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35coreos-live: support coreos.live.rootfs_url=tftp://
As discussed in coreos/fedora-coreos-tracker#1055, the rootfs_url karg is preferred over initrd concatenation due to its lower memory footprint and generally better performance. We originally chose to disallow its use with TFTP to reduce the feature matrix, but that forces users without HTTP servers to fall back to concatenation. Enable TFTP so rootfs_url can be used in all environments.