mklittlefs  {-c <pack_dir>|-u <dest_dir>|-l|-i} [-d <0-5>] [-b <number>]
               [-p <number>] [-s <number>] [--] [--version] [-h]
               <image_file>


Where: 

   -c <pack_dir>,  --create <pack_dir>
     (OR required)  create littlefs image from a directory
         -- OR --
   -u <dest_dir>,  --unpack <dest_dir>
     (OR required)  unpack littlefs image to a directory
         -- OR --
   -l,  --list
     (OR required)  list files in littlefs image
         -- OR --


   -d <0-5>,  --debug <0-5>
     Debug level. 0 means no debug output.

   -b <number>,  --block <number>
     fs block size, in bytes

   -p <number>,  --page <number>
     fs page size, in bytes

   -s <number>,  --size <number>
     fs image size, in bytes

   --,  --ignore_rest
     Ignores the rest of the labeled arguments following this flag.

   --version
     Displays version information and exits.

   -h,  --help
     Displays usage information and exits.

   <image_file>
     (required)  LittleFS image file

$ mklittlefs --version

./mklittlefs  version: 0.2.3-6-g9a0e072

docker run --user $(id -u):$(id -g) --rm -v $(pwd):/workdir earlephilhower/gcc-cross bash -c "cd /workdir; bash build-cross.sh"