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Software Developer’s Manual 117
EEPROM Interface
Table 5-15. 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 in order to be backwards compatible 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 in order to be backwards compatible 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. Set this bit to 0b.
12 FDP
Force Full Duplex.
Set this bit to 0b for half duplex; set to 1b for full duplex.
Note that this bit is a don’t care unless bits 10 and 11 are set.
11:10 FSP
These bits determine speed. 01b = 10 Mbs, 10b = 100 Mbs, 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 for future use. 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.
7:6 PT
Prompt Time. These bits control how long the "Press Control-S" setup
prompt message appears, if enabled by DIM.
00b = 2 seconds (default)
01b = 3 seconds
10b = 5 seconds
11b = 0 seconds
Note that the Ctrl-S message does not appear if 0 seconds prompt time
is selected.
5LBS
Local Boot Selection (OBSOLETE). In previous versions of the agent,
this bit enables or disables local boot, if the DBS bit selects it.
The default for this bit is 1b; enable local booting. The boot agent, at
runtime, no longer uses this bit.