Advanced Configuration and Power Interface Specification

Waking and Sleeping
on what the hardware platform supports. This section describes at a high level what should be done
for these different options. Figure 16-77 illustrates the flow of the boot-up software.
Boot Vector
SLP_TYP=S2
?
Yes
No
Initialize CPU
Init Memory Controller
Enable Memory
Configure Caches
Enable Caches
Initialize Chipset
Initialize CPU
Enable Memory
Configure Caches
SLP_TYP=S3
?
Yes
No
SLP_TYP=
S4BIOS
?
Yes
Restore memory
Image
No
POST
Jump To
Waking Vector
Initialize Memory
Image
* System
* Reserved
* ACPI NVS
* ACPI Reclaim
* ACPI Tables
* MPS Tables
* ...
Boot OS Loader
Figure 16-77 BIOS Initialization
The processor will start executing at its power-on reset vector when waking from an S2, S3, or S4
sleeping state, during a power-on sequence, or as a result of a hard or soft reset.
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