Netbooting - Restricting Nic probing

[Michael Hearn]

Guys - Have trawled through the archives but can't track down any
similar issues - atleast reported against recent versions of  grub.
I'll try and be succinct.  
I'm netbooting Dell 1650's/2650's/2850's using dhcp/tftp/pxegrub - 
pxegrub is compiled with e1000 driver.
Each server has eth1 wired to the network that is served by DHCP/TFTP. 
Eth0  is served by a seperate subnet.

At boot time eth1 is succesfully assigned an IP and tftp downloads
pxegrub no problem.  However, once loaded pxegrub  probes and finds
eth0 (and any other nic that can be initialized by the driver). This
seems to inhibit pxegrub to download menu.lst to the correct nic of
eth1.   Subsequently the boot process hangs.

Is there a way to restrict the probing?

I did read a 3 year old note (bug 1760) indicating netboot/config.c
(0.92) could be edited but I suspect the fix does not apply to 0.95 or
0.96.

Any help, hints and tips would be very graciously received.
Mike.