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

PCIe and Graphics

PCI Express Root Port 2

PCI Express Root Port 2 firmware setup page decoded from AMI HII/IFR resources.

Form ID
0x1034
Records
34
Path
Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 2

Record 3310

PCI Express Root Port 2

Firmware Value

Control the PCI Express Root Port.

Opcode
OneOf
Question ID
0xc2e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x100
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Record 3311

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
0xc2f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x368
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Built-in
1SlotStandard default

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}
  • {"condition_id": 1514, "type": "GrayOutIf", "offset": 476462, "expr": ["EqIdVal QuestionId: 0xC3C, Value: 0x1"]}

Record 3312

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
0x15e1
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x11c
Width
1 byte(s)
Range
0 to 4 step 0
ValueLabelMarkers
0DisabledStandard default
2L1
4Auto

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3313

L1 Substates

Firmware Value

PCI Express L1 Substates settings.

Opcode
OneOf
Question ID
0x15fd
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2c0
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1L1.1
2L1.1 & L1.2

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3314

L1 Low

Firmware Value

PCI Express L1 Low Substate Enable/Disable.

Opcode
OneOf
Question ID
0xc30
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2dc
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3315

ACS

Firmware Value

Enable/Disable Access Control Services Extended Capability

Opcode
OneOf
Question ID
0xc31
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2f8
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3316

PTM

Firmware Value

Enable/Disable Precision Time Measurement

Opcode
OneOf
Question ID
0x1619
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x314
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3317

DPC

Firmware Value

Enable/Disable Downstream Port Containment

Opcode
OneOf
Question ID
0xc32
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x330
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3318

EDPC

Firmware Value

Enable/Disable Rootport extensions for Downstream Port Containment

Opcode
OneOf
Question ID
0xc33
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x34c
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3319

URR

Firmware Value

PCI Express Unsupported Request Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xc34
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x138
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3320

FER

Firmware Value

PCI Express Device Fatal Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xc35
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x154
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3321

NFER

Firmware Value

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

Opcode
OneOf
Question ID
0xc36
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x170
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3322

CER

Firmware Value

PCI Express Device Correctable Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xc37
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x18c
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3323

SEFE

Firmware Value

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

Opcode
OneOf
Question ID
0xc38
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1e0
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3324

SENFE

Firmware Value

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

Opcode
OneOf
Question ID
0xc39
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1fc
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3325

SECE

Firmware Value

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

Opcode
OneOf
Question ID
0xc3a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x218
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3326

PME SCI

Firmware Value

PCI Express PME SCI Enable/Disable.

Opcode
OneOf
Question ID
0xc3b
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x234
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3327

Hot Plug

Firmware Value

PCI Express Hot Plug Enable/Disable.

Opcode
OneOf
Question ID
0xc3c
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x250
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}
  • {"condition_id": 1515, "type": "GrayOutIf", "offset": 477014, "expr": ["EqIdVal QuestionId: 0xC2F, Value: 0x0"]}

Record 3328

Advanced Error Reporting

Firmware Value

Advanced Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xc3d
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x26c
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3329

PCIe Speed

Firmware Value

Configure PCIe Speed

Opcode
OneOf
Question ID
0xc3e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x288
Width
1 byte(s)
Range
0 to 3 step 0
ValueLabelMarkers
0AutoStandard default
1Gen1
2Gen2
3Gen3

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3330

Transmitter Half Swing

Firmware Value

Transmitter Half Swing Enable/Disable.

Opcode
OneOf
Question ID
0xc3f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2a4
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3331

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
0xc40
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x385
Width
2 byte(s)
Range
0 to 65535 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3332

Extra Bus Reserved

Firmware Value

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

Opcode
Numeric
Question ID
0xc41
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x520
Width
1 byte(s)
Range
0 to 7 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3333

Reserved Memory

Firmware Value

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

Opcode
Numeric
Question ID
0xc42
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x53d
Width
2 byte(s)
Range
1 to 20 step 1

Default store records

Store IDStore labelValueOption label
0Standard10

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3334

Reserved I/O

Firmware Value

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

Opcode
Numeric
Question ID
0xc43
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x574
Width
1 byte(s)
Range
4 to 20 step 4

Default store records

Store IDStore labelValueOption label
0Standard4

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3335

LTR

Firmware Value

PCH PCIE Latency Reporting Enable/Disable

Opcode
OneOf
Question ID
0xc44
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3e4
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3336

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
0xc45
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x41c
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}
  • {"condition_id": 1516, "type": "SuppressIf", "offset": 477329, "expr": ["EqIdVal QuestionId: 0xC44, Value: 0x0"]}

Record 3337

Snoop Latency Value

Firmware Value

LTR Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xc46
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x48d
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}
  • {"condition_id": 1516, "type": "SuppressIf", "offset": 477329, "expr": ["EqIdVal QuestionId: 0xC44, Value: 0x0"]}
  • {"condition_id": 1517, "type": "SuppressIf", "offset": 477377, "expr": ["EqIdVal QuestionId: 0xC45, Value: 0x1", "Not"]}

Record 3338

Snoop Latency Multiplier

Firmware Value

LTR Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xc47
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x438
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": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}
  • {"condition_id": 1516, "type": "SuppressIf", "offset": 477329, "expr": ["EqIdVal QuestionId: 0xC44, Value: 0x0"]}
  • {"condition_id": 1517, "type": "SuppressIf", "offset": 477377, "expr": ["EqIdVal QuestionId: 0xC45, Value: 0x1", "Not"]}

Record 3339

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
0xc48
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x454
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}
  • {"condition_id": 1516, "type": "SuppressIf", "offset": 477329, "expr": ["EqIdVal QuestionId: 0xC44, Value: 0x0"]}

Record 3340

Non Snoop Latency Value

Firmware Value

LTR Non Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xc49
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4c5
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}
  • {"condition_id": 1516, "type": "SuppressIf", "offset": 477329, "expr": ["EqIdVal QuestionId: 0xC44, Value: 0x0"]}
  • {"condition_id": 1518, "type": "SuppressIf", "offset": 477521, "expr": ["EqIdVal QuestionId: 0xC48, Value: 0x1", "Not"]}

Record 3341

Non Snoop Latency Multiplier

Firmware Value

LTR Non Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xc4a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x470
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": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}
  • {"condition_id": 1516, "type": "SuppressIf", "offset": 477329, "expr": ["EqIdVal QuestionId: 0xC44, Value: 0x0"]}
  • {"condition_id": 1518, "type": "SuppressIf", "offset": 477521, "expr": ["EqIdVal QuestionId: 0xC48, Value: 0x1", "Not"]}

Record 3342

LTR Lock

Firmware Value

PCIE LTR Configuration Lock

Opcode
OneOf
Question ID
0xc4b
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x400
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}

Record 3343

Peer Memory Write Enable

Firmware Value

Peer Memory Write Enable/Disable

Opcode
OneOf
Question ID
0xc4c
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0xbf
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]}