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NVM Information Guide—ICH8
18
1.4.23 PXE Words (Words 30h - 3Eh)
Words 30h through 3Eh (bytes 60h through 7Dh) have been reserved for configuration
and version values to be used by PXE code.
1.4.23.1 Boot Agent Main Setup Options (Word 30h)
The boot agent software configuration is controlled by the NVM with the main setup
options stored in word 30h. These options are those that can be changed by using the
Control-S setup menu or by using the IBA Intel Boot Agent utility. Note that these
settings only apply to Boot Agent software.
Table 18. Boot Agent Main Setup Options
Bit Name Description
15 PPB
PXE Presence.
Setting this bit to 0b Indicates that the image in the Flash contains a
PXE image.
Setting this bit to 1b indicates that no PXE image is contained.
The default for this bit is 0b for backwards compatibility with existing
systems already in the field.
If this bit is set to 0b, EEPROM word 32h (PXE Version) is valid. When
EPB is set to 1b and this bit is set to 0b, indicates that both images are
present in the Flash.
14 EPB
EFI Presence.
Setting this bit to 1b Indicates that the image in the Flash contains an
EFI image.
Setting this bit to 0b indicates that no EFI image is contained.
The default for this bit is 0b for backwards compatibility with existing
systems already in the field.
If this bit is set to 1b, EEPROM word 33h (EFI Version) is valid. When
PPB is set to 0b and this bit is set to 1b, indicates that both images
(PXE and EFI) are present in the Flash.
13 Reserved Reserved for future use. This bit must be set to 0b.
12 FDP
Force Full Duplex.
Set this bit to 0b for half duplex and 1b for full duplex.
Note that this bit is a don’t care unless bits 10 and 11 are set.
11:10 FSP
Force Speed.
These bits determine speed.
01b = 10 Mb/s
10b = 100 Mb/s
11b = Not allowed.
All zeros indicate auto-negotiate (the current bit state).
Note that bit 12 is a don’t care unless these bits are set.
9 Reserved
Reserved
Set this bit to 0b.
8DSM
Display Setup Message.
If this bit is set to 1b, the "Press Control-S" message appears after the
title message.
The default for this bit is 1b.