[Yaffs] yaffs on wince

hi
i have started work on porting yaffs on wince on s3c2410 processor

i was reading yaffs2004talk.pdf
under YAFFS Direct Interface u told that we have to provide 7 functions for
porting

4 functions are ynandif_WriteChunkToNAND, ynandif_ReadChunkFromNAND,
ynandif_EraseBlockInNAND and ynandif_InitialiseNAND
the implementation of these functions has reference to CreateFile and
DeviceIoControl

question
1) so i have to write a stream interface driver is this right ?( i am new to
wince)
2) regarding the other 3 functions(time stamping and mutex) which r these
functions?

Regards and Thanks,
Sharath Kumar DM