Legacy BIOS Boot Mode and UEFI Boot Mode
When to Select Legacy or UEFI BIOS Boot Mode
When the option is available to choose between Legacy BIOS Boot Mode or UEFI Boot Mode,
the advantages of UEFI Boot Mode include:
■
Boots faster.
■
Avoids legacy option ROM address constraints. For more information, see
Boot Mode Considerations” on page 197
■
Supports operating system boot partitions greater than 2 terabytes (2 TB). For more
information about limitations for supported operating systems, refer to your server product
notes.
■
Integrates PCIe device configuration utilities with BIOS Setup Utility menus.
■
Displays bootable operating system images in the boot list as labeled entities. For example,
it displays Windows boot manager labels instead of raw device labels.
■
Provides efficient power and system management.
■
Includes robust reliability and fault management.
■
Uses UEFI drivers.
Choose Legacy BIOS Boot Mode:
■
If your operating system does not support booting in UEFI Boot Mode
■
To allow HBAs and Express Module devices to use option ROM
Other BIOS Boot Mode Considerations
Choosing Legacy BIOS Boot Mode allows HBAs and Express Module devices to use option
ROMs. Choosing UEFI Boot Mode uses UEFI drivers.
Note -
The operating system can only boot with the boot mode property value that was initially
set at installation. If you change the boot mode property value after installing the operating
system, the operating system will become inoperable (will not boot). To resolve this issue, you
must change the boot mode property value back to its initial setting.
Only devices that support the selected boot mode are listed on the BIOS Boot screen. If you
select UEFI Boot Mode, only boot candidates that support UEFI BIOS Boot Mode are listed
on the BIOS Setup Utility screens in the boot order list. If you select Legacy BIOS Boot Mode,
only boot candidates that support Legacy BIOS Boot Mode are listed in the boot order list.
Setting Up and Configuring BIOS
197
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