[Yaffs] One more dumb question

I've finally sifted through my config issues and now have a working P2
NAND driver. I'm trying to get yaffs to work 2.6.11 kernel. When I try
to mount a file system I get

/ # mount -t yaffs2 /dev/mtdblock/4 /tmp/p4
yaffs: dev is 32505860 name is "(unavailable)"
yaffs_read_super: Using yaffs2
yaffs_read_super: MTD block size 4096
yaffs: yaffs_GutsInitialise()
yaffs: NAND geometry problems: chunk size 1, type is yaffs
yaffs_read_super: guts initialised FAILED
mount: permission denied. (are you root?)


I am able to mount jffs2 file systems on the same partition.

Before I dive into this, is there something obvious I'm doing wrong?

Thanks,

Marty