Could you post a tar image of the internal rootfs image? The one that is on /dev/mtdblock2 (at least, on the 3100's it's there). /dev/root should be a symlink to /dev/mtdblock2.
To get just the internal rom image, without grabbing everything else that's mounted under it, you can do the following:
# Mount a read-only copy of /dev/mtdblock2 somewhere
mkdir /mnt/tempmount
mount -oro /dev/mtdblock2 /mnt/tempmount
# tar up the image
tar -cf /hdd3/sl-c3200-root.tar
gzip /hdd3/sl-c3200-root.tar
# cleanup
umount /mnt/tempmount
rmdir /mnt/tempmount
This way, it will have everything but the kernel.