Acpi; System States And Power States; Reset Types; Power States And Targeted System Power - Intel NetStructure MPCBL0001 Technical Product Specification

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Intel NetStructure MPCBL0001 High Performance Single Board Computer
Contents
3.11

ACPI

ACPI gives the operating system direct control over the power management and Plug and Play
functions of a computer. The use of ACPI with theMPCBL0001 SBC requires an operating system
that provides ACPI support. ACPI features include:
•
Plug and Play (including bus and device enumeration) and APM support (normally contained
in the BIOS).
•
Power management control of individual devices, add-in boards (some PMC cards may
require an ACPI-aware driver), and hard-disk drives.
•
A soft-off feature that enables the operating system to power off the computer.
•
Support for an IPMC firmware command switch.
3.11.1

System States and Power States

Under ACPI, the operating system directs all system and device power state transitions. The
operating system puts devices in and out of low-power states based on user preferences and
knowledge of how devices are being used by applications. Devices that are not being used can be
turned off. The operating system uses information from applications and user settings to put the
system as a whole into a low-power state.
Table 23, "Power States and Targeted System Power" on page 58
associated system power targets supported by the MPCBL0001 SBC. See the ACPI Specification
for a complete description of the various system and power states.
3.12

Reset Types

Table 23.

Power States and Targeted System Power

Global States
G0 – working state
G1 – sleeping state
G2/S5
G3 – mechanical off
AC power is disconnected
from the computer.
The watchdog timer on the IPMC can be configured and used through standard IPMI v1.5
watchdog timer commands. Refer to
implementation.
58
Processor
Sleeping States
S0 – working C0 – working
S4 – Suspend to disk. No power
Context saved to disk.
S5 – Soft off. Context No power
not saved. Cold boot is
required.
No power to the system. No power
Section 3.13.1, "WDT #1" on page 64
lists the power states and the
Device States
States
D0 – working state.
D3 – no power except for wake
up logic.
D3 – no power except for wake
up logic.
D3 – no power for wake up
logic, except when provided by
battery or external source.
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Technical Product Specification
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