Net-booting an EFI image on an aarch64 server with iPXE script

[NiKiZe]

you are starting iPXE on ARM correct? Are you from there starting an ARM kernel?

you will also have to load the proper initrd, and make sure that if the file is initrd.gz, the kernel commandline needs to have initrd=initrd.gz - since that is how it knows which file to load.
Don't try to use grub or anything else, unless you know for sure you have to.
All of this can, and should be done directly from iPXE.

Just use the proper kernel and initrd lines and you would be fine.