Note - Currently Oracle Linux 6.3, 6.4, and 6.5, Red Hat Enterprise Linux 6.4 and 6.5, and SUSE Linux Enterprise Server 11 are the only supported Linux operating systems that support UEFI BIOS.
The BIOS firmware supports both Legacy BIOS and Unified Extensible Firmware Interface (UEFI). The default setting is Legacy BIOS. Because some operating systems support both Legacy BIOS and UEFI BIOS and some support Legacy BIOS only, users have the following options:
If the operating system being installed supports Legacy BIOS only, you must make sure that BIOS is set to Legacy BIOS before you do the OS installation.
If the operating system being installed supports both Legacy BIOS and UEFI BIOS, you have the option of setting BIOS to either Legacy BIOS Boot Mode or UEFI BIOS Boot Mode before you perform the OS installation.
Note - After you have installed the operating system, if you decide you want to switch from Legacy BIOS to UEFI BIOS, or vice versa, you must remove all partitions and reinstall the operating system.
For example, to reset the server:
-> reset /System
The BIOS screen appears.
After a few moments, the BIOS Setup Utility appears.
The Boot Menu screen appears.