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82575EB Gigabit Ethernet Controller — Hardware Accessed Words
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
80 January 2011
The maximum amount of boot configuration information that is stored is 834 bytes (417 words);
however, the iSCSI boot implementation can limit this value in order to work with a smaller EEPROM.
Variable length fields are used to limit the total amount of EEPROM that is used for iSCSI boot
information. Each field is preceded by a single byte that indicates how much space is available for that
field. For example, if the Initiator Name field is being limited to 128 bytes, then it is preceded with a
single byte with the value of 128. The following field begins at 128 bytes after the beginning of the
Initiator Name field regardless of the actual size of the field. The variable length fields must be NULL
terminated unless they reach the maximum size specified in the length byte.
4.5.1.29.14 Checksum Word (Word 3Fh)
The checksum word (0x3F) is used to ensure that the base EEPROM image is a valid image. The value
of this word should be calculated such that after adding all the words (0x00:0x3F), including the
checksum word itself, the sum should be 0xBABA. The initial value in the 16-bit summing register
should be 0x0000 and the carry bit should be ignored after each addition.
Note: Hardware does not calculate the word 0x3F checksum during EEPROM write; it must be
calculated by software independently and included in the EEPROM write data. Hardware
does not compute a checksum over words 0x00:0x3F during EEPROM reads in order to
determine validity of the EEPROM image; this field is provided strictly for software
verification of EEPROM validity. All hardware configurations based on word 0x00:0x3F
content is based on the validity of the Signature field of EEPROM Initialization Control Word
1 (Signature must be 01b).
Reserved 2 Reserved
Mutual CHAP Password 16 + 2 The minimum mutual CHAP secret must be 12 octets and maximum mutual
CHAP secret size is 16. The last 2 bytes are null alignment padding.
Reserved 160 Reserved for future use.