(BeagleBoneBlack)ubuntu@localhost:~$ fw_printenv |grep ^snappy
snappy_ab=b
snappy_boot=if test "${snappy_mode}" = "try"; then if test "${snappy_trial_boot}" = "1"; then if test "${snappy_ab}" = "a"; then setenv snappy_ab "b"; else setenv snappy_ab "a"; fi; else setenv snappy_trial_boot 1; saveenv; fi; fi; run loadfiles; setenv mmcroot /dev/disk/by-label/system-${snappy_ab} ${snappy_cmdline}; run mmcargs; bootz ${loadaddr} ${initrd_addr}:${initrd_size} ${fdtaddr}
snappy_cmdline=init=/lib/systemd/systemd ro panic=-1 fixrtc
snappy_mode=regular
snappy_trial_boot=0