Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026
System Dark Light
Overview / Manual / PCI Express Root Port 28
PCIe and Graphics
PCI Express Root Port 28
PCI Express Root Port 28 firmware setup page decoded from AMI HII/IFR resources.
Form ID 0x158a
Records 34
Path Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 28
Record 4194
PCI Express Root Port 28 Firmware Value
Control the PCI Express Root Port.
Opcode OneOf
Question ID 0xf54
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x11a
Width 1 byte(s)
Range 0 to 1 step 0 Permalink
Record 4195
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 0xf55
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x382
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} {"condition_id": 1670, "type": "GrayOutIf", "offset": 510028, "expr": ["EqIdVal QuestionId: 0xF62, 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 0x15fb
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x136
Width 1 byte(s)
Range 0 to 4 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
PCI Express L1 Substates settings.
Opcode OneOf
Question ID 0x1617
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2da
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
PCI Express L1 Low Substate Enable/Disable.
Opcode OneOf
Question ID 0xf56
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2f6
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
Enable/Disable Access Control Services Extended Capability
Opcode OneOf
Question ID 0xf57
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x312
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
Enable/Disable Precision Time Measurement
Opcode OneOf
Question ID 0x1633
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x32e
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
Enable/Disable Downstream Port Containment
Opcode OneOf
Question ID 0xf58
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x34a
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
Enable/Disable Rootport extensions for Downstream Port Containment
Opcode OneOf
Question ID 0xf59
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x366
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
PCI Express Unsupported Request Reporting Enable/Disable.
Opcode OneOf
Question ID 0xf5a
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x152
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
PCI Express Device Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xf5b
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x16e
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
PCI Express Device Non-Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xf5c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x18a
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
PCI Express Device Correctable Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xf5d
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1a6
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
Root PCI Express System Error on Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xf5e
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1fa
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
Root PCI Express System Error on Non-Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xf5f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x216
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
Root PCI Express System Error on Correctable Error Enable/Disable.
Opcode OneOf
Question ID 0xf60
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x232
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
PCI Express PME SCI Enable/Disable.
Opcode OneOf
Question ID 0xf61
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x24e
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
PCI Express Hot Plug Enable/Disable.
Opcode OneOf
Question ID 0xf62
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x26a
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} {"condition_id": 1671, "type": "GrayOutIf", "offset": 510580, "expr": ["EqIdVal QuestionId: 0xF55, Value: 0x0"]} Permalink
Record 4212
Advanced Error Reporting Firmware Value
Advanced Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xf63
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x286
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
Configure PCIe Speed
Opcode OneOf
Question ID 0xf64
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2a2
Width 1 byte(s)
Range 0 to 3 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
Record 4214
Transmitter Half Swing Firmware Value
Transmitter Half Swing Enable/Disable.
Opcode OneOf
Question ID 0xf65
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2be
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
Record 4215
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 0xf66
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3b9
Width 2 byte(s)
Range 0 to 65535 step 1 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
Record 4216
Extra Bus Reserved Firmware Value
Extra Bus Reserved (0-7) for bridges behind this Root Bridge.
Opcode Numeric
Question ID 0xf67
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x53a
Width 1 byte(s)
Range 0 to 7 step 1 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
Record 4217
Reserved Memory Firmware Value
Reserved Memory for this Root Bridge (1-20) MB
Opcode Numeric
Question ID 0xf68
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x571
Width 2 byte(s)
Range 1 to 20 step 1 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
Reserved I/O (4K/8K/12K/16K/20K) Range for this Root Bridge.
Opcode Numeric
Question ID 0xf69
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x58e
Width 1 byte(s)
Range 4 to 20 step 4 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
PCH PCIE Latency Reporting Enable/Disable
Opcode OneOf
Question ID 0xf6a
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3fe
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
Record 4220
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 0xf6b
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x436
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} {"condition_id": 1672, "type": "SuppressIf", "offset": 510895, "expr": ["EqIdVal QuestionId: 0xF6A, Value: 0x0"]} Permalink
Record 4221
Snoop Latency Value Firmware Value
LTR Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xf6c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4c1
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} {"condition_id": 1672, "type": "SuppressIf", "offset": 510895, "expr": ["EqIdVal QuestionId: 0xF6A, Value: 0x0"]} {"condition_id": 1673, "type": "SuppressIf", "offset": 510943, "expr": ["EqIdVal QuestionId: 0xF6B, Value: 0x1", "Not"]} Permalink
Record 4222
Snoop Latency Multiplier Firmware Value
LTR Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xf6d
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x452
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} {"condition_id": 1672, "type": "SuppressIf", "offset": 510895, "expr": ["EqIdVal QuestionId: 0xF6A, Value: 0x0"]} {"condition_id": 1673, "type": "SuppressIf", "offset": 510943, "expr": ["EqIdVal QuestionId: 0xF6B, Value: 0x1", "Not"]} Permalink
Record 4223
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 0xf6e
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x46e
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} {"condition_id": 1672, "type": "SuppressIf", "offset": 510895, "expr": ["EqIdVal QuestionId: 0xF6A, Value: 0x0"]} Permalink
Record 4224
Non Snoop Latency Value Firmware Value
LTR Non Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xf6f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4f9
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} {"condition_id": 1672, "type": "SuppressIf", "offset": 510895, "expr": ["EqIdVal QuestionId: 0xF6A, Value: 0x0"]} {"condition_id": 1674, "type": "SuppressIf", "offset": 511087, "expr": ["EqIdVal QuestionId: 0xF6E, Value: 0x1", "Not"]} Permalink
Record 4225
Non Snoop Latency Multiplier Firmware Value
LTR Non Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xf70
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x48a
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} {"condition_id": 1672, "type": "SuppressIf", "offset": 510895, "expr": ["EqIdVal QuestionId: 0xF6A, Value: 0x0"]} {"condition_id": 1674, "type": "SuppressIf", "offset": 511087, "expr": ["EqIdVal QuestionId: 0xF6E, Value: 0x1", "Not"]} Permalink
PCIE LTR Configuration Lock
Opcode OneOf
Question ID 0xf71
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x41a
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink
Record 4227
Peer Memory Write Enable Firmware Value
Peer Memory Write Enable/Disable
Opcode OneOf
Question ID 0xf72
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0xd9
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1669, "type": "SuppressIf", "offset": 510020, "expr": ["EqIdVal QuestionId: 0xF54, Value: 0x0"]} Permalink