[syslinux] use it with different NFS server

[gogo]

Hi to all,
 I'm trying to install PXE boot + NFS for diskless boot for Linux system. So
everything looks fine until I tried to use other NFS server to mount root
file system.

So I try just to change parameter in pxelinux.cfg files 
Append nfsroot=to_new_nfs_server:/new_root_dir

But in boot process I received rootserver: TFTP/DHCP server rootpath:
<empty> 
                                                            Filename: right
one : and so on :.
So I read documentation for dhcpd3 server and set option to the client 
                           Root-path: to_new_nfs_server:/new_root_dir

And reboot the node again 
New result was: 
  
rootserver: TFTP/DHCP server rootpath:  to_new_nfs_server:/new_root_dir
                                                            Filename: right
one : and so on :.

So root server still remain unchangeable 

I tried to recreate with mkinitramfs again initrd.img with options NFSROOT =
 to_new_nfs_server:/new_root_dir
 But to result is still the same 

Systems for server and for node are Debian Etch 

So anybody know how to mount nfsroot from other nfs server ? 

Thanks in advance 
    Georgi