Vol 1

PIROM
188 Intel® Xeon® Product 2800/4800/8800 v2 Product Family
Datasheet Volume One, February 2014
9.3.8.7 STTCKS: Static Checksum
This location provides the checksum of the static values per SKU. Writes to this register
have no effect.
9.3.9 Electronic Signature
This section contains a large reserved area, and items added after the original format
for the Intel® Xeon® E7 v2 processor PIROM was set.
9.3.9.1 ESIG: Electronic Signature
This location contains a 64-bit identification number. The value in this field is either an
electronic signature. Writes to this register have no effect.
9.3.9.2 ESCKS: Electronic Signature Checksum
This location provides the checksum for the Other Data Section. Writes to this register
have no effect.
9.3.10 Checksums
The PIROM includes multiple checksums. Table 9-4 includes the checksum values for
each section defined in the 128-byte ROM.
Checksums are automatically calculated and programmed by Intel®. The first step in
calculating the checksum is to add each byte from the field to the next subsequent
byte. This result is then negated to provide the checksum.
Offset: 76h
Bit Description
7:0 Static Checksum
One-byte checksum of the Static Checksum
00h- FFh: See Section 9.3.10 for calculation of this value.
Offset: 77h-7Eh
Bit Description
63:0 Electronic Signature
0000000000000000h-FFFFFFFFFFFFFFFFh: Electronic Signature
Offset: 7Fh
Bit Description
7:0 Other Data Checksum
One-byte checksum of the Other Data Checksum
00h- FFh: See Section 9.3.10 for calculation of this value.
Table 9-4. 128-Byte ROM Checksum Values
Section Checksum Address
Static Features 76h
Electronic Signature 7Fh