A big thank you goes out to Blue Thunder Somogyi for this contribution.
Currently UCS Director does not support UEFI PXE boot for bare metal provisioning. Recent inclusion of native 4K drives in some UCS configurations requires UEFI boot mode. If RHEL or CentOS UEFI installation is required, this approach will make UEFI PXE provisioning of Linux possible.
This has been tested with RHEL/CentOS 6.5 only.
Please see attached word document.