What versions of Red Hat Enterprise Linux support booting via UEFI?

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Issue

What versions of Red Hat Enterprise Linux support booting via UEFI?
When attempting to boot RHEL 5 via UEFI, it hangs loading the initrd.img
"Boot Failed. Hard Disk 0" on IBM X servers with RHEL 5

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7

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