Howto build iPXE for 3Com 3c515-TX?

[ConiKost]

Hi!
I've an pretty old 3Com 3c515-TX ISA Card. As the original 3com bootrom does not support any pxe, I would like to build iPXE for that.

But I a little bit confused. According to the source code, it seems to be supported. But how do I build a *.rom-file? The docs says, that I need a device and vendor id. But this only applies to pci, not isa? So what do I do, in order to build a rom?

I want to flash that rom with my chip burner.

Thanks!