Gettemp0() And Gettemp1() Error Codes - Intel Quad-Core Xeon Datasheet

6.4.2.2 PECI Command Support
PECI command support is covered in detail in Platform Environment Control Interface
Specification. Please refer to this document for details on supported PECI command
function and codes
6.4.2.3 PECI Fault Handling Requirements
PECI is largely a fault tolerant interface, including noise immunity and error checking
improvements over other compatible industry standard interfaces. The PECI client is as
reliable as the device that it is embedded within, and thus given operating conditions
that fall under the specification, the PECI client will always respond to requests and the
protocol itself can be relied upon to detect any transmission failures. There are,
however, certain scenarios where PECI is known to be unresponsive.
Prior to a power on RESET# and during RESET# assertion, PECI is not guaranteed to
provide reliable thermal data. System designs should implement a default power-on
condition that ensures proper processor operation during the time frame when reliable
data is not available via PECI.
To protect platforms from potential operational or safety issues due to an abnormal
condition on PECI, the PECI host controller should take action to protect the system
from possible damage. It is recommended that the PECI host controller take
appropriate action to protect the client processor device if valid temperature readings
have not been obtained in response to three consecutive gettemp()s or for a one
second time interval. The PECI host controller may also implement an alert to software
in the event of a critical or continuous fault condition.
6.4.2.4 PECI GetTemp0() and GetTemp1() Error Code Support
The error codes supported for the processor GetTemp0() and GetTemp1() command
are listed in
Table 6-13. GetTemp0() and GetTemp1() Error Codes
Error Code
0x8000
0x8002
104
Table 6-13 below:
General sensor error
Sensor is operational, but has detected a temperature below its operational range
(underflow).
Description
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Quad-Core Intel® Xeon® Processor 5300 Series Datasheet
Thermal Specifications