Legacy BIOS Boot Mode is enabled by default . Because all supported Linux operating systems support both Legacy BIOS and Unified Extensible Firmware Interface (UEFI), you have the option of setting the boot mode to either Legacy BIOS or UEFI before you perform the OS installation. Before you install a Linux operating system, you should ensure that UEFI settings are configured to support the type of installation you plan to perform.
For detailed instructions for switching the BIOS mode from UEFI to Legacy BIOS, or vice versa, see the Oracle X6 Series Servers Administration Guide at http://www.oracle.com/goto/x86admindiag/docs.
The following topics provide specific instructions on how to configure UEFI to support the installation:
For more information about changing boot properties, refer to the Oracle X6 Series Servers Administration Guide at http://www.oracle.com/goto/x86admindiag/docs.