Manual Number: 40110-005-2
Page 35
Chapter 3: BIOS Operation
Sections 3 through 7 of this manual describe the operation of the American Megatrends Hi-Flex
AMIBIOS and the AMIBIOS Setup Utility. Refer to Running AMIBIOS Setup later in this section
for standard Setup screens, options and defaults.
When the system is powered on, AMIBIOS performs the Power-On Self Test (POST) routines.
These routines are divided into two phases:
1. System Test and Initialization. Test and initialize system boards for normal operations.
2. System Configuration Verification. Compare defined configuration with hardware actually
installed.
If an error is encountered during the diagnostic tests, the error is reported in one of two different
ways. If the error occurs before the display device is initialized, a series of beeps is transmitted. If
the error occurs after the display device is initialized, the error message is displayed on the screen.
See BIOS Errors later in this section for more information on error handling.
The following are some of the Power-On Self Tests (POST’s) which are performed when the sys-
tem is powered on:
•
CMOS Checksum Calculation
•
Keyboard Controller Test
•
CMOS Shutdown Register Test
•
8254 Timer Test
•
Memory Refresh Test
•
Display Memory Read/Write Test
•
Display Type Verification
•
Entering Protected Mode
•
Memory Size Calculation
•
Conventional and Extended Memory Test DMA Controller Tests
•
Keyboard Test
•
System Configuration Verification and Setup
Note: When you perform a warm boot by pressing <Ctrl><Alt><Del>all memory tests are by-
passed.
AMIBIOS checks all system and cache memory and reports them on both the initial AMIBIOS
screen and the AMIBIOS System Configuration screen which appears after POST is completed.
AMIBIOS attempts to initialize the peripheral devices by verifying the validity of the system setup
information stored in the system CMOS RAM. (See the Running AMIBIOS Setup section of this
manual.) If AMIBIOS detects a fault, the screen displays the error condition(s) which has/have
been detected. If no errors are detected, AMIBIOS attempts to load the system from any bootable
device, such as a floppy disk or hard disk.
Summary of Contents for SB686P Series
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