Remember, you probably still need something to emulate the mtd device unles mount -o jffs2 /dev/mmcetc works straight.

mtdram is out. johnx with 1gb ram couldn't mount diablo initfs, i could with 2gb ram.
mtd2block sounds like it would work.

fanoush posted me a bug which made his partition start location later but he had to compile custom kernel to point to new place and never fixed it afaik