Oracle Sun Server X4-4 Installation Manual page 25

Note that If you change boot modes, any boot candidates (such as disk drives)
Note -
configured when the server was in the previous mode will no longer be available. The only way
to make them available is to either go back to the previous boot mode or to reconfigure them
while in the new boot mode (which would wipe out any data on them).
Before changing boot modes, use the Oracle ILOM BIOS Backup and Restore function to
preserve the previous configuration in case you want to switch back.
Boot Mode
Legacy BIOS Boot Mode
UEFI BIOS Boot Mode
Description
Legacy BIOS Boot Mode is the default setting in the BIOS Setup Utility.
Choose Legacy BIOS Boot Mode to allow host bus adapters (HBAs) to use
adapter option ROMs. Select Legacy BIOS Boot Mode when software or
adapters do not have UEFI drivers, or the system is using option ROM.
In Legacy BIOS Boot Mode, only boot candidates that support Legacy BIOS
Boot Mode appear in the BIOS Setup Utility screens in the Boot Options
Priority list.
Note - Once you choose a boot mode and install an operating system, if you
reboot the server and select a different boot mode in BIOS, the OS will no
longer be accessible and cannot be used. You will need to switch back to the
previous boot mode setting to boot the OS.
Choose UEFI BIOS Boot Mode from the BIOS Setup Utility to use UEFI
drivers when software and adapters have UEFI drivers. For instructions for
making the selection, refer to the
Guide (http://www.oracle.com/goto/x86AdminDiag/docs).
In UEFI BIOS Boot Mode, only boot candidates that support UEFI BIOS
Boot Mode appear on the BIOS Setup Utility screens in the Boot Options
Priority list.
Currently, the following operating systems supported for the Sun Server
X4-4 support UEFI BIOS Boot Mode:
■ Oracle Solaris 11.1 and later
■ Oracle Linux 6.5
■ Red Hat Enterprise Linux 6.5
■ SUSE Linux Enterprise Server 11 SP3
■ Microsoft Windows Server 2008 R2 SP1 and Microsoft Windows Server
2012
All other operating systems (including factory preinstalled OS images) must
use Legacy BIOS Boot Mode.
For an up-to-date list, refer to the Sun Server X4-4 Product Notes at
www.oracle.com/goto/x4-4/docs.
Note - Once you choose a boot mode and install an operating system, if you
reboot the server and select a different boot mode in BIOS, the OS will no
Managing Your Server
Oracle X4 Series Servers Administration
Server Features and Components
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