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

PCIe and Graphics

PCI Express Root Port 28

PCI Express Root Port 28 firmware setup page decoded from AMI HII/IFR resources.

Form ID
0x158a
Records
34
Path
Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 28

Record 4194

PCI Express Root Port 28

Firmware Value

Control the PCI Express Root Port.

Opcode
OneOf
Question ID
0xf54
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x11a
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Record 4195

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
0xf55
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x382
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Built-in
1SlotStandard default

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}
  • {"condition_id": 1670, "type": "GrayOutIf", "offset": 510028, "expr": ["EqIdVal QuestionId: 0xF62, Value: 0x1"]}

Record 4196

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
0x15fb
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x136
Width
1 byte(s)
Range
0 to 4 step 0
ValueLabelMarkers
0DisabledStandard default
2L1
4Auto

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4197

L1 Substates

Firmware Value

PCI Express L1 Substates settings.

Opcode
OneOf
Question ID
0x1617
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2da
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1L1.1
2L1.1 & L1.2

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4198

L1 Low

Firmware Value

PCI Express L1 Low Substate Enable/Disable.

Opcode
OneOf
Question ID
0xf56
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2f6
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4199

ACS

Firmware Value

Enable/Disable Access Control Services Extended Capability

Opcode
OneOf
Question ID
0xf57
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x312
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4200

PTM

Firmware Value

Enable/Disable Precision Time Measurement

Opcode
OneOf
Question ID
0x1633
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x32e
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4201

DPC

Firmware Value

Enable/Disable Downstream Port Containment

Opcode
OneOf
Question ID
0xf58
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x34a
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4202

EDPC

Firmware Value

Enable/Disable Rootport extensions for Downstream Port Containment

Opcode
OneOf
Question ID
0xf59
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x366
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4203

URR

Firmware Value

PCI Express Unsupported Request Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xf5a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x152
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4204

FER

Firmware Value

PCI Express Device Fatal Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xf5b
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x16e
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4205

NFER

Firmware Value

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

Opcode
OneOf
Question ID
0xf5c
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x18a
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4206

CER

Firmware Value

PCI Express Device Correctable Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xf5d
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1a6
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4207

SEFE

Firmware Value

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

Opcode
OneOf
Question ID
0xf5e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1fa
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4208

SENFE

Firmware Value

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

Opcode
OneOf
Question ID
0xf5f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x216
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4209

SECE

Firmware Value

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

Opcode
OneOf
Question ID
0xf60
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x232
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4210

PME SCI

Firmware Value

PCI Express PME SCI Enable/Disable.

Opcode
OneOf
Question ID
0xf61
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x24e
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4211

Hot Plug

Firmware Value

PCI Express Hot Plug Enable/Disable.

Opcode
OneOf
Question ID
0xf62
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x26a
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}
  • {"condition_id": 1671, "type": "GrayOutIf", "offset": 510580, "expr": ["EqIdVal QuestionId: 0xF55, Value: 0x0"]}

Record 4212

Advanced Error Reporting

Firmware Value

Advanced Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xf63
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x286
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4213

PCIe Speed

Firmware Value

Configure PCIe Speed

Opcode
OneOf
Question ID
0xf64
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2a2
Width
1 byte(s)
Range
0 to 3 step 0
ValueLabelMarkers
0AutoStandard default
1Gen1
2Gen2
3Gen3

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4214

Transmitter Half Swing

Firmware Value

Transmitter Half Swing Enable/Disable.

Opcode
OneOf
Question ID
0xf65
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2be
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4215

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
0xf66
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3b9
Width
2 byte(s)
Range
0 to 65535 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4216

Extra Bus Reserved

Firmware Value

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

Opcode
Numeric
Question ID
0xf67
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x53a
Width
1 byte(s)
Range
0 to 7 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4217

Reserved Memory

Firmware Value

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

Opcode
Numeric
Question ID
0xf68
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x571
Width
2 byte(s)
Range
1 to 20 step 1

Default store records

Store IDStore labelValueOption label
0Standard10

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4218

Reserved I/O

Firmware Value

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

Opcode
Numeric
Question ID
0xf69
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x58e
Width
1 byte(s)
Range
4 to 20 step 4

Default store records

Store IDStore labelValueOption label
0Standard4

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4219

LTR

Firmware Value

PCH PCIE Latency Reporting Enable/Disable

Opcode
OneOf
Question ID
0xf6a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3fe
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4220

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
0xf6b
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x436
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}
  • {"condition_id": 1672, "type": "SuppressIf", "offset": 510895, "expr": ["EqIdVal QuestionId: 0xF6A, Value: 0x0"]}

Record 4221

Snoop Latency Value

Firmware Value

LTR Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xf6c
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4c1
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}
  • {"condition_id": 1672, "type": "SuppressIf", "offset": 510895, "expr": ["EqIdVal QuestionId: 0xF6A, Value: 0x0"]}
  • {"condition_id": 1673, "type": "SuppressIf", "offset": 510943, "expr": ["EqIdVal QuestionId: 0xF6B, Value: 0x1", "Not"]}

Record 4222

Snoop Latency Multiplier

Firmware Value

LTR Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xf6d
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x452
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": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}
  • {"condition_id": 1672, "type": "SuppressIf", "offset": 510895, "expr": ["EqIdVal QuestionId: 0xF6A, Value: 0x0"]}
  • {"condition_id": 1673, "type": "SuppressIf", "offset": 510943, "expr": ["EqIdVal QuestionId: 0xF6B, Value: 0x1", "Not"]}

Record 4223

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
0xf6e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x46e
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}
  • {"condition_id": 1672, "type": "SuppressIf", "offset": 510895, "expr": ["EqIdVal QuestionId: 0xF6A, Value: 0x0"]}

Record 4224

Non Snoop Latency Value

Firmware Value

LTR Non Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xf6f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4f9
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}
  • {"condition_id": 1672, "type": "SuppressIf", "offset": 510895, "expr": ["EqIdVal QuestionId: 0xF6A, Value: 0x0"]}
  • {"condition_id": 1674, "type": "SuppressIf", "offset": 511087, "expr": ["EqIdVal QuestionId: 0xF6E, Value: 0x1", "Not"]}

Record 4225

Non Snoop Latency Multiplier

Firmware Value

LTR Non Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xf70
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x48a
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": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}
  • {"condition_id": 1672, "type": "SuppressIf", "offset": 510895, "expr": ["EqIdVal QuestionId: 0xF6A, Value: 0x0"]}
  • {"condition_id": 1674, "type": "SuppressIf", "offset": 511087, "expr": ["EqIdVal QuestionId: 0xF6E, Value: 0x1", "Not"]}

Record 4226

LTR Lock

Firmware Value

PCIE LTR Configuration Lock

Opcode
OneOf
Question ID
0xf71
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x41a
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}

Record 4227

Peer Memory Write Enable

Firmware Value

Peer Memory Write Enable/Disable

Opcode
OneOf
Question ID
0xf72
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0xd9
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]}