I wanted to hack the m0n0wall cdrom version. I am trying to mount the rootfs by:

mount /dev/vn0 /mnt/cdimage 

and I get 

mount: /dev/vn0 on /mnt/cdimage: incorrect super block

Ive done some searching but nothing I found helps. Are there any ideas
out there. Also has anyone else out there done this with the cd
version, and if so could you please post your steps so I can check
them against mine?

Thanks 

Curt