[Yaffs] Reg. writing to flash which is configured as yaffs

Hi,
I have YAFFS file system in my flash memeory.
Part of the flash is configured as yaffs.
If i want to write my databse to flash what i have to do.
i couldn't use nandwrite, nanddump command
I am writing an application to write my database to flash which is
configured as YAFFS.
I tried using yaffs_open, yaffs_close
But i was not able to open and close those flash areas which is configured
as yaffs.

If i want to write some data to flash mem configured as YAFFS how to do.

Pls. resolve this.


Regards,
Kirthika