Hello.
We are trying to get SCCM setup in our environment. We currently use a stand-alone WDS server, and using legacy boot options a client will successfully connect and pull an image. Our newest computers are UEFI only, however, and they will not connect to that same server.
It seems like this is a server issue, not a network issue as someone else here manages a K1000 server, and that server can handle both legacy *and* UEFI based clients simply by creating a new boot partition on the server itself. No network changes needed.
That makes me think that the network support for both legacy and UEFI are the same, and it's a server configuration issue.