Hello,
Check the user guide in C:\Freescale\Freescale_MQX_4_0\doc\ffs
And the demo project: C:\Freescale\Freescale_MQX_4_0\ffs\examples\mfs_nandflash
You have to build the FFS MQX library for your target and run the example.
Check the document C:\Freescale\Freescale_MQX_4_0\doc\ FSL_MQX_FFS_release_notes.pdf "5.2. Understand MFS NAND Flash example”
Luis