Using the System Setup Program and UEFI Boot Manager 57Using the System Setup Programand UEFI Boot ManagerRun the System Setup program to familiarize yourself with your systemconfiguration and to:• Change the NVRAM settings after you add or remove hardware• Set or change user-selectable options• Enable or disable integrated devicesChoosing the System Boot ModeThe System Setup program also enables you to specify the boot modefor installing your operating system:• BIOS boot mode (the default) is the standard BIOS-level boot interface.• Unified Extensible Firmware Interface (UEFI) boot mode is an enhanced64-bit boot interface based on UEFI specifications that overlay the systemBIOS. See "Entering the UEFI Boot Manager" on page 69 for moreinformation on this interface.You select the boot mode in the Boot Mode field of the System Setupprogram. Once you specify the boot mode, the system boots in the specifiedboot mode and you then proceed to install your operating system from thatmode. Thereafter, you must boot the system to the same boot mode (BIOS orUEFI) to access the installed operating system. Trying to boot the operatingsystem from the other boot mode will cause the system to halt immediately atstartup.NOTE: Operating systems must be UEFI-compatible (for example,Microsoft® Windows Server® 2008 x64 version) to be installed from the UEFI bootmode. DOS and 32-bit operating systems do not support UEFI and can only beinstalled from the BIOS boot mode.
