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While control is in the different functions, additional checkpoints are output to port 80h as a word
value to identify the routines under execution. The low byte value indicates the main POST Code
Checkpoint. The high byte is divided into two nibbles and contains two fields. The details of the high
byte of these checkpoints are as follows:
HIGH BYTE XY
The upper nibble 'X' indicates the function number that is being executed. 'X' can be from 0 to 7.
0 = func#0 disable all devices on the BUS concerned
1 = func#1 static devices initialization on the BUS concerned
2 = func#2 output device initialization on the BUS concerned
3 = func#3 input device initialization on the BUS concerned.
4 = func#4 IPL device initialization on the BUS concerned
5 = func#5 general device initialization on the BUS concerned
6 = func#6 error reporting for the BUS concerned
7 = func#7 add-on ROM initialization for all BUSes
8 = func#8 BBS ROM initialization for all BUSes
The lower nibble 'Y' indicates the BUS on which the different routines are being executed. 'Y' can be
from 0 to 5.
0 = Generic DIM (Device Initialization Manager)
1 = On-board System devices
2 = ISA devices
3 = EISA devices
4 = ISA PnP devices
5 = PCI devices
Table B-5 ACPI Runtime Checkpoints
ACPI checkpoints are displayed when an ACPI capable operating system either enters or leaves a
sleep state. The following table describes the type of checkpoints that may occur during ACPI sleep
or wake events:
Checkpoint Code Description
AC First ASL checks point. Indicates the system is running in ACPI mode.
AA System is running in APIC mode.
01, 02, 03, 04, 05 Entering sleep state S1, S2, S3, S4, or S5.
10, 20, 30, 40, 50 Waking from sleep state S1, S2, S3, S4, or S5.
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