[Buildroot] EXT2-fs error

[Johnny Beardsmore]

> You have mistakenly unselected the generation of an ext2 image in
> "Target filesystem options". The generation of an ext2 image is enabled
> by default when you start a fresh configuration, so if it's not
> enabled, it's because you have unselected it somehow.

What does creating this file allow me to do (other than apply the previously mentioned e2fsck to it)?  I assume I'll still be transfering all the same stuff to the target, but do I also include this file, and if so, where should it be located?
 		 	   		  
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