UEFI & Ubuntu netinstall crashing

[Donofap]

Hi, I am trying boot RHEL 6 OS. My code is shown as below. It is giving exec format error with error 2e008081.

initrd http://x.x.x.x/cobbler/ks_mirror/RHEL6U6...initrd.img
chain http://x.x.x.x/cobbler/ks_mirror/RHEL6U6...ux/vmlinuz initrd=initrd.img ks=http://172.20.10.5/ks_mirror/RHEL6U6x64/rhel6u6x64.cfg network ksdevice=${netX/mac}
boot

Please let me know How can I proceed..