[gPXE] Nature of EFI aspect of gPXE?

[Jarrod Johnson]

So in classic BIOS, something like gPXE gets to be the driver, the protocol
stack, and a boot loader.

My impression was that in UEFI, the drivers for networking are distinct from
the protocol stack.

Is there some document that clarifies what gPXE does in UEFI?  Does it help
port drivers to be UEFI drivers, or does it do something fancier?  In BIOS
world, I build an undionly.kkpxe to give me better protocol support without
replacing the firmware, does that use case map to uefi or am I currently
stuck with tftp without elilo/grub2 patches?
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