I followed this https://community.freescale.com/docs/DOC-103717 and got the kernel running.
However, I cannot mount the /nfsroot to the wandboard. I have post my question on StackOverFlow http://stackoverflow.com/questions/34734092/nfs-rootfs-for-wandboard?noredirect=1#comment57436259_34734092
I am using Yocto Jethro Branch, Kernel 3.14.28
Do you know how to check whether the Kernel is NFS compatible?
How do mount the NFS Rootfs?