Problem with initrd not creating /dev/ram0

Hi guys, I have a hair-tearing problem here and I hope some one is able to help me. I have built linux 2.6.39.4. Unfortunately, for some reason I don't get /dev/ram0 but /dev/root:

Filesystem 1K-blocks Used Available Use% Mounted on /dev/root 2726 2169 415

84% / /dev/mtdblock1 14080 644 13436 5% /mnt/flash

I've commented out /dev/root in fstab (it seems to be ignored), changed it to /dev/ram0 but it still doesn't appear!

An older rootfs built for linux 2.6.22.1 but booted with 2.6.39.4 gives me:

Filesystem Size Used Available Use% Mounted on /dev/ram0 3.6M 1.2M 2.4M 32% / /dv/mtdblock1 13.6M 644.0k 13.1M 5% /mnt/ flash

When I use the *same* fstab, inittab, basically identical etc directory from 2.6.22.1 in the new 2.6.39.4 rootfs, I don't see /dev/ ram0.

What do I need to enable in buildroot linux-menuconfig for 2.6.39.4 to get it to be able to create the same filesystem as linux 2.6.22.1.

Any help appreciated.

Thanks!