OpenWrt 内核阶段导出dtb为dts

1. /sys/firmware/fdt 该文件表示原始DTB文件，可用hexdump -C /sys/firmware/fdt 查看

2. scp拷贝fdt到Host主机中

   scp    /sys/firmware/fdt root@192.168.0.1:/home/book/tmp
   

3. 转换fdt为dts文件

   cd /home/book/tmp
   dtc -I dtb -O dts -o cp01-c2.dts  fdt
   
   #最终的dts文件为cp01-c2.dts,
   

4. 加入工程编译

   以高通的qca/src/linux-4.4/arch/arm64/boot/dts/qcom/qcom-ipq6018-cp01-c2.dts为例说明：

   • 用if 0先屏蔽以前的，#else中加入cp01-c2.dts里面的所有内容

     #if 0
     /dts-v1/;
     
     
     #include "qcom-ipq6018-cp01.dtsi"
     #include "qcom-ipq6018-rpm-regulator.dtsi"
     #include "qcom-ipq6018-cpr-regulator.dtsi"
     #include "qcom-ipq6018-cp-cpu.dtsi"
     #include "qcom-ipq6018-ion.dtsi"
     / {
     	model = "Qualcomm Technologies, Inc. IPQ6018/AP-CP01-C2";
        //此处省略N行
     };
     
     
     #else
     
     
     //面是拷贝的刚生成的cp01-c2.dts里面的所有内容
     /dts-v1/;
     #include "qcom-ipq6018-cp01.dtsi"
     ///memreserve/	0x00000000484ea000 0x0000000000014000;
     / {
     	soc_version_minor = <0x0>;
     	soc_version_major = <0x1000000>;
     	cpu_type = <0xa6010000>;
     	flash_type = <0x7000000>;
     	rpm_version = [43 52 4d 2d 52 50 4d 2e 42 46 2e 32 2e 34 2e 31 2d 30 30 30 38 39 0a];
     	tz_version = [43 52 4d 2d 54 5a 2e 57 4e 53 2e 35 2e 31 2d 30 30 31 32 37 0a];
     	boot_version = [63 72 6d 2d 75 62 75 6e 74 75 31 32 31 2d 42 4f 4f 54 2e 58 46 2e 30 2e 33 2d 30 30 30 39 38 2d 49 50 51 36 30 78 78 4c 5a 42 2d 31 0a];
     	machid = <0x1000308>;
       //此处省略N行
     };
     

5. 编译后烧录即可