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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:
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.
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