I followed instructions on booting my IMX28EVK board over TFTP/NFS from my Ubuntu 10.04 32 bit host... and it works ~50% of the time. TFTP boot takes 1-2 seconds to initialize, and mounting root FS over NFS fails about 30% of the time. Simply resetting the board would work sometimes. I tried connecting the board directly to my development host - same thing, so network should not be the issue.
When it fails, it says:
Root-NFS: Unable to get nfsd port number from server, using default
I made sure nfs-kernel-server and portmap are running OK. The puzzling part is that works sometimes, and then fails at other times. Any ideas?