Need to support as many devices as possible!

[NiKiZe]

If you use the native nic/bios PXE stack to chain undionly.kpxe then it is totally up to that nic/bios rom to do the right thing. The linked post is rather about running ipxe.usb which uses the drivers in ipxe, and does not use the bios firmware at all.

If you have the same behavior as the poster with undionly.kpxe just hangs then you have a firmware bug. Sometimes it works with undionly.kkpxe in those cases (note the double k) however that leaves a couple of leaks and should not be used in normal operations.