040000 tree 185f61b1f9adef2cffb0959d13dfebf5c3fa4cc3	dummy
040000 tree d214d4c1cd05682b1106d60dd0524996b4e5750b	freertos
040000 tree 046cd26d1f6a0637b0321c90c0122b679bfc0923	linux
040000 tree e1e1d6cf4210bd881aba5b950d4ad42705559a60	mynewt
040000 tree 9636bd74a4ce60e72db269f4302244797ce51524	nuttx
040000 tree d01f71fdaea0fde3eec20ce574b5b3416cffa082	riot