/etc/cobbler/pxe/gpxe_system_freebsd.template is in cobbler-common 2.4.1-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!gpxe
kernel http://$server/cobbler/ks_mirror/$distro/boot/memdisk
imgargs memdisk raw iso
initrd http://$server/cobbler/ks_mirror/$distro/boot/bootonly.iso.zip
boot
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