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• Create a new folder in a known existing folder via mkdir rootfs
• Change into the new folder via cd rootfs
  
• Clone the git repository via git clone https://github.com/buildroot/buildroot
  
• Change into the new folder via cd buildroot
• Look into the branch overview inside the repository via git branch -a
  
• Select one of the branches and check it out via git checkout <selection>
• Open the buildroot configuration dialogue via make nconfig
• Configure the buildroot in this window:
  • Target options → Target Architecture → ARM (little endian)
  • Target options → Target Architecture Variant → cortex-A9
  • Target options → Target ABI → EABI
  • Target options → Enable NEON SIMD extension support
  • Target options → Floating point strategy → NEON
  • Toolchain → Toolchain type → Buildroot toolchain
  • System Configuration → System hostname → <Select a name>
  • System Configuration → System banner → <Select a system banner>
    
  • System Configuration → Init System → BusyBox
    
  • System Configuration → /dev management → Dynamic using devtmpfs only
    
  • System Configuration → Enable root login with password
    
  • System Configuration → Root password → root
    
  • System Configuration →Enable Run a getty (login prompt) after boot
    
  • Filesystem images → Enable tar the root filesystem
• Save the configuration via F6 → Enter → Enter
• Exit the configuration menu via F9
• Configure BusyBox if desired via make busybox-menuconfig
• Generate the root filesystem via make all
• After compilation, which can can last a longer time, the root filesystem (rootfs.tar) should be in folder buildroot/output/images/

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