Intel® Server Board S2600CW Family TPS
Intel® Server Board S2600CW Platform Management
Revision 2.4
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present; and the associated SDR is configured to enable a de-assertion event for that
condition.
5.3.3
BIOS Event-Only Sensors
BIOS-owned discrete sensors are used for event generation only and are not accessible
through IPMI sensor commands like the
Get Sensor Reading
command. Note that in this case
the sensor owner designated in the SDR is not the BMC.
An example of this usage would be the SELs logged by the BIOS for uncorrectable memory
errors. Such SEL entries would identify a BIOS-owned sensor ID.
5.3.4
Margin Sensors
There is sometimes a need for an IPMI sensor to report the difference (margin) from a
non-zero reference offset. For the purposes of this document, these type sensors are referred
to as margin sensors. For instance, for the case of a temperature margin sensor, if the
reference value is 90 degrees and the actual temperature of the device being monitored is 85
degrees, the margin value would be -5.
5.3.5
IPMI Watchdog Sensor
The BMC supports a Watchdog Sensor as a means to log SEL events due to expirations of the
IPMI 2.0 compliant Watchdog Timer.
5.3.6
BMC Watchdog Sensor
The BMC supports an IPMI sensor to report that a BMC reset has occurred due to an action
taken by the BMC Watchdog feature. A SEL event will be logged whenever either the BMC FW
stack is reset or the BMC CPU itself is reset.
5.3.7
BMC System Management Health Monitoring
The BMC tracks the health of each of its IPMI sensors and reports failures by providing a “BMC
FW Health” sensor of the IPMI 2.0 sensor type Management Subsystem Health with support
for the Sensor Failure offset. Only assertions should be logged into the SEL for the Sensor
Failure offset. The BMC Firmware Health sensor asserts for any sensor when 10 consecutive
sensor errors are read. These are not standard sensor events (that is, threshold crossings or
discrete assertions). These are BMC Hardware Access Layer (HAL) errors. If a successful sensor
read is completed, the counter resets to zero.
5.3.8
VR Watchdog Timer
The BMC FW monitors that the power sequence for the board VR controllers is completed
when a DC power-on is initiated. Incompletion of the sequence indicates a board problem, in
which case the FW powers down the system.
The BMC FW supports a discrete IPMI sensor for reporting and logging this fault condition.
