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}