Dell PowerEdge C5230 Hardware Owner's Manual page 64

Logging Format Conventions
The BIOS complies with the logging format defined in the IPMI
specification. IPMI requires the use of all but two bytes in each event log
entry, called Event Data 2 and Event Data 3. An event generator can specify
that these bytes contain OEM-specified values. The system BIOS uses these
two bytes to record additional information about the error.
This specification describes the format of the OEM data bytes (Event Data 2
and 3) for the following errors:
• Memory errors
• PCI Express bus errors
Event Data 2 and 3 are undefined for all other events that are logged by the
BIOS.
The system BIOS sensors are logical entities that generate events. The BIOS
ensures that each combination of sensor type (such as memory) and event
type (sensor-specific) has a unique sensor number.
64
Using the System Setup Program