i9 BIOS
Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026

PCIe and Graphics

PCI Express Root Port 25

PCI Express Root Port 25 firmware setup page decoded from AMI HII/IFR resources.

Form ID
0x1587
Records
34
Path
Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 25

Record 4092

PCI Express Root Port 25

Firmware Value

Control the PCI Express Root Port.

Opcode
OneOf
Question ID
0xef7
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x117
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Record 4093

Connection Type

Firmware Value

Built-In: a built-in device is connected to this rootport.

Firmware help text

Built-In: a built-in device is connected to this rootport. SlotImplemented bit will be clear. Slot: this rootport connects to user-accessible slot. SlotImplemented bit will be set.

Opcode
OneOf
Question ID
0xef8
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x37f
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Built-in
1SlotStandard default

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}
  • {"condition_id": 1652, "type": "GrayOutIf", "offset": 506155, "expr": ["EqIdVal QuestionId: 0xF05, Value: 0x1"]}

Record 4094

ASPM

Firmware Value

Set the ASPM Level: Force L0s - Force all links to L0s State AUTO - BIOS auto configure DISABLE - Disables ASPM

Firmware help text

Set the ASPM Level: Force L0s - Force all links to L0s State AUTO - BIOS auto configure DISABLE - Disables ASPM

Opcode
OneOf
Question ID
0x15f8
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x133
Width
1 byte(s)
Range
0 to 4 step 0
ValueLabelMarkers
0DisabledStandard default
2L1
4Auto

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4095

L1 Substates

Firmware Value

PCI Express L1 Substates settings.

Opcode
OneOf
Question ID
0x1614
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2d7
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1L1.1
2L1.1 & L1.2

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4096

L1 Low

Firmware Value

PCI Express L1 Low Substate Enable/Disable.

Opcode
OneOf
Question ID
0xef9
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2f3
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4097

ACS

Firmware Value

Enable/Disable Access Control Services Extended Capability

Opcode
OneOf
Question ID
0xefa
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x30f
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4098

PTM

Firmware Value

Enable/Disable Precision Time Measurement

Opcode
OneOf
Question ID
0x1630
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x32b
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4099

DPC

Firmware Value

Enable/Disable Downstream Port Containment

Opcode
OneOf
Question ID
0xefb
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x347
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4100

EDPC

Firmware Value

Enable/Disable Rootport extensions for Downstream Port Containment

Opcode
OneOf
Question ID
0xefc
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x363
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4101

URR

Firmware Value

PCI Express Unsupported Request Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xefd
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x14f
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4102

FER

Firmware Value

PCI Express Device Fatal Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xefe
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x16b
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4103

NFER

Firmware Value

PCI Express Device Non-Fatal Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xeff
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x187
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4104

CER

Firmware Value

PCI Express Device Correctable Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xf00
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1a3
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4105

SEFE

Firmware Value

Root PCI Express System Error on Fatal Error Enable/Disable.

Opcode
OneOf
Question ID
0xf01
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1f7
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4106

SENFE

Firmware Value

Root PCI Express System Error on Non-Fatal Error Enable/Disable.

Opcode
OneOf
Question ID
0xf02
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x213
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4107

SECE

Firmware Value

Root PCI Express System Error on Correctable Error Enable/Disable.

Opcode
OneOf
Question ID
0xf03
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x22f
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4108

PME SCI

Firmware Value

PCI Express PME SCI Enable/Disable.

Opcode
OneOf
Question ID
0xf04
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x24b
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4109

Hot Plug

Firmware Value

PCI Express Hot Plug Enable/Disable.

Opcode
OneOf
Question ID
0xf05
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x267
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}
  • {"condition_id": 1653, "type": "GrayOutIf", "offset": 506707, "expr": ["EqIdVal QuestionId: 0xEF8, Value: 0x0"]}

Record 4110

Advanced Error Reporting

Firmware Value

Advanced Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xf06
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x283
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4111

PCIe Speed

Firmware Value

Configure PCIe Speed

Opcode
OneOf
Question ID
0xf07
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x29f
Width
1 byte(s)
Range
0 to 3 step 0
ValueLabelMarkers
0AutoStandard default
1Gen1
2Gen2
3Gen3

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4112

Transmitter Half Swing

Firmware Value

Transmitter Half Swing Enable/Disable.

Opcode
OneOf
Question ID
0xf08
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2bb
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4113

Detect Timeout

Firmware Value

The number of milliseconds reference code will wait for link to exit Detect state for enabled ports before assuming there is no device and potentially disabling the port.

