linux-image 2.6.15 initrd cramfs mount problem

["nom de guerre" <ndg.disc@gmail.com>]

hello,

i was trying to mount  /boot/initrd.img-2.6.15-1-686 but i couldn't.
the command:

sudo mount -t autofs -o loop /boot/initrd.img-2.6.15-1-686 ~/tmp/ki/

in contrast:

sudo mount -t autofs -o loop /boot/initrd.img-2.6.12-1-686 ~/tmp/ki/

works! what is the problem? did the fs change? i greped the changelog
for cramfs and nothing was found.. any ideas?

thanks,
stymek.