File system customization

From project/image/configs/i2m/rootfs.mk, we can know that the smallest file system consists of project/image/rootfs/rootfs.tar.gz and project/image/busybox/busybox-1.20.2-arm-linux-gnueabihf -glibc-8.2.1-dynamic.tar.gz composition.
#vi project/configs/i2m/rootfs.mk
BUSYBOX comes from project/configs/nvr/i2m/8.2.1/spinand.glibc.011a.64

Therefore, we can customize the files by customizing project/image/rootfs/rootfs.tar.gz and project/image/busybox/busybox-1.20.2-arm-linux-gnueabihf-glibc-8.2.1-dynamic.tar.gz system.
The following describes the use of buildroot to customize the file system.

• Download buildroot-2020.05.tar.bz2 from buildroot official website, unzip and enter the unzip directory；
• Configure cross compilation chain
  
  #make menuconfig
  
• start to compile
  #make
• Repack
  After the compilation is complete, generate output/images/rootfs.tar, execute the following command to repackage:

  #mkdir output/images/rootfs
  #tar -xvf output/images/rootfs.tar -C output/images/rootfs
  #tar -cvf output/images/rootfs.tar.gz output/images/rootfs

• Replace the target file system
  #cp output/images/rootfs.tar.gz ../project/image/rootfs/rootfs.tar.gz -f
  • Close busybox
    Since the file system compiled with buildroot already contains busybox, the original busybox is no longer needed:
    #vi project/image/configs/i2m/rootfs.mk