/opt/yocto/src/
      yocto-sumo-multi/
        sources/                 # All layers etc. as per freescale repo
        build-qemuarm/           # Per-machine build dir
        build-rpi3/              # Per-machine build dir
        ...
      yocto-thud-multi/
        ...                      # As per 'yocto-sumo-multi' above
      yocto-dunfell-multi/
        ...                      # As per 'yocto-sumo-multi' above
/opt/yocto/share/
  sources/
    sumo/                        # dl_dir cache for 'sumo'
    thud/                        # dl_dir cache for 'thud'
    dunfell/                     # dl_dir cache for 'dunfell'
  sources-private/     ... For non-downloadable sources
  sstate/
    2.5/                         # sstate cache built from common full image builds
    2.6/
    3.1/