how to embed simple script to ipxe.efi

[chainloadee]

Hello,
My setup is chainboot with legacy undionly.kpxe with an embedded script with legacy bios settings.
Script:
#!ipxe
dhcp
chain http://chainboot.mydomain.com

lt works fine, but now I need uefi. It boots ok, but loops, so I tried to embedd this bootscript with

make /bin/ipxe.efi EMBED=script.ipxe

but it only says nothing to do. I found a second Makefile.efi, but I don't know how to use it.

Am I doing right or is there another way with UEFI boot to embed a script.

all the best