Intel MPCBL0001 manual Acpi, Reset Types, System States and Power States

Intel NetStructure® MPCBL0001 High Performance Single Board Computer

Contents

3.11ACPI

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.

3.11.1System 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 lists the power states and the associated system power targets supported by the MPCBL0001 SBC. See the ACPI Specification for a complete description of the various system and power states.

3.12Reset Types

Table 23.	Power States and Targeted System Power
	Global States	Sleeping States	Processor	Device States
			States
	G0 – working state	S0 – working	C0 – working	D0 – working state.
	G1 – sleeping state	S4 – Suspend to disk.	No power	D3 – no power except for wake
		Context saved to disk.		up logic.
	G2/S5	S5 – Soft off. Context	No power	D3 – no power except for wake
		not saved. Cold boot is		up logic.
		required.
	G3 – mechanical off	No power to the system.	No power	D3 – no power for wake up
	AC power is disconnected			logic, except when provided by
				battery or external source.
	from the computer.

The watchdog timer on the IPMC can be configured and used through standard IPMI v1.5 watchdog timer commands. Refer to Section 3.13.1, “WDT #1” on page 64 for detailed implementation.

58	Technical Product Specification
	Order #273817