Trenton NTM6900, Техническое описание

Страница: 53 / 158

NTM6900 / WTM7026 Technical Reference Motherboard Installation
Chapter 4 System BIOS
BIOS Operation
Chapters 3 through 8 of this manual describe the operation of the American Megatrends AMIBIOS and the
BIOS Setup Utility. Refer to
Running AMIBIOS Setup
later in this chapter for standard Setup screens,
options and defaults. The available Setup screens, options and defaults may vary if you have a custom
BIOS.
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 (POSTs) which are performed when the system 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
AMIBIOS checks system memory and reports it 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 and if it 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 a bootable device, such as a
hard disk. Boot order may be specified by the
Boot Device Priority
option on the Boot Setup Menu as
described in the
Boot Setup
chapter later in this manual.
4-1 TRENTON Technology Inc.