Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026
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Overview / Manual / PCI Express Root Port 4
PCIe and Graphics
PCI Express Root Port 4
PCI Express Root Port 4 firmware setup page decoded from AMI HII/IFR resources.
Form ID 0x1036
Records 34
Path Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 4
Record 3378
PCI Express Root Port 4 Firmware Value
Control the PCI Express Root Port.
Opcode OneOf
Question ID 0xc6c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x102
Width 1 byte(s)
Range 0 to 1 step 0 Permalink
Record 3379
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 0xc6d
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x36a
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} {"condition_id": 1526, "type": "GrayOutIf", "offset": 479044, "expr": ["EqIdVal QuestionId: 0xC7A, Value: 0x1"]} Permalink
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 0x15e3
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x11e
Width 1 byte(s)
Range 0 to 4 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
PCI Express L1 Substates settings.
Opcode OneOf
Question ID 0x15ff
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2c2
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
PCI Express L1 Low Substate Enable/Disable.
Opcode OneOf
Question ID 0xc6e
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2de
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
Enable/Disable Access Control Services Extended Capability
Opcode OneOf
Question ID 0xc6f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2fa
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
Enable/Disable Precision Time Measurement
Opcode OneOf
Question ID 0x161b
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x316
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
Enable/Disable Downstream Port Containment
Opcode OneOf
Question ID 0xc70
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x332
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
Enable/Disable Rootport extensions for Downstream Port Containment
Opcode OneOf
Question ID 0xc71
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x34e
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
PCI Express Unsupported Request Reporting Enable/Disable.
Opcode OneOf
Question ID 0xc72
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x13a
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
PCI Express Device Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xc73
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x156
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
PCI Express Device Non-Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xc74
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x172
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
PCI Express Device Correctable Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xc75
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x18e
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
Root PCI Express System Error on Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xc76
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1e2
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
Root PCI Express System Error on Non-Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xc77
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1fe
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
Root PCI Express System Error on Correctable Error Enable/Disable.
Opcode OneOf
Question ID 0xc78
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x21a
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
PCI Express PME SCI Enable/Disable.
Opcode OneOf
Question ID 0xc79
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x236
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
PCI Express Hot Plug Enable/Disable.
Opcode OneOf
Question ID 0xc7a
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x252
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} {"condition_id": 1527, "type": "GrayOutIf", "offset": 479596, "expr": ["EqIdVal QuestionId: 0xC6D, Value: 0x0"]} Permalink
Record 3396
Advanced Error Reporting Firmware Value
Advanced Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xc7b
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x26e
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
Configure PCIe Speed
Opcode OneOf
Question ID 0xc7c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x28a
Width 1 byte(s)
Range 0 to 3 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
Record 3398
Transmitter Half Swing Firmware Value
Transmitter Half Swing Enable/Disable.
Opcode OneOf
Question ID 0xc7d
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2a6
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
Record 3399
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 0xc7e
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x389
Width 2 byte(s)
Range 0 to 65535 step 1 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
Record 3400
Extra Bus Reserved Firmware Value
Extra Bus Reserved (0-7) for bridges behind this Root Bridge.
Opcode Numeric
Question ID 0xc7f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x522
Width 1 byte(s)
Range 0 to 7 step 1 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
Record 3401
Reserved Memory Firmware Value
Reserved Memory for this Root Bridge (1-20) MB
Opcode Numeric
Question ID 0xc80
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x541
Width 2 byte(s)
Range 1 to 20 step 1 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
Reserved I/O (4K/8K/12K/16K/20K) Range for this Root Bridge.
Opcode Numeric
Question ID 0xc81
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x576
Width 1 byte(s)
Range 4 to 20 step 4 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
PCH PCIE Latency Reporting Enable/Disable
Opcode OneOf
Question ID 0xc82
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3e6
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
Record 3404
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 0xc83
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x41e
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} {"condition_id": 1528, "type": "SuppressIf", "offset": 479911, "expr": ["EqIdVal QuestionId: 0xC82, Value: 0x0"]} Permalink
Record 3405
Snoop Latency Value Firmware Value
LTR Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xc84
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x491
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} {"condition_id": 1528, "type": "SuppressIf", "offset": 479911, "expr": ["EqIdVal QuestionId: 0xC82, Value: 0x0"]} {"condition_id": 1529, "type": "SuppressIf", "offset": 479959, "expr": ["EqIdVal QuestionId: 0xC83, Value: 0x1", "Not"]} Permalink
Record 3406
Snoop Latency Multiplier Firmware Value
LTR Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xc85
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x43a
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} {"condition_id": 1528, "type": "SuppressIf", "offset": 479911, "expr": ["EqIdVal QuestionId: 0xC82, Value: 0x0"]} {"condition_id": 1529, "type": "SuppressIf", "offset": 479959, "expr": ["EqIdVal QuestionId: 0xC83, Value: 0x1", "Not"]} Permalink
Record 3407
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 0xc86
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x456
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} {"condition_id": 1528, "type": "SuppressIf", "offset": 479911, "expr": ["EqIdVal QuestionId: 0xC82, Value: 0x0"]} Permalink
Record 3408
Non Snoop Latency Value Firmware Value
LTR Non Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xc87
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4c9
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} {"condition_id": 1528, "type": "SuppressIf", "offset": 479911, "expr": ["EqIdVal QuestionId: 0xC82, Value: 0x0"]} {"condition_id": 1530, "type": "SuppressIf", "offset": 480103, "expr": ["EqIdVal QuestionId: 0xC86, Value: 0x1", "Not"]} Permalink
Record 3409
Non Snoop Latency Multiplier Firmware Value
LTR Non Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xc88
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x472
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} {"condition_id": 1528, "type": "SuppressIf", "offset": 479911, "expr": ["EqIdVal QuestionId: 0xC82, Value: 0x0"]} {"condition_id": 1530, "type": "SuppressIf", "offset": 480103, "expr": ["EqIdVal QuestionId: 0xC86, Value: 0x1", "Not"]} Permalink
PCIE LTR Configuration Lock
Opcode OneOf
Question ID 0xc89
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x402
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink
Record 3411
Peer Memory Write Enable Firmware Value
Peer Memory Write Enable/Disable
Opcode OneOf
Question ID 0xc8a
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0xc1
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1525, "type": "SuppressIf", "offset": 479036, "expr": ["EqIdVal QuestionId: 0xC6C, Value: 0x0"]} Permalink