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Chapter 4
DIM Code Checkpoints
ACPI Runtime Checkpoints
AC
End of POST initialization of chipset registers.
B1
Save system context for ACPI.
00
Passes control to OS Loader (typically INT19h).
61-70
OEM POST Error. This range is reserved for chipset vendors & system manufacturers. The
error associated with this value may be different from one platform to the next.
Checkpoint
Description
2A
Initialize different buses and perform the following functions: Reset, Detect, and Disable
(function 0); Static Device Initialization (function 1); Boot Output Device Initialization
(function 2). Function 0 disables all device nodes, PCI devices, and PnP ISA cards. It also
assigns PCI bus numbers. 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. 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); IPL Device Initialization (function 4); General Device Initialization (function 5).
Function 3 searches for and configures PCI input devices and detects if system has
standard keyboard controller. Function 4 searches for and configures all PnP and PCI boot
devices. 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 check 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
Checkpoint
Description
