I was wondering if anyone has been able to get pxe boot to work on raspi 3b+ aarch64?  I get some weird errors, "missing environment variable: bootfile" and "Bad Linux ARM64 Image magic!".   I have attached screen shot and following is default file in pxelinux.cfg folder:

default menu.c32
prompt 0
timeout 30
MENU TITLE TEST PXE Menu   
label Fedora-Minimal (4.18.16-300.fc29.aarch64)
kernel fedora/root/boot/vmlinuz-4.18.16-300.fc29.aarch64
append console=ttyS0,115200 ip=dhcp root=nfs:xxx.xxx.xxx.xx:/fedora/root selinux=0 rw
fdtdir fedora/root/boot/dtb-4.18.16-300.fc29.aarch64/
initrd fedora/root/boot/initramfs-4.18.16-300.fc29.aarch64.img

any pointers appreciated!