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Features
116 Intel® Xeon® Processor 7400 Series Datasheet
7.4.3.1.1 DFR: Data Format Revision
This location identifies the data format revision of the PIROM data structure. Writes to
this register have no effect.
Example: The Intel® Xeon® Processor 7400 Series will use 04h at offset 00h.
Note: Changes from Third Revision:
1. The Number of cores field in PTCI: Processor Thread and Core Information at offset
79h was extended to six bits. It now defined as Number of Core = Bits [7:2]. It
previously was defined as Bits [3:2]
7.4.3.1.2 PISIZE: PIROM Size
This location identifies the PIROM size. Writes to this register have no effect.
7.4.3.1.3 PDA: Processor Data Address
This location provides the offset to the Processor Data Section. Writes to this register
have no effect.
Offset: 00h
Bit Description
7:0 Data Format Revision
The data format revision is used whenever fields within the PIROM are
redefined. The initial definition will begin at a value of 1. If a field, or bit
assignment within a field, is changed such that software needs to discern
between the old and new definition, then the data format revision field will be
incremented.
00h: Reserved
01h: Initial definition
02h: Second revision
03h: Third revision
04h: Fourth revision (Defined by this EMTS)
05h-FFh: Reserved
Offset: 01h-02h
Bit Description
15:0 PIROM Size
The PIROM size provides the size of the device in hex bytes. The MSB is at
location 01h, the LSB is at location 02h.
0000h - 007Fh: Reserved
0080h: 128 byte PIROM size
0081- FFFFh: Reserved
Offset: 03h
Bit Description
7:0 Processor Data Address
Byte pointer to the Processor Data section
00h: Processor Data section not present
01h - 0Dh: Reserved
0Eh: Processor Data section pointer value
0Fh-FFh: Reserved
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