pico 动态加载设备树

• zg002

  Posts: 5

  Joined: 2024-10-26 6:58

  2024-10-28 15:17

  我希望

  使用脚本

  修改i2c的速度
  我的dtb文件如下：

  Code: Select all

                                                           
  /dts-v1/;
  /plugin/;
  
  &i2c3{
          status = "okay";
          clock-frequency = <500000>;
          pinctrl-0 = <&i2c3m1_xfer>;
  };
  

  我的脚本如下：

  Code: Select all

  nano i2c3_speed_overlay.dts 
  dtc -I dts -O dtb i2c3_speed_overlay.dts -o i2c3_speed_overlay.dtb
  cat i2c3_speed_overlay.dtb > /sys/kernel/config/device-tree/overlays/i2c3m1/dtbo
  echo 1 >/sys/kernel/config/device-tree/overlays/i2c3m1/status
  

  但是报如下错误：

  Code: Select all

  [147101.564062] OF: resolver: no symbols in root of device tree.
  [147101.564123] OF: resolver: overlay phandle fixup failed: -22
  [147101.564160] dtbocfg_overlay_item_create: Failed to apply overlay (ret_val=-22)
  

  原设备树如下：

  Code: Select all

  
  /**********I2C**********/
  /* I2C3_M1 */
  &i2c3 {
  	status = "disabled";
  	clock-frequency = <100000>;
  };
  

  我不知道哪里出现错误，尝试将i2c3更换成i2c3m1也不行

  • Quote

/dts-v1/;
/plugin/;
&{/i2c@ff460000}{
        status="okay";
        clock-frequency = <100000>;
};