Opcode
Numeric
Question ID
0xf09
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3b3
Width
2 byte(s)
Range
0 to 65535 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4114

Extra Bus Reserved

Firmware Value

Extra Bus Reserved (0-7) for bridges behind this Root Bridge.

Opcode
Numeric
Question ID
0xf0a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x537
Width
1 byte(s)
Range
0 to 7 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4115

Reserved Memory

Firmware Value

Reserved Memory for this Root Bridge (1-20) MB

Opcode
Numeric
Question ID
0xf0b
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x56b
Width
2 byte(s)
Range
1 to 20 step 1

Default store records

Store IDStore labelValueOption label
0Standard10

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4116

Reserved I/O

Firmware Value

Reserved I/O (4K/8K/12K/16K/20K) Range for this Root Bridge.

Opcode
Numeric
Question ID
0xf0c
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x58b
Width
1 byte(s)
Range
4 to 20 step 4

Default store records

Store IDStore labelValueOption label
0Standard4

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4117

LTR

Firmware Value

PCH PCIE Latency Reporting Enable/Disable

Opcode
OneOf
Question ID
0xf0d
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3fb
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4118

Snoop Latency Override

Firmware Value

Snoop Latency Override for PCH PCIE.

Firmware help text

Snoop Latency Override for PCH PCIE. Disabled: Disable override. Manual: Manually enter override values. Auto (default): Maintain default BIOS flow.

Opcode
OneOf
Question ID
0xf0e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x433
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}
  • {"condition_id": 1654, "type": "SuppressIf", "offset": 507022, "expr": ["EqIdVal QuestionId: 0xF0D, Value: 0x0"]}

Record 4119

Snoop Latency Value

Firmware Value

LTR Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xf0f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4bb
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}
  • {"condition_id": 1654, "type": "SuppressIf", "offset": 507022, "expr": ["EqIdVal QuestionId: 0xF0D, Value: 0x0"]}
  • {"condition_id": 1655, "type": "SuppressIf", "offset": 507070, "expr": ["EqIdVal QuestionId: 0xF0E, Value: 0x1", "Not"]}

Record 4120

Snoop Latency Multiplier

Firmware Value

LTR Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xf10
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x44f
Width
1 byte(s)
Range
0 to 5 step 0
ValueLabelMarkers
01 ns
132 ns
21024 nsStandard defaultManufacturing default
332768 ns
41048576 ns
533554432 ns

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}
  • {"condition_id": 1654, "type": "SuppressIf", "offset": 507022, "expr": ["EqIdVal QuestionId: 0xF0D, Value: 0x0"]}
  • {"condition_id": 1655, "type": "SuppressIf", "offset": 507070, "expr": ["EqIdVal QuestionId: 0xF0E, Value: 0x1", "Not"]}

Record 4121

Non Snoop Latency Override

Firmware Value

Non Snoop Latency Override for PCH PCIE.

Firmware help text

Non Snoop Latency Override for PCH PCIE. Disabled: Disable override. Manual: Manually enter override values. Auto (default): Maintain default BIOS flow.

Opcode
OneOf
Question ID
0xf11
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x46b
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}
  • {"condition_id": 1654, "type": "SuppressIf", "offset": 507022, "expr": ["EqIdVal QuestionId: 0xF0D, Value: 0x0"]}

Record 4122

Non Snoop Latency Value

Firmware Value

LTR Non Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xf12
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4f3
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}
  • {"condition_id": 1654, "type": "SuppressIf", "offset": 507022, "expr": ["EqIdVal QuestionId: 0xF0D, Value: 0x0"]}
  • {"condition_id": 1656, "type": "SuppressIf", "offset": 507214, "expr": ["EqIdVal QuestionId: 0xF11, Value: 0x1", "Not"]}

Record 4123

Non Snoop Latency Multiplier

Firmware Value

LTR Non Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xf13
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x487
Width
1 byte(s)
Range
0 to 5 step 0
ValueLabelMarkers
01 ns
132 ns
21024 nsStandard defaultManufacturing default
332768 ns
41048576 ns
533554432 ns

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}
  • {"condition_id": 1654, "type": "SuppressIf", "offset": 507022, "expr": ["EqIdVal QuestionId: 0xF0D, Value: 0x0"]}
  • {"condition_id": 1656, "type": "SuppressIf", "offset": 507214, "expr": ["EqIdVal QuestionId: 0xF11, Value: 0x1", "Not"]}

Record 4124

LTR Lock

Firmware Value

PCIE LTR Configuration Lock

Opcode
OneOf
Question ID
0xf14
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x417
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}

Record 4125

Peer Memory Write Enable

Firmware Value

Peer Memory Write Enable/Disable

Opcode
OneOf
Question ID
0xf15
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0xd6
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]}