Using FAT Filesystem on the Macronix memory on the nRF9160-DK

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Is there sample code to use a FAT Filesystem on the Macronix memory on the nRF9160-DK?
The full_modem_update sample uses the Flash but not as a filesystem.

It would be great to have a sample or even for mounting it.
Do I need a device tree overlay?
What is required in the mount data structures for the flash and the

Also, if our requirements for persistent storage change, it would be great to use the SD.
In addition to populating the SD socket, what is required?
It appears from the DevZone others have made it work but none of the posts offers a complete solution.

[Hakon]

The sample needs to be configured to use the partition manager. I will let you know when that is in place.