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

PCIe and Graphics

PCI Express Root Port 8

PCI Express Root Port 8 firmware setup page decoded from AMI HII/IFR resources.

Form ID
0x103a
Records
34
Path
Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 8

Record 3514

PCI Express Root Port 8

Firmware Value

Control the PCI Express Root Port.

Opcode
OneOf
Question ID
0xce8
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x106
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Record 3515

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
0xce9
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x36e
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Built-in
1SlotStandard default

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}
  • {"condition_id": 1550, "type": "GrayOutIf", "offset": 484208, "expr": ["EqIdVal QuestionId: 0xCF6, Value: 0x1"]}

Record 3516

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
0x15e7
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x122
Width
1 byte(s)
Range
0 to 4 step 0
ValueLabelMarkers
0DisabledStandard default
2L1
4Auto

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3517

L1 Substates

Firmware Value

PCI Express L1 Substates settings.

Opcode
OneOf
Question ID
0x1603
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2c6
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1L1.1
2L1.1 & L1.2

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3518

L1 Low

Firmware Value

PCI Express L1 Low Substate Enable/Disable.

Opcode
OneOf
Question ID
0xcea
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2e2
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3519

ACS

Firmware Value

Enable/Disable Access Control Services Extended Capability

Opcode
OneOf
Question ID
0xceb
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2fe
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3520

PTM

Firmware Value

Enable/Disable Precision Time Measurement

Opcode
OneOf
Question ID
0x161f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x31a
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3521

DPC

Firmware Value

Enable/Disable Downstream Port Containment

Opcode
OneOf
Question ID
0xcec
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x336
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3522

EDPC

Firmware Value

Enable/Disable Rootport extensions for Downstream Port Containment

Opcode
OneOf
Question ID
0xced
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x352
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3523

URR

Firmware Value

PCI Express Unsupported Request Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xcee
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x13e
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3524

FER

Firmware Value

PCI Express Device Fatal Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xcef
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x15a
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3525

NFER

Firmware Value

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

Opcode
OneOf
Question ID
0xcf0
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x176
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3526

CER

Firmware Value

PCI Express Device Correctable Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xcf1
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x192
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3527

SEFE

Firmware Value

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

Opcode
OneOf
Question ID
0xcf2
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1e6
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3528

SENFE

Firmware Value

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

Opcode
OneOf
Question ID
0xcf3
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x202
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3529

SECE

Firmware Value

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

Opcode
OneOf
Question ID
0xcf4
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x21e
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3530

PME SCI

Firmware Value

PCI Express PME SCI Enable/Disable.

Opcode
OneOf
Question ID
0xcf5
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x23a
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3531

Hot Plug

Firmware Value

PCI Express Hot Plug Enable/Disable.

Opcode
OneOf
Question ID
0xcf6
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x256
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}
  • {"condition_id": 1551, "type": "GrayOutIf", "offset": 484760, "expr": ["EqIdVal QuestionId: 0xCE9, Value: 0x0"]}

Record 3532

Advanced Error Reporting

Firmware Value

Advanced Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xcf7
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x272
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3533

PCIe Speed

Firmware Value

Configure PCIe Speed

Opcode
OneOf
Question ID
0xcf8
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x28e
Width
1 byte(s)
Range
0 to 3 step 0
ValueLabelMarkers
0AutoStandard default
1Gen1
2Gen2
3Gen3

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3534

Transmitter Half Swing

Firmware Value

Transmitter Half Swing Enable/Disable.

Opcode
OneOf
Question ID
0xcf9
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2aa
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3535

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
0xcfa
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x391
Width
2 byte(s)
Range
0 to 65535 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3536

Extra Bus Reserved

Firmware Value

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

Opcode
Numeric
Question ID
0xcfb
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x526
Width
1 byte(s)
Range
0 to 7 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3537

Reserved Memory

Firmware Value

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

Opcode
Numeric
Question ID
0xcfc
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x549
Width
2 byte(s)
Range
1 to 20 step 1

Default store records

Store IDStore labelValueOption label
0Standard10

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3538

Reserved I/O

Firmware Value

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

Opcode
Numeric
Question ID
0xcfd
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x57a
Width
1 byte(s)
Range
4 to 20 step 4

Default store records

Store IDStore labelValueOption label
0Standard4

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3539

LTR

Firmware Value

PCH PCIE Latency Reporting Enable/Disable

Opcode
OneOf
Question ID
0xcfe
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3ea
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3540

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
0xcff
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x422
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}
  • {"condition_id": 1552, "type": "SuppressIf", "offset": 485075, "expr": ["EqIdVal QuestionId: 0xCFE, Value: 0x0"]}

Record 3541

Snoop Latency Value

Firmware Value

LTR Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xd00
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x499
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}
  • {"condition_id": 1552, "type": "SuppressIf", "offset": 485075, "expr": ["EqIdVal QuestionId: 0xCFE, Value: 0x0"]}
  • {"condition_id": 1553, "type": "SuppressIf", "offset": 485123, "expr": ["EqIdVal QuestionId: 0xCFF, Value: 0x1", "Not"]}

Record 3542

Snoop Latency Multiplier

Firmware Value

LTR Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xd01
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x43e
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": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}
  • {"condition_id": 1552, "type": "SuppressIf", "offset": 485075, "expr": ["EqIdVal QuestionId: 0xCFE, Value: 0x0"]}
  • {"condition_id": 1553, "type": "SuppressIf", "offset": 485123, "expr": ["EqIdVal QuestionId: 0xCFF, Value: 0x1", "Not"]}

Record 3543

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
0xd02
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x45a
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}
  • {"condition_id": 1552, "type": "SuppressIf", "offset": 485075, "expr": ["EqIdVal QuestionId: 0xCFE, Value: 0x0"]}

Record 3544

Non Snoop Latency Value

Firmware Value

LTR Non Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xd03
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4d1
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}
  • {"condition_id": 1552, "type": "SuppressIf", "offset": 485075, "expr": ["EqIdVal QuestionId: 0xCFE, Value: 0x0"]}
  • {"condition_id": 1554, "type": "SuppressIf", "offset": 485267, "expr": ["EqIdVal QuestionId: 0xD02, Value: 0x1", "Not"]}

Record 3545

Non Snoop Latency Multiplier

Firmware Value

LTR Non Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xd04
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x476
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": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}
  • {"condition_id": 1552, "type": "SuppressIf", "offset": 485075, "expr": ["EqIdVal QuestionId: 0xCFE, Value: 0x0"]}
  • {"condition_id": 1554, "type": "SuppressIf", "offset": 485267, "expr": ["EqIdVal QuestionId: 0xD02, Value: 0x1", "Not"]}

Record 3546

LTR Lock

Firmware Value

PCIE LTR Configuration Lock

Opcode
OneOf
Question ID
0xd05
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x406
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}

Record 3547

Peer Memory Write Enable

Firmware Value

Peer Memory Write Enable/Disable

Opcode
OneOf
Question ID
0xd06
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0xc5
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]}