040000 tree f29008a5ccc6e25de128f05a45699e1494a49a27	boot_serial
040000 tree ef19f032f42eb80ac1a087c0aba940d6e117b048	bootutil
040000 tree 0557a0239ec7b379cfda8ac38263c6bdc6a1d8f6	mynewt
040000 tree a8d4e2e5dcde6cbb1b318991b509eaefa57d8379	zephyr