Getting RPI4 to iPXE boot from Netboot

[nodje]

Am I correct thinking that a RPI4 should be able to boot Netbootxyz iPXE menu upon receiving netboot.xyz-rpi4-snp.efi ?

As far as I can tell, my DHCP setup works fine, it's as simple as specifying next-server pointing to a tftp server containing netboot.xyz-rpi4-snp.efi and netboot.xyz.efi and the boot-file pointing to one or the other.

At any rate everything works smoothly when testing a VM iPXE boot with netboot.xyz.efi.
But a RPI4 would loop like this:

Netboot: <mac address> wait for link TFTP 0.0.0.0
Link ready
DHCP src: <mac address>> <ip addr for router>
YI_ADDR: <rpi-4 ip>
SI_ADDR:  <router-ip>