Etherboot from Award BIOS 4.51

Hi

I have been trying to boot LTSP by flashing a bootrom into
the BIOS of some Pentium I's I have. 
I had success on the machines with AMI BIOS but not on the
machines with Award BIOS. 
The only differance is that in the AMI BIOS machines I can
choose the boot sequence in the BIOS setup to boot from
Network. In the Award BIOS machines with Award BIOS 4.51
there is no option for Network\Lan boot in the boot
sequence of the BIOS setup.
I have seen that on the machines with Award BIOS 6.0 there
is the option for Network boot in the BIOS setup.

QUESTION: 
How can I get the machines with the Award BIOS 4.51 to know
that it must use the bootrom file I flashed into the BIOS
for booting.

Nico


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