Switching Between Legacy Bios And Uefi Bios - Sun Oracle Sun Server X4-2 Service Manual

Only devices that support the selected mode are listed on the BIOS Boot screen. If
you select UEFI BIOS Boot Mode, only boot candidates that support UEFI BIOS are
listed in the Boot Options Priority list. If you select Legacy BIOS Boot Mode, only
boot candidates that support Legacy BIOS are listed in the Boot Options Priority list.
Related Information
"Switching Between Legacy BIOS and UEFI BIOS" on page 168
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"UEFI BIOS Boot Mode Advantages" on page 169
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"Configuration Utilities for Add-In Cards" on page 169
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Switching Between Legacy BIOS and UEFI BIOS

When switching between Legacy BIOS Boot Mode and UEFI BIOS Boot Mode (either
direction), BIOS settings that affect the Boot Options Priority list settings will be
changed. If the boot mode is changed, the boot candidates from the previous boot
mode disappear. The boot candidates for the newly changed boot mode appear after
you save your changes and reset the host and in the next boot to the BIOS Setup
Utility.
Note – When switching between Legacy BIOS Boot Mode and UEFI BIOS Boot
mode, Boot Options Priority list settings will not be preserved. Typically, once a boot
mode is selected, there is no need to switch boot modes. However, there is one
notable exception: the Pc-Check utility must be run in Legacy BIOS Boot Mode. If
boot settings are customized while in UEFI BIOS Boot Mode, and you need to run
diagnostics, you should use the BIOS Backup and Restore feature to capture the
customized settings prior to switching the boot mode to Legacy BIOS Boot Mode to
run diagnostics. When you return to UEFI BIOS Boot Mode, you can use the Oracle
ILOM Backup and Restore feature to reinstate your saved settings.
Because the settings for a given boot mode do not persist after a transition between
modes, you should use the BIOS Backup and Restore feature to capture and preserve
the BIOS configuration if you intend to switch back to the previous boot mode and
want to retain your previous BIOS settings. For information about the BIOS Backup
and Restore feature, refer to the Oracle Integrated Lights Out Manager (ILOM) 3.1
Documentation Library at http://www.oracle.com/goto/ILOM/docs.
Related Information
"Selecting Legacy BIOS or UEFI BIOS Boot Mode" on page 167
■
"UEFI BIOS Boot Mode Advantages" on page 169
■
"Configuration Utilities for Add-In Cards" on page 169
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168 Sun Server X4-2 Service Manual • May 2014