Intel® Server Board X38ML
Platform Management
Revision 1.3
Intel order number E15331-006
67
5.14
Sensor Rearm Behavior
A sensor configured in the SDR to show an asserted event status can also be configured to
enable a de-assertion event for the condition. All manual and auto-rearm sensors that are
configured in this way generate a de-assertion SEL event when the sensor is rearmed. This
occurs whether the sensor is re-armed by an IPMI command, by the BMC initialization agent, or
by sensor-specific re-arm trigger events. For example, the insertion of a hot-swap fan should re-
arm an associated manual re-arm fan tach sensor. This applies to both threshold/analog
sensors and to discrete sensors.
If the condition that caused the assertion is no longer present when the re-arm occurs, then the
following sequence of events occurs:
1. The failure condition occurs and the BMC logs an assertion event.
2. The sensor is re-armed.
3. The BMC clears the sensor status and generates a de-assertion event.
4. The sensor is put into the init in progress state until the sensor is polled again or is
updated.
5. The sensor is polled and the init in progress state is cleared.
If the condition that caused the assertion is present at the time the re-arm occurs, then the
sequence is as follows:
1. The failure condition occurs and the BMC logs an assertion event.
2. The sensor is re-armed.
3. The BMC clears the sensor status and generates a de-assertion event.
4. The sensor is put into the init in progress state until the sensor is polled again or is
updated.
5. The sensor is polled, the failure is detected, and the BMC logs an assertion event.
Auto-rearm sensors show an asserted event status. These sensors generate a de-assertion
SEL event when the BMC detects that one condition caused the assertion is no longer present.
And then the associated SDR is configured to enable a de-assertion event for that condition.
Auto-rearm sensors show an asserted event status. The condition causes one assertion. These
sensors generate a de-assertion SEL event when the BMC detects one condition is no longer
present. The associated SDR is configured to enable a de-assertion event for that condition.
