Uefi Bios Overview; Boot Mode Selection; Legacy Bios Boot Mode - Sun Microsystems Server X4-2 Installation Manual

UEFI BIOS Overview

The Sun Server X4-2 contains a Unified Extensible Firmware Interface
(UEFI)-compatible BIOS that provides more boot options and configuration
capability for adapter cards than previous versions of the BIOS.
The server also supports a legacy version of the BIOS for use with software or
adapters that do not have UEFI drivers. The legacy version is the default.
The following sections provide more information on the UEFI BIOS modes:
"Boot Mode Selection" on page 28
■
"Legacy BIOS Boot Mode" on page 28
■
"UEFI BIOS Boot Mode" on page 29
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Refer to the Oracle X4 Series Servers Administration Guide at
http://www.oracle.com/goto/x86AdminDiag/docs
UEFI BIOS.

Boot Mode Selection

Two boot modes are available for BIOS: Legacy BIOS Boot Mode and UEFI BIOS Boot
Mode. UEFI BIOS can be configured to support either UEFI or Legacy BIOS Boot
Mode. However, some devices and operating systems do not yet support UEFI BIOS
and can boot only from Legacy BIOS Boot Mode.
If you change boot modes, the boot candidates from the previous mode disappear.
The boot candidates from the new mode appear after you issue the BIOS command
Save Changes and Reset. Use the Oracle ILOM BIOS Backup and Restore function to
preserve the configuration in case you want to switch back. For information about
Oracle ILOM, refer to the Oracle Integrated Lights Out Manager (ILOM) 3.1
Documentation Collection at: http://www.oracle.com/goto/ILOM/docs.

Legacy BIOS Boot Mode

Choose Legacy BIOS Boot Mode to allow host bus adapters (HBAs) to use option
ROMs. Select Legacy BIOS Boot Mode when software or adapters do not have UEFI
drivers, or the system is using option ROM. Legacy BIOS Boot Mode is the default
boot mode.
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.
28 Sun Server X4-2 Installation Guide • February 2014
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