最近新买的MT7620a开发板,看芯片的资料,发现有uartlite和uart两个串口,默认的boot口是uartlite,想扩展uart口用于串口通信,根据文档修改了mt7620a.dtsi和MT7620a.dts两个文件,发现boot打印出来的信息好像已经正常将io/uart复用口使能为uart了,但是通过测试还是不能使用,用示波器测量,发现一直为高电平,求大神指导!!
附上我的mt7620a.dtsi文件:
想在MT7620a上扩展uart口,发现正常使能了uart口,但是还是不能正常使用
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6条回答 默认 最新
- 清汤一碗 2016-01-31 06:56关注
我的dts文件:
/dts-v1/; /include/ "mt7620a.dtsi" / { compatible = "ralink,mt7620a-eval-board", "ralink,mt7620a-soc"; model = "Ralink MT7620a + MT7610e evaluation board"; palmbus@10000000 { uart@500{ status = "okay"; pinctrl-names = "default"; pinctrl-0 = <&uartf_gpio_pins>; }; spi@b00 { status = "okay"; m25p80@0 { #address-cells = <1>; #size-cells = <1>; compatible = "en25q64"; reg = <0 0>; linux,modalias = "m25p80", "en25q64"; spi-max-frequency = <10000000>; partition@0 { label = "u-boot"; reg = <0x0 0x30000>; read-only; }; partition@30000 { label = "u-boot-env"; reg = <0x30000 0x10000>; read-only; }; factory: partition@40000 { label = "factory"; reg = <0x40000 0x10000>; read-only; }; partition@50000 { label = "firmware"; reg = <0x50000 0x1fb0000>; }; }; }; }; pinctrl { state_default: pinctrl0 { gpio { ralink,group = "i2c"; ralink,function = "gpio"; }; }; }; ethernet@10100000 { status = "okay"; pinctrl-names = "default"; pinctrl-0 = <&rgmii1_pins &rgmii2_pins &mdio_pins>; ralink,port-map = "llllw"; }; wmac@10180000 { ralink,mtd-eeprom = <&factory 0>; }; gsw@10110000 { ralink,port4 = "gmac"; }; sdhci@10130000 { status = "okay"; }; pcie@10140000 { status = "okay"; }; gpio-keys-polled { compatible = "gpio-keys"; #address-cells = <1>; #size-cells = <0>; poll-interval = <20>; s2 { label = "S2"; gpios = <&gpio0 1 1>; linux,code = <0x100>; }; s3 { label = "S3"; gpios = <&gpio0 2 1>; linux,code = <0x101>; }; }; ehci@101c0000 { status = "okay"; }; ohci@101c1000 { status = "okay"; }; };
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