The errors is because the modules were not created for kernel 2.6.30-rc6. If you are using a kernel with modules, install the modules and you should have a /lib/modules/2.6.30-rc6 directory. If the kernel has no modules, just do a 'depmod -a' as root and it should fix the error messages.
Can you post your u-boot configuration? Looks like the rootfstype is missing or you are using the wrong partition. Try adding "rootfstype=jffs2" to the boot parameters.
Thanks for the information. Is there any git repository or patch file against the mainstream u-boot git? Something like we have for kernel on git.marvell.com would be nice.