My custom kernel cannot locate the reiserfs superblock.

Hi, I have built several new kernels using the Linus 2.6 tree. The kernel boots to the point of trying to mount the "/" reiserfs partition and then fails to locate the superblock. Any ideas why this is happening? The OpenSUSE kernels work fine. Is there any non-standard tweaking to the reiserfs support in OpenSUSE kernels? Thanks, Miles