Setting Up BIOS Configuration Parameters 167
Using Legacy or UEFI BIOS
The BIOS firmware controls the system from power-on until an operating system is
booted. The BIOS is based on the Unified Extensible Firmware Interface (UEFI)
specification. However, the BIOS supports booting from both Legacy BIOS and UEFI
BIOS, depending on which operating system you are using.
This section includes the following information:
■ “Selecting Legacy BIOS or UEFI BIOS Boot Mode” on page 167
■ “Switching Between Legacy BIOS and UEFI BIOS” on page 168
■ “UEFI BIOS Boot Mode Advantages” on page 169
■ “Configuration Utilities for Add-In Cards” on page 169
Selecting Legacy BIOS or UEFI BIOS Boot Mode
BIOS supports two boot modes: Legacy BIOS and UEFI BIOS. You can set the UEFI
BIOS Boot Mode using the Boot Menu in the BIOS Setup Utility. UEFI BIOS Boot
Mode selection depends on the operating system type and configuration that is
installed in the system. Some devices and operating systems do not yet support UEFI
BIOS and can only boot in Legacy BIOS Boot Mode. Depending on your situation,
you might have to specify which boot mode of BIOS you want to use, Legacy BIOS
Boot Mode or UEFI BIOS Boot Mode.
Choose Legacy BIOS Boot Mode to allow host bus adapters (HBAs) to use Option
ROMs. Choose UEFI BIOS Boot Mode to use UEFI drivers.
When using operating systems that support booting only from Legacy BIOS, the
Legacy BIOS Boot Mode must be used. When using operating systems that support
booting from Legacy BIOS or UEFI BIOS, either mode can be used. However, once a
mode is chosen and an operating system is installed, the operating system can only
be booted using the same mode that was used for the installation.
The following operating systems do not support UEFI BIOS:
■ Oracle Solaris 10
■ Oracle Linux 5.x
■ Red Hat Enterprise Linux 5.x
■ Oracle VM 3.2
For updates to this list, refer to the Sun Server X4-2 Product Notes at:
http://www.oracle.com/goto/X4-2/docs
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