The BIOS firmware supports both legacy boot mode and Unified Extensible Firmware Interface (UEFI) boot mode; the default setting is legacy boot mode. Some operating systems support both legacy BIOS and UEFI BIOS boot modes and some support legacy boot mode only.
The following Linux OS versions support UEFI boot mode:
Oracle Linux 6.x
RHEL 6.x
SLES 11.x
The following Linux OS versions do not support UEFI boot mode:
Oracle Linux 5.x
RHEL 5.x
SLES 10.x
These are the options for setting the BIOS boot mode before installing the OS:
If the OS supports legacy BIOS boot mode only, ensure that BIOS is set to legacy mode before you do the OS installation.
If the OS supports both legacy BIOS and UEFI BIOS boot modes, you have the option of setting BIOS to either legacy BIOS boot mode or UEFI BIOS boot mode before you perform the OS installation.
POST messages appear on the console.
The BIOS Setup Utility main screen appears.
The Boot Menu screen appears.
Next Steps