We only have FatFs demo on MicroSD card, and I don't see any application on Nor flash devices by now.
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Adding to ShipingW_81, you could implement FatFS on NOR Flash but it is not recommended. Reasons being that, you need to erase the memory each time before writing. Based on the type of NOR Flash used, you will need to erase hundreds to kilobytes every time you write.
So simply adding an empty file in the file system will require you to re-write a huge portion of the file system itself, not only the entry for the new file.
However, if you plan to have a read-only file-system then it should be fine. But we don't have any reference examples on this.