Network boot servers (PXE) based on Oracle Linux 6.1 or Red Hat Enterprise Linux 6.1 or 6.2 cause UEFI Linux clients to panic when booting over the network. The grub.efi bootloader included with the software distribution does not work with Unified Extensible Firmware Interface (UEFI) clients.
Oracle Linux 6.1
Red Hat Enterprise Linux (RHEL) 6.1 and 6.2
Releases 1.0 through 2.0.1
To support UEFI network boot clients, update the Oracle 6.1 distribution grub.efi bootloader package on your PXE boot server. You can obtain updates from Unbreakable Linux Network (ULN) at: https://linux.oracle.com