How to made modern PCI NIC with PROM socket bootable?

Hello pxes-devel,

Few years ago I made bootable 10Mb network cards from NE2000 ones (ISA and PCI buses).
I used special DOS setup utility which could set ioport, irq, size [EE]PROM and special
option 'Boot From PROM' (or something like this - don't remember exactly).
I took boot image from 'rom-o-matic', burnt it, nested PROM in socket on netcards
and was happy to download image from tftp server using 'bootp' protocol.

Now I have widespread 100Mb PCI NICs on 'rtl8139' chipset. System doesn't want to boot 
from NIC. There is no BIOS option 'Boot from NIC' on old motherboards. There is no
special utility for such network cards. What should I do to make it bootable? 
Please, don't offer me to boot initial loader for netcard from floppy.

Thanks in advance,

Vladimir




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