I have been writing a FAT32 driver to understand the FAT32 file system. It is very exciting as this is my first time I am dabbling with file systems. I will be porting this to my baremetal firmware for the MINI2440 SBC.
The idea to write a tiny modular driver came to me because of need. Sometimes developers do not need a write and simply need to read a file. Sometimes they want a very minimal read and then would like to write. This would be in case of storing ADC samples and then transferring it via a wireless interface or if a USB is connected they would want to mount the space as a drive.
I stumbled on it randomly several months ago. I suspect that a) it might be interesting to read through and b) might help add resiliency.