-rootargs=setenv rootpath /tftp/$(ipaddr)
-nfsargs=setenv bootargs root=/dev/nfs rw nfsroot=$(nfsserverip):$(rootpath)
-addip=setenv bootargs $(bootargs) ip=$(ipaddr):$(nfsserverip):$(gatewayip):$(netmask):$(hostname):eth0:
+rootargs=setenv rootpath /tftp/${ipaddr}
+nfsargs=setenv bootargs root=/dev/nfs rw nfsroot=${nfsserverip}:${rootpath}
+addip=setenv bootargs ${bootargs} ip=${ipaddr}:${nfsserverip}:${gatewayip}:${netmask}:${hostname}:eth0: