Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026
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Overview / Manual / PCI Express Root Port 2
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 Permalink
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 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"]} 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 0x15e1
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x11c
Width 1 byte(s)
Range 0 to 4 step 0 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 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"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 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"]} Permalink
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 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"]} Permalink
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 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"]} Permalink
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 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"]} Permalink
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 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"]} Permalink
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 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"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1513, "type": "SuppressIf", "offset": 476454, "expr": ["EqIdVal QuestionId: 0xC2E, Value: 0x0"]} Permalink