Intel E5-2600 Multi-Domain Commands, Enumerating Peci Client Capabilities, Domain ID Definition

2.5.3.10Enumerating 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 2-2may 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.

2.5.4Multi-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	Domain 1
	Code	Code
GetTemp()	0x01	0x02
RdPkgConfig()	0xa1	0xa2
WrPkgConfig()	0xa5	0xa6
RdIAMSR()	0xb1	0xb2
RdPCIConfig()	0x61	0x62
RdPCIConfigLocal()	0xe1	0xe2
WrPCIConfigLocal()	0xe5	0xe6

74	Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families
	Datasheet Volume One