[Yaffs] mkyaffs for YAFFS2?

I am trying to get a YAFFS2 filesystem running on my development board. Can
anyone tell me if the utility mkyaffs exists for YAFSS2 or will I just have
to modify my bootloader to be able to correctly write out the image created
with mkyaffs2image which is the only utility in the source that I
downloaded?

Thanks.

Ross S.