WDS , Server 2012 R2 and eUFI boot

Hi,

Setup WDS on Server 2012 R2 , PXE boot is working if I disable secure boot and enable legacy boot.

PXE boot working only in legacy mode, and if I install the OS anyways in legacy mode, then enable the Secure boot, machine not able to boot (because uefi support was disabled)any thoughts why?

N.A.Malik