Openwrt directory structure

One : Directory structure

1. build_dir
   This is an intermediate folder , All the code will be copied into it and compiled , The code will be copied to this directory before compilation . Why copy ？ One reason is that during compilation OpenWrt Some of the code and makefile Make changes , For safety's sake , Compile the copy .
   Its contents and staging_dir As like as two peas ,staging_dir Namely build_dir Compilation results of the code in .
   • host:
     Platform independent tools 、 Library code
   • target-arm_cortex-a7+neon-vfpv4_musl-1.1.16_eabi:
     Tool chain source code
   • toolchain-arm_cortex-a7+neon-vfpv4_gcc-5.4.0_musl-1.1.16_eabi:
     Platform related code , There are some code packages ,packge Many code packages in will be copied to this directory for compilation , The code package you add should also be copied to this directory
2. staging_dir
   Directory saving tool 、 Compilation results of all code such as the kernel .
   • host：
     Folders are platform independent artifacts .
   • target-arm_cortex-a7+neon-vfpv4_musl-1.1.16_eabi：
     Based on the platform and chip we selected , The compilation results of the corresponding platform . For example, the library file and header file of the corresponding platform .
   • toolchain-arm_cortex-a7+neon-vfpv4_gcc-5.4.0_glibc-2.24_eabi：
     Cross compile tool chains and library files generated according to the selected platform .
3. dl
   dl Download directory for source code , Source code packages downloaded during compilation will be saved in this folder
4. feeds
5. files
6. package
   This directory mainly stores OpenWrt Software package , The application layer code we add should be stored in this folder , The code package is stored in this folder and the corresponding Makefile after , During the compilation process OpenWrt Be able to identify and compile .
   package The directory under will vary according to the configuration , Most of them are openwrt Some application toolkits for , such as utils Is a tool set ,ls,ssh The source code of such tools are in this directory
7. target
   target The directory mainly contains the code related to the platform , The main thing is linux Folder . Here's the picture ：
   
   You can see that each platform corresponds to a folder , adopt "make menuconfig" This folder corresponds to the platform and chip selection :
   
   You can see that there are a variety of chip models , Of these image It will be called when the firmware is finally generated , Here you can customize some of our firmware ,patches There are patches .base-files Directory and linux The directory corresponds to , Many places have this folder .
8. tool
   Toolset
   
9. include
   
   Top common Makefile, Other Makefile Contains Makefile Can be found here .
10. scripts
    Scripting tools

Two : kernel patch

3、 ... and : File system automatically built-in files