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Hardware Accessed Words — Intel
®
82575EB Gigabit Ethernet Controller
324632-003 Intel
®
82575EB Gigabit Ethernet Controller
Revision: 2.1 Software Developer’s Manual and EEPROM Guide
January 2011 75
The main setup options are stored in word 30h. These options are those that can be changed by the
user via the Control-S setup menu. Word 30h has the following format:
Bit(s) Name Default Description
15:13 RFU 0x0 Reserved. Must be 0.
12:10 FSD 0x0 Bits 12-10 control forcing speed and duplex during driver operation.
Valid values are:
000b – Auto-negotiate
001b – 10Mbps Half Duplex
010b – 100Mbps Half Duplex
011b – Not valid (treated as 000b)
100b – 10Mbps Full Duplex
101b – 100Mbps Full Duplex
111b – 1000Mbps Full Duplex
Only applicable for copper-based adapters. Not applicable to 10GbE.
Default value is 000b.
9 RSV 0b Reserved. Set to 0.
8 DSM 1b Display Setup Message.
If the bit is set to 1, the Press Control-S message is displayed after the title
message.
Default value is 1.
7:6 PT 0x0 Prompt Time.
These bits control how long the CTRL-S setup prompt message is displayed, if
enabled by DIM.
00 = 2 seconds (default)
01 = 3 seconds
10 = 5 seconds
11 = 0 seconds
Note: CTRL-S message is not displayed if 0 seconds prompt time is selected.
5 IBD 0b iSCSI Boot Disable.
4:3 DBS 0b Default Boot Selection.
These bits select which device is the default boot device. These bits are only
used if the agent detects that the BIOS does not support boot order selection
or if the MODE field of word 31h is set to MODE_LEGACY.
00 = Network boot, then local boot (default)
01 = Local boot, then network boot
10 = Network boot only
11 = Local boot only
2 DEP 0b Deprecated. Must be 0.
1:0 PS 0x0 Protocol Select.
These bits select the active boot protocol.
00 = PXE (default value)
01 = RPL (only if RPL is in the flash)
10 = iSCSI Boot primary port (only if iSCSI Boot is using this adapter)
11 = iSCSI Boot secondary port (only if iSCSI Boot is using this adapter)
Only the default value of 00b should be initially programmed into the adapter;
other values should only be set by configuration utilities.