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Chapter 4: BIOS
4-1
Chapter 4
BIOS
4-1 Introduction
This chapter describes the Phoenix BIOS™ Setup utility for the X6DH3-G2/X6DHi-
G2. The Phoenix ROM BIOS is stored in a fl ash chip and can be easily upgraded
using a fl oppy disk-based program.
Note: Due to periodic changes to the BIOS, some settings may have been added or
deleted and might not yet be recorded in this manual. Please refer to the Manual
Download area of the Supermicro web site <http://www.supermicro.com> for any
changes to the BIOS that may not be refl ected in this manual.
System BIOS
The BIOS is the Basic Input Output System used in all IBM
®
PC, XT™, AT
®
, and
PS/2
®
compatible computers. The Phoenix BIOS fl ash chip stores the system
parameters, types of disk drives, video displays, etc. in the CMOS. The CMOS
memory requires very little electrical power. When the computer is turned off, a
backup battery provides power to the BIOS fl ash chip, enabling it to retain system
parameters. Each time the computer is powered on, the computer is confi gured
with the values stored in the BIOS ROM by the system BIOS, which gains control
at boot-up.
How To Change the Confi guration Data
The CMOS information that determines the system parameters may be changed by
entering the BIOS Setup utility. This Setup utility can be accessed by pressing the
<Delete> key at the appropriate time during system boot. See below.
Starting the Setup Utility
Normally, the only visible POST (Power On Self Test) routine is the memory test. As
the memory is being tested, press the <Delete> key to enter the main menu of the
BIOS Setup utility. From the main menu, you can access the other setup screens,
such as the Security and Power menus. Beginning with Section 4-3, detailed de-
scriptions are given for each parameter setting in the Setup utility.
Warning: Do not shut down or reset the system while updating the BIOS
to prevent possible boot failure.