[Yaffs] YAFFS2 backward compatibility issue

Good morning all,



There seems to be a backward compatibility problem with YAFFS2



We have:

*         a former version of our instruments (Linux 2.6.16, YAFFS2 from
Apr 08th, 2006); 

*         and a new version (Linux 2.6.25.7, with latest YAFFS2
version).

When we are writing a large YAFFS2 partition on a NAND flash (572 Mega
bytes), the new YAFFS2 goes for wide t_nodes to optimize the accesses to
that partition, which is fine to me. Trouble is: when the partition was
first written by the older version with 16-bits wide t_nodes, the new
YAFFS2 cannot read again the partition written by the old YAFFS2.



I tried to select the menuconfig option "Disable wide t_nodes" in YAFFS2
sub-menu, but to no avail. The partition written by the old YAFFS2 seems
to be accessible from time to time, randomly; but most of the times, the
new YAFFS2 cannot read at all the directories and files written by the
old one (and the partition seems to contain only "lost+found"). If I
re-install the older versions though, I can see again that all my files
are still there...



So my question is: do you know of a way to make the file system backward
compatible?



Thanks for your reading, and thank you very much in advance for your
help.



Best wishes,



Jean-Loup