040000 tree 1eeb098cb76194125f6717982d91bd2a3000e643	boot_serial
040000 tree 8aa8f48d8885dec05f98bd2bacd55fd8fbda107d	bootutil
040000 tree c615f214f3f240be2ef47921efae1f210f6fb6eb	cypress
040000 tree 4544bbb2c7fd2835c2d800ac75d1fd347003343a	mynewt
040000 tree c6f86234f475b368bb93c539e7c395f5f6a676a4	zephyr