a question about ipxe boot for imac a1419

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Hi Everyone,

This is my first post here on the forums, so let me just say thanks for providing this great software for free

I have an imac a1419,but is not have pxe boot rom,so i think to ipxe boot

I have to download ipxe.iso form http://boot.ipxe.org/ipxe.iso to save my usb disk

turn on my computer and boot form the usb disk

the computer indicates the following

isolinux 3.75 2009-04-16 etcd copyright © 1994-2009 h.....
ipe iso boot image
loading ipxe.krn..........ready
ipxe initialising devices ....ok

ipxe 1.0.0+ ---open source nework boot firmware --
features: http issi dns tftp aoe srp bzimage elf mboot pxe pext menu

no more network devices


the message if can't find the computer network card

so i using the same method on another computer (the computer integration a rtl8169 network card)

this ipxe boot is ok.

so i think in this ipxe.iso, no have imac a1419 network card drviers. imac a1419 integration a broadcom network card

so i want to ask you a question,how to add a new nic card drivers in to the ipxe.iso

i have to compile the source code,but i don't know the new nic card drivers should be placed where,and how to modify

the source code

who can teach me? thank you