Re: spiffs (in)compatilibity

[Gregory Nutt]

Maybe it would be better to track upstream spiffs. I don't know whether the
spiffs implementation in NuttX requires any changes from upstream but if so
maybe they can be upstreamed as well.
Not compatible.  The NuttX version was a major re-implementation with 
major changes.  The original worked on bare metal.  Even just following 
the NuttX coding standard makes code difficult to consider updating or 
upstreaming.