Intel 8 LAN manual 1.4.1Ethernet Individual Address Words 00h - 02h, 1.4.2Reserved Word 03h

ICH8—NVM Information Guide

LAN	NVM					Image
Word	Byte	HIgh Byte (Bits 15:8)		Low Byte (Bits 7:0)	Used By
						Value
Offset	Offset
1Bh to	32h to		Reserved
2Fh	5Eh
30h to	60h to	PXE Software Region			PXE
3Eh	7Ch
3Fh	7Eh	Software Checksum (bytes 00h through 7Dh)			SW

Notes:

1.SW = Software: This is access from the network configuration tools and drivers.

2.PXE = PXE Boot Agent: This is access from the PXE Option ROM code in BIOS.

3.HW-Shared = Hardware - Shared: This is read on when the Shared Configuration is reset.

4.HW-PCI = Hardware - PCI: This is read when the PCI Configuration is reset.

1.4.1Ethernet Individual Address (Words 00h - 02h)

The Ethernet Individual Address (IA) is a six-byte field that must be unique for each adapter card or LOM and unique for each copy of the NVM image. The first three bytes are vendor specific. (For example, these bytes equal 00 AA 00 or 00 A0 C9 for Intel products.) The last three bytes must be unique for each copy of the NVM. OEM versions of the product might be required to have non-Intel ID’s in the first three byte positions. The value from this field is loaded into the Receive Address Register 0 (RAL0/RAH0). The Intel default is listed in Table 2.

Table 2. Ethernet Individual Address (Words 00h - 02h)

			Individual Address Byte
		Word 00		Word 01		Word 02
Manufacturer	MAC Address	Byte	Byte	Byte	Byte	Byte	Byte
		2	1	4	3	6	5
Intel (original)	00AA00XXYYZZh	AAh	00h	XXh	00h	ZZh	YYh
Intel (new)	00A0C9XXYYZZh	A0h	00h	XXh	C9h	ZZh	YYh

Note: The Ethernet IA is byte swapped, as listed in Table 2.

The IA bytes read from the NVM are used by the ICH8 until an IA Setup command is issued by software. The IA defined by the IA Setup command overrides the IA read from the NVM.

1.4.2Reserved (Word 03h)

Table 3.	Reserved (Word 03h)
	Bit	Name	Default	Description
	15:12	Reserved	0000b	These bits are reserved and should be set to 0000b.
	11	IBA LOM	1b	Must be set to 1b for Intel Boot Agent (IBA) to function correctly.
	10:0	Reserved	0h	These bits are reserved and should be set to 0h.

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