I'm attempting to get a YAFFS2 filesystem to work on a NAND that I am simulating in QEMU using the NAND simulator code in the mainline kernel.<br><br>I can mount my simulated NAND device (via its MTD block device) without any errors ($ mount -t yaffs2 /dev/mtdblock0 /mnt/yfs).&nbsp; I can create files and everything seems to be working well.&nbsp; I can put debugging printk()s in the source for 
nandsim.c and see that the write and read functions are in fact getting called and returning successfully.&nbsp; I also have MTD debugging tunred on (level 3) and its output seems to looks okay to me.&nbsp; Everything seems fine.<br>
<br>However, when I unmount the filesystem and then mount it again, nothing resides in the filesystem except lost+found.<br><br>This happens both when I:<br>&nbsp; 1.) Mount the filesystem without doing any kind of formatting to the partition (simulated NAND) before mounting it, unmount, and then remount
<br>&nbsp; 2.) When I run mkyaffs2 (modified version of mkyaffs for LP NANDs) with no image to write and then mount the filesystem, umount, and remount<br><br>I am not shutting down the QEMU emulator between mounts, because everything would obviously go away then (simulated NAND is in RAM).
<br><br>Has anyone experienced this before and/or would be willing to offer suggestions?<br><br>Thanks in advance,<br><br>Ross S.<br>