Power Control Sources; Bmc Watchdog; Table 14. Power Control Initiators - Intel S1200SPL Technical Spesification

Intel® Server Board S1200SP Family Technical Product Specification

6.4 Power Control Sources

The server board supports several power control sources which can initiate a power-up or power-down
activity.
Source
Power button
BMC watchdog timer
Command
Power state retention
Chipset
CPU Thermal
WOL(Wake On LAN)
PCH Thermal
Fan and Temperature
Power Supply
* Not applicable to all products. Applies only to Multi-Node products.
** Not applicable to all products. Applies only to Node3 and Node4 on Multi-Node products when the Shutdown policy feature is
enabled.

6.5 BMC Watchdog

The BMC FW is increasingly called upon to perform system functions that are time-critical in that failure to
provide these functions in a timely manner can result in system or component damage. Intel
S1200SP introduces a BMC watchdog feature to provide a safe-guard against this scenario by providing an
automatic recovery mechanism. It also can provide automatic recovery of functionality that has failed due to a
fatal FW defect triggered by a rare sequence of events or a BMC hang due to some type of HW glitch (for
example, power).
This feature is comprised of a set of capabilities whose purpose is to detect misbehaving subsections of BMC
firmware, the BMC CPU itself, or HW subsystems of the BMC component, and to take appropriate action to
restore proper operation. The action taken is dependent on the nature of the detected failure and may result
in a restart of the BMC CPU, one or more BMC HW subsystems, or a restart of malfunctioning FW subsystems.
The BMC watchdog feature is designed to provide protection against the problems listed below regardless
•
of the state of the BMC FW and BMC component's internal HW when the problem is detected.
Linux* "kernel panic" – Results in reset of the entire FW stack (see Note1 below).
•
Hangs in individual threads/processes – Offending process may be reset or entire FW stack reset may be
•
required.
BMC CPU and/or BMC HW subsystems going into a faulted or unusable state due to triggers external to
•
the BMC component (for example, power glitches) – HW watchdog may be used to reset the BMC CPU
and/or affected BMC HW subsystems.

Table 14. Power Control Initiators

External Signal Name or
Internal Subsystem
Front panel power button
Internal BMC timer
Routed through command processor
Implemented by means of BMC internal
logic
Sleep S4/S5 signal (same as POWER_ON)
CPU Thermtrip
LAN
PCH Thermtrip
Fan failure and temperature critical
Power Supply Over Current/Over
Temperature
Capabilities
Turns power on or off
Turns power off, or power cycle
Turns power on or off, or power cycle
Turns power on when AC power returns
Turns power on or off
Turns power off
Turns power on
Pops up warning message.
Turns power off when temperature has
cross the threshold
Turns power off *
Turns power off * **
® server board
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