11
ICH8/ICH9—NVM Information Guide
1.4.6
PCI Initialization Control (Word 0Ah)
This word contains initialization values that:
• Set defaults for some internal registers.
• Enable/disable specific features.
• Determine which PCI configuration space values are loaded from the NVM.
1.4.7
Subsystem ID (Word 0Bh)
If Load Subsystem IDs bit of word 0Ah is set to 1b, this word is read in to initialize the
Subsystem ID. The Subsystem ID default value is 0000h.
1.4.8
Subsystem Vendor ID (Word 0Ch)
If Load Subsystem IDs bit of word 0Ah is set to 1b, this word is read in to initialize the
Subsystem Vendor ID. The Subsystem Vendor ID default value is 8086h.
Table 6.
Initialization Control Word (Word 0Ah)
Bit
Name
Default
Description
15:12
Reserved
0001b
This field is reserved and should be set to 0001b.
11:8
Reserved
0000b
These bits are reserved and should be set to 0000b.
7
AUX PWR
1b
This bit is used as an auxiliary power indication. It is used in
conjunction with the
PM Enable
bit.
0b = D3cold wake-up is not advertised.
1b = D3cold wake-up is advertised in the PMC register of the PCI
function if the
PM Enable
bit is also set.
6
PM Enable
1b
This bit enables the assertion of a PME in the PCI function at any
power state.
0b = PME functionality is disabled.
1b = PME functionality is enabled.
This bit affects the advertised PME_Support indication in the PMC
register of the PCI function.
5:3
Reserved
00b
This bit is reserved and should be set to 00b.
2
APM Enable
1b
When APM Enable is set, both the PHY (
82566
or
82562V
) and
the MAC should be initialized to a functional state following power
up.
0b = APM functionality is disabled.
1b = APM functionality is enabled.
Note:
This is a reserved bit for the
ICH8
(B1 stepping) and the
ICH9
.
1
Load Subsystem IDs 1b
0b = Device loads the default PCI Subsystem ID and Subsystem
Vendor ID.
1b = Device loads its PCIe* Subsystem ID and Subsystem Vendor
ID from the NVM (words 0Bh and 0Ch).
0
Load Vendor/Device
IDs
1b
0b = Device loads the default PCI Vendor and Device IDs.
1b = Device loads the default values for PCI Vendor and Device IDs
from the NVM (words 0Dh and 0Eh).
