To run a flash filesystem, you need to select the appropriate flash driver for your target system. For details on the supported flash drivers, see the various devf-* entries in the Utilities Reference.
The flash filesystem drivers don't rely on any flash-specific .so files, so the only module required is the standard C library (libc.so).
Since the flash filesystem drivers are written for specific target systems, you can usually start them without command-line options; they'll find the flash for the specific system they were written for.