Add todo

Author: fangpenlin

src/storage/spiflash.rs

@@ -53,6 +53,9 @@ impl SPIFlashStorage {
         // TODO: handle file system not formatted issue.
         //       looks like esp-idf-svc didn't implement error handling at this moment:
         //       https://github.com/esp-rs/esp-idf-svc/blob/6453bedd5967ebc3bcb7d240492a0d5164e818c2/src/io.rs#L130
+        // TODO: the f_mount called with async mode, it means the actual mount will only happen in
+        //       a file operation. Maybe we should leave file sys formatting to the end-user
+        //       instead? as it's a dangerous operation anyway....
         self.mounted_fatfs = Some(MountedFatfs::mount(fatfs, mount_path, max_fds)?);
         Ok(())
     }