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Chapter 3
AMIBIOS Power-On Self Test
Overview
The AMIBIOS (Basic Input Output System) provides all IBM standard POST routines, as well as enhanced AMIBIOS POST routines. POST supports CPU
internal diagnostics. POST codes are accessible via the Manufacturing Test Port (I/O Port 80h).
POST Phases
When the system is powered on, the AMIBIOS runs Power-On Self Test (POST), which has two phases:
System Test and Initialization (test and initialize motherboards for normal operations) and
System Configuration Verification (compare defined configuration with hardware actually installed).
BIOS Error Reporting
The AMIBIOS performs the various diagnostic checks at the time the system is powered up; if an error is encountered, the error are reported in one of two ways:
If...
the error occurs before the
a series of beeps sound. Beep codes indicate that a
display device is initialized,
fatal error has occurred. The AMIBIOS Beep Codes are
described on the next page.
the error occurs after the display
the error message is displayed. Non-fatal BIOS error
device is initialized,
messages are explained below. A prompt to press <F1>
can also appear with non-fatal errors.
then...
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