vfat loopback mount problem

[Alaor Koppe]

I have mounted my jfss2 on NAND Flash and created my file.img (with
fat12 filesystem) and when I try to mount I get:

# mount -t msdos file.img fat -o loop,ro
FAT: bogus number of reserved sectors
VFS: Can't find a valid FAT filesystem on dev loop0.
mount: Mounting /mnt/file.img on /mnt/fat failed: Invalid argument

I don't know what is happening, anybody can help me?
(I am using a kit from Embedded Artists with LPC2468 and
uClinux-dist-20051014 with kernel 2.6.11)

Best Regards

-- 
Alaor Abel Koppe