Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026
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Overview / Manual / PCI Express Root Port 26
PCIe and Graphics
PCI Express Root Port 26
PCI Express Root Port 26 firmware setup page decoded from AMI HII/IFR resources.
Form ID 0x1588
Records 34
Path Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 26
Record 4126
PCI Express Root Port 26 Firmware Value
Control the PCI Express Root Port.
Opcode OneOf
Question ID 0xf16
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x118
Width 1 byte(s)
Range 0 to 1 step 0 Permalink
Record 4127
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 0xf17
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x380
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} {"condition_id": 1658, "type": "GrayOutIf", "offset": 507446, "expr": ["EqIdVal QuestionId: 0xF24, 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 0x15f9
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x134
Width 1 byte(s)
Range 0 to 4 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
PCI Express L1 Substates settings.
Opcode OneOf
Question ID 0x1615
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2d8
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
PCI Express L1 Low Substate Enable/Disable.
Opcode OneOf
Question ID 0xf18
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2f4
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
Enable/Disable Access Control Services Extended Capability
Opcode OneOf
Question ID 0xf19
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x310
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
Enable/Disable Precision Time Measurement
Opcode OneOf
Question ID 0x1631
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x32c
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
Enable/Disable Downstream Port Containment
Opcode OneOf
Question ID 0xf1a
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x348
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
Enable/Disable Rootport extensions for Downstream Port Containment
Opcode OneOf
Question ID 0xf1b
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x364
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
PCI Express Unsupported Request Reporting Enable/Disable.
Opcode OneOf
Question ID 0xf1c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x150
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
PCI Express Device Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xf1d
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x16c
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
PCI Express Device Non-Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xf1e
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x188
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
PCI Express Device Correctable Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xf1f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1a4
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
Root PCI Express System Error on Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xf20
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1f8
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
Root PCI Express System Error on Non-Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xf21
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x214
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
Root PCI Express System Error on Correctable Error Enable/Disable.
Opcode OneOf
Question ID 0xf22
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x230
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
PCI Express PME SCI Enable/Disable.
Opcode OneOf
Question ID 0xf23
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x24c
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
PCI Express Hot Plug Enable/Disable.
Opcode OneOf
Question ID 0xf24
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x268
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} {"condition_id": 1659, "type": "GrayOutIf", "offset": 507998, "expr": ["EqIdVal QuestionId: 0xF17, Value: 0x0"]} Permalink
Record 4144
Advanced Error Reporting Firmware Value
Advanced Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xf25
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x284
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
Configure PCIe Speed
Opcode OneOf
Question ID 0xf26
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2a0
Width 1 byte(s)
Range 0 to 3 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
Record 4146
Transmitter Half Swing Firmware Value
Transmitter Half Swing Enable/Disable.
Opcode OneOf
Question ID 0xf27
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2bc
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
Record 4147
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 0xf28
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3b5
Width 2 byte(s)
Range 0 to 65535 step 1 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
Record 4148
Extra Bus Reserved Firmware Value
Extra Bus Reserved (0-7) for bridges behind this Root Bridge.
Opcode Numeric
Question ID 0xf29
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x538
Width 1 byte(s)
Range 0 to 7 step 1 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
Record 4149
Reserved Memory Firmware Value
Reserved Memory for this Root Bridge (1-20) MB
Opcode Numeric
Question ID 0xf2a
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x56d
Width 2 byte(s)
Range 1 to 20 step 1 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
Reserved I/O (4K/8K/12K/16K/20K) Range for this Root Bridge.
Opcode Numeric
Question ID 0xf2b
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x58c
Width 1 byte(s)
Range 4 to 20 step 4 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
PCH PCIE Latency Reporting Enable/Disable
Opcode OneOf
Question ID 0xf2c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3fc
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
Record 4152
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 0xf2d
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x434
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} {"condition_id": 1660, "type": "SuppressIf", "offset": 508313, "expr": ["EqIdVal QuestionId: 0xF2C, Value: 0x0"]} Permalink
Record 4153
Snoop Latency Value Firmware Value
LTR Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xf2e
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4bd
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} {"condition_id": 1660, "type": "SuppressIf", "offset": 508313, "expr": ["EqIdVal QuestionId: 0xF2C, Value: 0x0"]} {"condition_id": 1661, "type": "SuppressIf", "offset": 508361, "expr": ["EqIdVal QuestionId: 0xF2D, Value: 0x1", "Not"]} Permalink
Record 4154
Snoop Latency Multiplier Firmware Value
LTR Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xf2f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x450
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} {"condition_id": 1660, "type": "SuppressIf", "offset": 508313, "expr": ["EqIdVal QuestionId: 0xF2C, Value: 0x0"]} {"condition_id": 1661, "type": "SuppressIf", "offset": 508361, "expr": ["EqIdVal QuestionId: 0xF2D, Value: 0x1", "Not"]} Permalink
Record 4155
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 0xf30
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x46c
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} {"condition_id": 1660, "type": "SuppressIf", "offset": 508313, "expr": ["EqIdVal QuestionId: 0xF2C, Value: 0x0"]} Permalink
Record 4156
Non Snoop Latency Value Firmware Value
LTR Non Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xf31
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4f5
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} {"condition_id": 1660, "type": "SuppressIf", "offset": 508313, "expr": ["EqIdVal QuestionId: 0xF2C, Value: 0x0"]} {"condition_id": 1662, "type": "SuppressIf", "offset": 508505, "expr": ["EqIdVal QuestionId: 0xF30, Value: 0x1", "Not"]} Permalink
Record 4157
Non Snoop Latency Multiplier Firmware Value
LTR Non Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xf32
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x488
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} {"condition_id": 1660, "type": "SuppressIf", "offset": 508313, "expr": ["EqIdVal QuestionId: 0xF2C, Value: 0x0"]} {"condition_id": 1662, "type": "SuppressIf", "offset": 508505, "expr": ["EqIdVal QuestionId: 0xF30, Value: 0x1", "Not"]} Permalink
PCIE LTR Configuration Lock
Opcode OneOf
Question ID 0xf33
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x418
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink
Record 4159
Peer Memory Write Enable Firmware Value
Peer Memory Write Enable/Disable
Opcode OneOf
Question ID 0xf34
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0xd7
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]} Permalink