Intel E5-1600, CM8062101038606 WrPCIConfigLocal, RdPCIConfigLocal Response Definition Sheet 2

Table 2-13. RdPCIConfigLocal() Response Definition (Sheet 2 of 2)

Response Meaning

CC:0x82 The processor hardware resources required to service this command are in a low power state. Retry may be appropriate after modification of PECI wake mode behavior if appropriate.

CC: 0x90 Unknown/Invalid/Illegal Request

CC:0x91 PECI control hardware, firmware or associated logic error. The processor is unable to process the request.

2.5.2.10WrPCIConfigLocal()

The WrPCIConfigLocal() command provides sideband write access to the PCI configuration space that resides within the processor. PECI originators can access this space even before BIOS enumeration of the system buses. The exact listing of supported devices and functions for writes using this command on the processor is defined in Table 2-19. The write accesses to registers that are locked will not take effect but will still return a completion code of 0x40. However, write accesses to registers that are hidden will return a completion code of 0x90.

Because a WrPCIConfigLocal() command results in an update to potentially critical registers inside the processor, it includes an Assured Write FCS (AW FCS) byte as part of the write data payload. In the event that the AW FCS mismatches with the client-calculated FCS, the client will abort the write and will always respond with a bad write FCS.

PCI Configuration addresses are constructed as shown in Figure 2-46. The write command is subject to the same address configuration rules as defined in Section 2.5.2.9. PCI configuration writes may be issued in byte, word or dword granularity.

2.5.2.10.1Command Format

The WrPCIConfigLocal() format is as follows:

Write Length: 0x07 (byte), 0x08 (word), 0x0a (dword)

Read Length: 0x01

Command: 0xe5

AW FCS Support: Yes

Description: Writes the data sent to the requested register address. Write Length dictates the desired write granularity. The command always returns a completion code indicating pass/fail status. Refer to Section 2.5.5.2 for details on completion codes.

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