(BeagleBoneBlack)ubuntu@localhost:~$ ls -al /boot/uboot/
total 9
drwxr-xr-x 4 root root 1024 Jul 23 15:33 .
drwxr-xr-x 4 root root 4096 Jul 23 12:58 ..
drwxr-xr-x 3 root root  512 Jul 17 16:15 a
drwxr-xr-x 3 root root  512 Jul 17 16:15 b
-rwxr-xr-x 1 root root  363 Jul 17 16:15 install.yaml
-rwxr-xr-x 1 root root 1585 Jul 23 15:33 snappy-system.txt
-rwxr-xr-x 1 root root  294 Jul 17 16:15 uEnv.txt