] uart_debug_port = 0 uart_debug_tx = port:PF02 uart_debug_rx = port:PF04修改后 [uart_para] uart_debug_port = 3 uart_debug_tx = port:PB06 uart_debug_rx = port:PB07 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 uart3_pins_a: uart3_pins@0 { pins = "PC6", "PC7"; function = "uart0"; drive-strength = ; allwinner,muxsel = ; bias-pull-up; }; uart3_pins_b: uart3_pins@1 { pins = "PC6", "PC7"; function = "gpio_in"; }; &uart0 { pinctrl-names = "default", "sleep"; pinctrl-0 = ; pinctrl-1 = ; status = "okay"; }; &uart3 { pinctrl-names = "default", "sleep"; pinctrl-0 = ; pinctrl-1 = ; status = "disabled"; };修改后 uart3_pins_a: uart3_pins@0 { pins = "PB6", "PB7"; function = "uart0"; drive-strength = ; allwinner,muxsel = ; bias-pull-up; }; uart3_pins_b: uart3_pins@1 { pins = "PB6", "PB7"; function = "gpio_in"; }; &uart0 { pinctrl-names = "default", "sleep"; pinctrl-0 = ; pinctrl-1 = ; status = "disabled"; # 关闭UART0 }; &uart3 { pinctrl-names = "default", "sleep"; pinctrl-0 = ; pinctrl-1 = ; status = "okay"; # 开启UART3 }; 修改UBOOT CONSOLE INDEX路径:brandy/brandy-2.0/u-boot-2018/configs/sun8iw20p1_defconfig 增加下列内容 CONFIG_SPECIFY_CONSOLE_INDEX=y CONFIG_CONS_INDEX=4 # UART 3+1 = 4 修改启动bootargs路径:device/config/chips/t113/configs/evb1/env.cfg 修改前 earlyprintk=sunxi-uart,0x02500000 initcall_debug=0 console=ttyS0,115200修改后 earlyprintk=sunxi-uart,0x02500000 需要修改为 UART3 的地址,查阅手册可知为 0x02500C00 make kernel_menuconfig 找到 Kernel low-level debugging functions,修改寄存器地址 原贴链接:https://bbs.aw-ol.com/topic/1673/ 全志在线开发者交流企鹅群(客服机器人24小时在线解答):498263967 资源获取、问题讨论可以到全志在线开发者社区进行:https://www.aw-ol.com 全志及开发者最新动态可以关注全志在线微信公众号 |
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