Platform Management Functional Overview Intel® Server Board S1200V3RP TPS
Revision 1.2
6.4 Power Control Sources
The server board supports several power control sources which can initiate a power-up or
power-down activity.
Table 17. Power Control Initiators
External Signal Name or
Internal Subsystem
Turns power off, or power cycle
Routed through command processor
Turns power on or off, or power cycle
Implemented by means of BMC internal
logic
Turns power on when AC power returns
Sleep S4/S5 signal (same as
POWER_ON)
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
®
S1200V3RP Server Platforms introduce 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 only allows up to three resets of the BMC CPU (such as HW reset)
or entire FW stack (such as a SW reset) before giving up and remaining in the uBOOT code.
This count is cleared upon cycling of power to the BMC or upon continuous operation of the
BMC without a watchdog-generated reset occurring for a period of greater than 30 minutes. The
BMC FW logs a SEL event indicating that a watchdog-generated BMC reset (either soft or hard
reset) has occurred. This event may be logged after the actual reset has occurred. Refer to
sensor section for details for the related sensor definition. The BMC will also indicate a
degraded system status on the Front Panel Status LED after a BMC HW reset or FW stack
reset. This state (which follows the state of the associated sensor) will be cleared upon system
reset or (AC or DC) power cycle.
Note: A reset of the BMC may result in the following system degradations that will require a
system reset or power cycle to correct:
1. Timeout value for the rotation period can be set using this parameter. Potentially, there will
be incorrect ACPI Power State reported by the BMC.
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