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74 Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families
Datasheet Volume One
2.5.3.10 Enumerating PECI Client Capabilities
The PECI host originator should be designed to support all optional but desirable
features from all processors of interest. Each feature has a discovery method and
response code that indicates availability on the destination PECI client.
The first step in the enumeration process would be for the PECI host to confirm the
Revision Number through the use of the GetDIB() command. The revision number
returned by the PECI client processor always maps to the revision number of the PECI
specification that it is designed to. The Minor Revision Number as described in Table 2-2
may be used to identify the subset of PECI commands that the processor in question
supports for any major PECI revision.
The next step in the enumeration process is to utilize the desired command suite in a
real execution context. If the Write FCS response is an Abort FCS or if the data
returned includes an “Unknown/Invalid/Illegal Request” completion code (0x90), then
the command is unsupported.
Enumerating known commands without real, execution context data, or attempting
undefined commands, is dangerous because a write command could result in
unexpected behavior if the data is not properly formatted. Methods for enumerating
write commands using carefully constructed and innocuous data are possible, but are
not guaranteed by the PECI client definition.
This enumeration procedure is not robust enough to detect differences in bit definitions
or data interpretation in the message payload or client response. Instead, it is only
designed to enumerate discrete features.
2.5.4 Multi-Domain Commands
The processor does not support multiple domains, but it is possible that future products
will, and the following tables are included as a reference for domain-specific definitions.
Table 2-19. Domain ID Definition
Domain ID Domain Number
0b01 0
0b10 1
Table 2-20. Multi-Domain Command Code Reference
Command Name
Domain 0
Code
Domain 1
Code
GetTemp() 0x01 0x02
RdPkgConfig()
0xa1 0xa2
WrPkgConfig()
0xa5 0xa6
RdIAMSR()
0xb1 0xb2
RdPCIConfig()
0x61 0x62
RdPCIConfigLocal()
0xe1 0xe2
WrPCIConfigLocal()
0xe5 0xe6