Intel SDS2 5.5 ACPI , 5.6 AC Link Mode

Intel® Server Board SDS2 Server Management

Revision 1.2

Order Number: A85874-002 33

uncorrectable errors. In addition, the HE-SL can generate BERR# on unrecoverable ECC errors

detected on the processor bus. Unrecoverable errors are routed to NMI by BIOS.

The HE-SL is programmed to generate an SMI on single-bit data errors in the memory array if

ECC memory is installed. The HE-SL performs the scrubbing. The SMI handler simply records the

error and the DIMM location to the System Event Log. Double-bit errors in the memory array are

mapped to SMI because the Sahalee BMC cannot determine the location of the bad DIMM.

The blue “ID LED”, located at the back edge of the Server Board near NIC2, is used to help locate

a given server platform requiring service when installed in a multi-system rack. The LED is lit when

the front panel ID button is pressed and is turned off when the button is pressed again.

5.5 ACPI

The Advance Configuration and Power Interface (ACPI)-aware operating system can place the

system into a state where the hard drive spin down, the system fans stop, and all processing is

halted. In this state, the power supply is still on and the processors still dissipate some power,

such that the power supply fan and processor fans continue to run.

Note: ACPI requires an operating system that supports this feature.

The sleep states discussed below are defined as:

• S0: Normal running state

• S1: Processor sleep state. No content is lost in this state and the processor caches

maintain coherency

• S4: Hibernate or Save to Disk. The memory and machine state are saved to disk.

Pressing the power button or another wakeup event restores the system state from disk

and resumes normal operation. This assumes that no hardware changes were made to

the system while it was off

• S5: Soft off. Only the RTC section of the chip set and the BMC are running in this state

The SDS2 Server Board supports sleep states s0, s1, s4, and s5. When the Server Board is

operating in ACPI mode, the operating system retains control of the system and the operating

system policy determines the entry methods and wake up sources for each sleep state. Sleep

entry and wake-up event capabilities are provided by the hardware but are enabled by the OS.

5.6 AC Link Mode

The AC link mode allows the system to monitor its AC input power so that if AC input power is lost

and then restored, the system returns to one of the following pre-selected settings:

• Power On

• Last State (Factory Default Setting)

• Stay Off