040000 tree 356a644854f154a0d93df52d1fffde55e12e35fc	boot_serial
040000 tree 02f60f054185483b57c145694c5c86b008fe9f17	bootutil
040000 tree 0557a0239ec7b379cfda8ac38263c6bdc6a1d8f6	mynewt
040000 tree e1587d7b887efe591ef1cf26bb2d91bfc71ccffb	zephyr