BeagleboardxM Rev[C] booting over NFS.linux-3.2.0

hello All !

i am trying to boot my kernel-3.2.0 with NFS, but after a lot of
efforts i m not being able to;
Folowing are the details, all i have,please help me why i cant have
NFS in my beagleboardxM RevC.

host side: Ubuntu10.10
     NFS: nfs-kernel-server
     DHCP: dhcp3-server
    /etc/exports/:/tftpboot *(rw,sync,no_root_squash)
    /etc/dhcp3/dhcpd.conf: ddns-update-style none;
         option domain-name-servers,,
         default-lease-time 600;
         max-lease-time 7200;
        subnet netmask {
        option routers;
        option subnet-mask;
        host anas {
            hardware ethernet 6c:f0:49:f3:b2:af;
            option host-name "anas";
            #filename "/tftpboot/uImage";

        log-facility local7;