Thank you for your mail! I used ths CVS patch folder file to resolved this problem! By the way, what it the root cause for this problem? Tyler Li LiYong wrote: > I downloaded the newest CVS tarball through webcvs and used it in Linux > 2.6.14 on ARM 9 cpu. > > On the 2K page Nand flash, after mount this nand flash as a Yaffs2 file > system, I can copy files to it. However, After umount and remout this nand > flash, all files I copied are missing! > > How to narrow down this problem? This is the symptom seen when YAFFS2 is used with stock mtd. You need a patch to the YAFFS2 mtd interface file. The patch can be found in the mailing list archive. Sekhar Nori.