Zhao, did JFFS2 work in your test in this case: 1. flash_eraseall -j /dev/mtd0 flash_eraseall is *old*, it puts cleanmarkers and is not EBH-aware. 2. mount jffs2 3. copy any file to jffs2 4. unmount 5. mount ? -- Best Regards, Artem B. Bityutskiy, St.-Petersburg, Russia.