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CHAPTER 6: Troubleshooting
74
DIM code checkpoints
The Device Initialization Manager (DIM) gets control at various times during BIOS POST to initialize
different system buses. The following table describes the main checkpoints where the DIM module
is accessed.
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 types of checkpoints that may occur during ACPI
sleep or wake events:
BIOS
The settings in the BIOS Setup utility are not retained
• Replace the CMOS battery. For instructions, see “Replacing the CMOS battery” on page 49.
Checkpoint Description
2A Initialize different buses and perform the following functions:
■
Reset, Detect, and Disable (function 0) — Disables all
device nodes, PCI devices, and PnP ISA cards. It also
assigns PCI bus numbers.
■
Static Device Initialization (function 1) — Initializes all
static devices that include manual configured onboard
peripherals, memory and I/O decode windows in PCI-PCI
bridges, and noncompliant PCI devices. Static resources
are also reserved.
■
Boot Output Device Initialization (function 2) — Searches
for and initializes any PnP, PCI, or AGP video devices.
38 Initialize different buses and perform the following functions:
■
Boot Input Device INitialization (function 3) — Searches for
and configures PCI input devices and detects if system has
standard keyboard controller.
■
IPL Device Initialization (function 4) — Searches for and
configures all PnP and PCI boot devices.
■
General Device Initialization (function 5) — Configures all
onboard peripherals that are set to an automatic
configuration and configures all remaining PnP and PCI
devices.
Checkpoint Description
AC First ASL checkpoint. Indicates that 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.