"mount --bind" with rootfs

[John Frankish]

As per Chapter 6.2.2 of SVN-20090401 where the host (tinycorelinux) runs entirely in ram I get this:

# mount --bind /dev /mnt/sdc1/dev
mount: wrong fs type, bad option, bad superblock on /dev,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail  or so

I understand this is something to do with rootfs (the ,dev option is set for sdc1), but cannot find how to get around it - I'd be grateful for any suggestions

Thanks, John