Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026
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Overview / Manual / PCI Express Root Port 25
PCIe and Graphics
PCI Express Root Port 25
PCI Express Root Port 25 firmware setup page decoded from AMI HII/IFR resources.
Form ID 0x1587
Records 34
Path Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 25
Record 4092
PCI Express Root Port 25 Firmware Value
Control the PCI Express Root Port.
Opcode OneOf
Question ID 0xef7
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x117
Width 1 byte(s)
Range 0 to 1 step 0 Permalink
Record 4093
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 0xef8
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x37f
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} {"condition_id": 1652, "type": "GrayOutIf", "offset": 506155, "expr": ["EqIdVal QuestionId: 0xF05, 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 0x15f8
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x133
Width 1 byte(s)
Range 0 to 4 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
PCI Express L1 Substates settings.
Opcode OneOf
Question ID 0x1614
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2d7
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
PCI Express L1 Low Substate Enable/Disable.
Opcode OneOf
Question ID 0xef9
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2f3
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
Enable/Disable Access Control Services Extended Capability
Opcode OneOf
Question ID 0xefa
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x30f
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
Enable/Disable Precision Time Measurement
Opcode OneOf
Question ID 0x1630
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x32b
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
Enable/Disable Downstream Port Containment
Opcode OneOf
Question ID 0xefb
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x347
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
Enable/Disable Rootport extensions for Downstream Port Containment
Opcode OneOf
Question ID 0xefc
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x363
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
PCI Express Unsupported Request Reporting Enable/Disable.
Opcode OneOf
Question ID 0xefd
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x14f
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
PCI Express Device Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xefe
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x16b
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
PCI Express Device Non-Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xeff
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x187
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
PCI Express Device Correctable Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xf00
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1a3
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
Root PCI Express System Error on Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xf01
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1f7
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
Root PCI Express System Error on Non-Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xf02
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x213
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
Root PCI Express System Error on Correctable Error Enable/Disable.
Opcode OneOf
Question ID 0xf03
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x22f
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
PCI Express PME SCI Enable/Disable.
Opcode OneOf
Question ID 0xf04
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x24b
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
PCI Express Hot Plug Enable/Disable.
Opcode OneOf
Question ID 0xf05
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x267
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} {"condition_id": 1653, "type": "GrayOutIf", "offset": 506707, "expr": ["EqIdVal QuestionId: 0xEF8, Value: 0x0"]} Permalink
Record 4110
Advanced Error Reporting Firmware Value
Advanced Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xf06
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x283
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
Configure PCIe Speed
Opcode OneOf
Question ID 0xf07
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x29f
Width 1 byte(s)
Range 0 to 3 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
Record 4112
Transmitter Half Swing Firmware Value
Transmitter Half Swing Enable/Disable.
Opcode OneOf
Question ID 0xf08
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2bb
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
Record 4113
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 0xf09
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3b3
Width 2 byte(s)
Range 0 to 65535 step 1 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
Record 4114
Extra Bus Reserved Firmware Value
Extra Bus Reserved (0-7) for bridges behind this Root Bridge.
Opcode Numeric
Question ID 0xf0a
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x537
Width 1 byte(s)
Range 0 to 7 step 1 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
Record 4115
Reserved Memory Firmware Value
Reserved Memory for this Root Bridge (1-20) MB
Opcode Numeric
Question ID 0xf0b
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x56b
Width 2 byte(s)
Range 1 to 20 step 1 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
Reserved I/O (4K/8K/12K/16K/20K) Range for this Root Bridge.
Opcode Numeric
Question ID 0xf0c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x58b
Width 1 byte(s)
Range 4 to 20 step 4 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
PCH PCIE Latency Reporting Enable/Disable
Opcode OneOf
Question ID 0xf0d
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3fb
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
Record 4118
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 0xf0e
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x433
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} {"condition_id": 1654, "type": "SuppressIf", "offset": 507022, "expr": ["EqIdVal QuestionId: 0xF0D, Value: 0x0"]} Permalink
Record 4119
Snoop Latency Value Firmware Value
LTR Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xf0f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4bb
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} {"condition_id": 1654, "type": "SuppressIf", "offset": 507022, "expr": ["EqIdVal QuestionId: 0xF0D, Value: 0x0"]} {"condition_id": 1655, "type": "SuppressIf", "offset": 507070, "expr": ["EqIdVal QuestionId: 0xF0E, Value: 0x1", "Not"]} Permalink
Record 4120
Snoop Latency Multiplier Firmware Value
LTR Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xf10
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x44f
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} {"condition_id": 1654, "type": "SuppressIf", "offset": 507022, "expr": ["EqIdVal QuestionId: 0xF0D, Value: 0x0"]} {"condition_id": 1655, "type": "SuppressIf", "offset": 507070, "expr": ["EqIdVal QuestionId: 0xF0E, Value: 0x1", "Not"]} Permalink
Record 4121
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 0xf11
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x46b
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} {"condition_id": 1654, "type": "SuppressIf", "offset": 507022, "expr": ["EqIdVal QuestionId: 0xF0D, Value: 0x0"]} Permalink
Record 4122
Non Snoop Latency Value Firmware Value
LTR Non Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xf12
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4f3
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} {"condition_id": 1654, "type": "SuppressIf", "offset": 507022, "expr": ["EqIdVal QuestionId: 0xF0D, Value: 0x0"]} {"condition_id": 1656, "type": "SuppressIf", "offset": 507214, "expr": ["EqIdVal QuestionId: 0xF11, Value: 0x1", "Not"]} Permalink
Record 4123
Non Snoop Latency Multiplier Firmware Value
LTR Non Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xf13
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x487
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} {"condition_id": 1654, "type": "SuppressIf", "offset": 507022, "expr": ["EqIdVal QuestionId: 0xF0D, Value: 0x0"]} {"condition_id": 1656, "type": "SuppressIf", "offset": 507214, "expr": ["EqIdVal QuestionId: 0xF11, Value: 0x1", "Not"]} Permalink
PCIE LTR Configuration Lock
Opcode OneOf
Question ID 0xf14
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x417
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink
Record 4125
Peer Memory Write Enable Firmware Value
Peer Memory Write Enable/Disable
Opcode OneOf
Question ID 0xf15
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0xd6
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1651, "type": "SuppressIf", "offset": 506147, "expr": ["EqIdVal QuestionId: 0xEF7, Value: 0x0"]} Permalink