The Oracle Server X5-8 is equipped with a Unified Extensible Firmware Interface-compatible BIOS (UEFI BIOS), which avoids many of the limitations of the legacy BIOS. However some operating systems cannot boot in UEFI boot mode, so the UEFI BIOS provides the ability to select between UEFI and legacy boot modes. The default is legacy 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 Save Changes and Reset command.
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 your Oracle Integrated Lights Out Manager (ILOM) documentation at: http://www.oracle.com/goto/ILOM/docs.
Once you choose a boot mode and install an operating system, if you reboot the server and select a different boot mode, the installed image is not accessible and cannot be used.
The table below describes the BIOS boot modes.
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For more details on UEFI BIOS, see the Oracle x86 Administration Guide for X5 Series Servers at: http://www.oracle.com/goto/x86AdminDiag/docs