http://elm-chan.org/fsw/ff/en/appnote.html#lfn

Apart from using up 512 bytes RAM (which is not too bad), I didn't enable LFN because of the issues with MS patents... anyone know the details of this??

I saw the note on the fatfs site, that's why they made it configurable, I think if it's configurable in MP too then it should be okay...

If it's not enabled, it might be okay. But I probably can't ship the boards with it compiled in...

It's a shame, those short upper case file names are so 80s :D

This article: http://www.geek.com/chips/clever-linux-folk-find-way-around-microsoft-fat-file-system-patent-824951/ seems to imply that you're only in violation of the patent if you store both the short and long filenames at the same time.

Linux seems to have sidestepped the patent by only storing the long variant of the filename.

in this case I vote enable LFN by default