Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026
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Overview / Manual / PCI Express Root Port 5
PCIe and Graphics
PCI Express Root Port 5
PCI Express Root Port 5 firmware setup page decoded from AMI HII/IFR resources.
Form ID 0x1037
Records 34
Path Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 5
Record 3412
PCI Express Root Port 5 Firmware Value
Control the PCI Express Root Port.
Opcode OneOf
Question ID 0xc8b
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x103
Width 1 byte(s)
Range 0 to 1 step 0 Permalink
Record 3413
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 0xc8c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x36b
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} {"condition_id": 1532, "type": "GrayOutIf", "offset": 480335, "expr": ["EqIdVal QuestionId: 0xC99, 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 0x15e4
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x11f
Width 1 byte(s)
Range 0 to 4 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
PCI Express L1 Substates settings.
Opcode OneOf
Question ID 0x1600
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2c3
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
PCI Express L1 Low Substate Enable/Disable.
Opcode OneOf
Question ID 0xc8d
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2df
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
Enable/Disable Access Control Services Extended Capability
Opcode OneOf
Question ID 0xc8e
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2fb
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
Enable/Disable Precision Time Measurement
Opcode OneOf
Question ID 0x161c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x317
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
Enable/Disable Downstream Port Containment
Opcode OneOf
Question ID 0xc8f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x333
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
Enable/Disable Rootport extensions for Downstream Port Containment
Opcode OneOf
Question ID 0xc90
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x34f
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
PCI Express Unsupported Request Reporting Enable/Disable.
Opcode OneOf
Question ID 0xc91
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x13b
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
PCI Express Device Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xc92
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x157
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
PCI Express Device Non-Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xc93
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x173
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
PCI Express Device Correctable Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xc94
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x18f
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
Root PCI Express System Error on Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xc95
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1e3
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
Root PCI Express System Error on Non-Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xc96
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1ff
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
Root PCI Express System Error on Correctable Error Enable/Disable.
Opcode OneOf
Question ID 0xc97
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x21b
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
PCI Express PME SCI Enable/Disable.
Opcode OneOf
Question ID 0xc98
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x237
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
PCI Express Hot Plug Enable/Disable.
Opcode OneOf
Question ID 0xc99
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x253
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} {"condition_id": 1533, "type": "GrayOutIf", "offset": 480887, "expr": ["EqIdVal QuestionId: 0xC8C, Value: 0x0"]} Permalink
Record 3430
Advanced Error Reporting Firmware Value
Advanced Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xc9a
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x26f
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
Configure PCIe Speed
Opcode OneOf
Question ID 0xc9b
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x28b
Width 1 byte(s)
Range 0 to 3 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
Record 3432
Transmitter Half Swing Firmware Value
Transmitter Half Swing Enable/Disable.
Opcode OneOf
Question ID 0xc9c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2a7
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
Record 3433
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 0xc9d
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x38b
Width 2 byte(s)
Range 0 to 65535 step 1 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
Record 3434
Extra Bus Reserved Firmware Value
Extra Bus Reserved (0-7) for bridges behind this Root Bridge.
Opcode Numeric
Question ID 0xc9e
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x523
Width 1 byte(s)
Range 0 to 7 step 1 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
Record 3435
Reserved Memory Firmware Value
Reserved Memory for this Root Bridge (1-20) MB
Opcode Numeric
Question ID 0xc9f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x543
Width 2 byte(s)
Range 1 to 20 step 1 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
Reserved I/O (4K/8K/12K/16K/20K) Range for this Root Bridge.
Opcode Numeric
Question ID 0xca0
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x577
Width 1 byte(s)
Range 4 to 20 step 4 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
PCH PCIE Latency Reporting Enable/Disable
Opcode OneOf
Question ID 0xca1
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3e7
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
Record 3438
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 0xca2
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x41f
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} {"condition_id": 1534, "type": "SuppressIf", "offset": 481202, "expr": ["EqIdVal QuestionId: 0xCA1, Value: 0x0"]} Permalink
Record 3439
Snoop Latency Value Firmware Value
LTR Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xca3
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x493
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} {"condition_id": 1534, "type": "SuppressIf", "offset": 481202, "expr": ["EqIdVal QuestionId: 0xCA1, Value: 0x0"]} {"condition_id": 1535, "type": "SuppressIf", "offset": 481250, "expr": ["EqIdVal QuestionId: 0xCA2, Value: 0x1", "Not"]} Permalink
Record 3440
Snoop Latency Multiplier Firmware Value
LTR Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xca4
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x43b
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} {"condition_id": 1534, "type": "SuppressIf", "offset": 481202, "expr": ["EqIdVal QuestionId: 0xCA1, Value: 0x0"]} {"condition_id": 1535, "type": "SuppressIf", "offset": 481250, "expr": ["EqIdVal QuestionId: 0xCA2, Value: 0x1", "Not"]} Permalink
Record 3441
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 0xca5
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x457
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} {"condition_id": 1534, "type": "SuppressIf", "offset": 481202, "expr": ["EqIdVal QuestionId: 0xCA1, Value: 0x0"]} Permalink
Record 3442
Non Snoop Latency Value Firmware Value
LTR Non Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xca6
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4cb
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} {"condition_id": 1534, "type": "SuppressIf", "offset": 481202, "expr": ["EqIdVal QuestionId: 0xCA1, Value: 0x0"]} {"condition_id": 1536, "type": "SuppressIf", "offset": 481394, "expr": ["EqIdVal QuestionId: 0xCA5, Value: 0x1", "Not"]} Permalink
Record 3443
Non Snoop Latency Multiplier Firmware Value
LTR Non Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xca7
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x473
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} {"condition_id": 1534, "type": "SuppressIf", "offset": 481202, "expr": ["EqIdVal QuestionId: 0xCA1, Value: 0x0"]} {"condition_id": 1536, "type": "SuppressIf", "offset": 481394, "expr": ["EqIdVal QuestionId: 0xCA5, Value: 0x1", "Not"]} Permalink
PCIE LTR Configuration Lock
Opcode OneOf
Question ID 0xca8
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x403
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink
Record 3445
Peer Memory Write Enable Firmware Value
Peer Memory Write Enable/Disable
Opcode OneOf
Question ID 0xca9
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0xc2
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]} Permalink