Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026
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Overview / Manual / PCI Express Root Port 24
PCIe and Graphics
PCI Express Root Port 24
PCI Express Root Port 24 firmware setup page decoded from AMI HII/IFR resources.
Form ID 0x157f
Records 34
Path Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 24
Record 4058
PCI Express Root Port 24 Firmware Value
Control the PCI Express Root Port.
Opcode OneOf
Question ID 0xed8
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x116
Width 1 byte(s)
Range 0 to 1 step 0 Permalink
Record 4059
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 0xed9
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x37e
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} {"condition_id": 1646, "type": "GrayOutIf", "offset": 504864, "expr": ["EqIdVal QuestionId: 0xEE6, 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 0x15f7
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x132
Width 1 byte(s)
Range 0 to 4 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
PCI Express L1 Substates settings.
Opcode OneOf
Question ID 0x1613
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2d6
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
PCI Express L1 Low Substate Enable/Disable.
Opcode OneOf
Question ID 0xeda
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2f2
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
Enable/Disable Access Control Services Extended Capability
Opcode OneOf
Question ID 0xedb
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x30e
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
Enable/Disable Precision Time Measurement
Opcode OneOf
Question ID 0x162f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x32a
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
Enable/Disable Downstream Port Containment
Opcode OneOf
Question ID 0xedc
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x346
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
Enable/Disable Rootport extensions for Downstream Port Containment
Opcode OneOf
Question ID 0xedd
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x362
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
PCI Express Unsupported Request Reporting Enable/Disable.
Opcode OneOf
Question ID 0xede
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x14e
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
PCI Express Device Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xedf
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x16a
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
PCI Express Device Non-Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xee0
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x186
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
PCI Express Device Correctable Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xee1
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1a2
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
Root PCI Express System Error on Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xee2
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1f6
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
Root PCI Express System Error on Non-Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xee3
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x212
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
Root PCI Express System Error on Correctable Error Enable/Disable.
Opcode OneOf
Question ID 0xee4
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x22e
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
PCI Express PME SCI Enable/Disable.
Opcode OneOf
Question ID 0xee5
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x24a
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
PCI Express Hot Plug Enable/Disable.
Opcode OneOf
Question ID 0xee6
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x266
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} {"condition_id": 1647, "type": "GrayOutIf", "offset": 505416, "expr": ["EqIdVal QuestionId: 0xED9, Value: 0x0"]} Permalink
Record 4076
Advanced Error Reporting Firmware Value
Advanced Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xee7
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x282
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
Configure PCIe Speed
Opcode OneOf
Question ID 0xee8
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x29e
Width 1 byte(s)
Range 0 to 3 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
Record 4078
Transmitter Half Swing Firmware Value
Transmitter Half Swing Enable/Disable.
Opcode OneOf
Question ID 0xee9
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2ba
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
Record 4079
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 0xeea
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3b1
Width 2 byte(s)
Range 0 to 65535 step 1 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
Record 4080
Extra Bus Reserved Firmware Value
Extra Bus Reserved (0-7) for bridges behind this Root Bridge.
Opcode Numeric
Question ID 0xeeb
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x536
Width 1 byte(s)
Range 0 to 7 step 1 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
Record 4081
Reserved Memory Firmware Value
Reserved Memory for this Root Bridge (1-20) MB
Opcode Numeric
Question ID 0xeec
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x569
Width 2 byte(s)
Range 1 to 20 step 1 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
Reserved I/O (4K/8K/12K/16K/20K) Range for this Root Bridge.
Opcode Numeric
Question ID 0xeed
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x58a
Width 1 byte(s)
Range 4 to 20 step 4 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
PCH PCIE Latency Reporting Enable/Disable
Opcode OneOf
Question ID 0xeee
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3fa
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
Record 4084
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 0xeef
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x432
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} {"condition_id": 1648, "type": "SuppressIf", "offset": 505731, "expr": ["EqIdVal QuestionId: 0xEEE, Value: 0x0"]} Permalink
Record 4085
Snoop Latency Value Firmware Value
LTR Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xef0
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4b9
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} {"condition_id": 1648, "type": "SuppressIf", "offset": 505731, "expr": ["EqIdVal QuestionId: 0xEEE, Value: 0x0"]} {"condition_id": 1649, "type": "SuppressIf", "offset": 505779, "expr": ["EqIdVal QuestionId: 0xEEF, Value: 0x1", "Not"]} Permalink
Record 4086
Snoop Latency Multiplier Firmware Value
LTR Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xef1
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x44e
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} {"condition_id": 1648, "type": "SuppressIf", "offset": 505731, "expr": ["EqIdVal QuestionId: 0xEEE, Value: 0x0"]} {"condition_id": 1649, "type": "SuppressIf", "offset": 505779, "expr": ["EqIdVal QuestionId: 0xEEF, Value: 0x1", "Not"]} Permalink
Record 4087
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 0xef2
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x46a
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} {"condition_id": 1648, "type": "SuppressIf", "offset": 505731, "expr": ["EqIdVal QuestionId: 0xEEE, Value: 0x0"]} Permalink
Record 4088
Non Snoop Latency Value Firmware Value
LTR Non Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xef3
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4f1
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} {"condition_id": 1648, "type": "SuppressIf", "offset": 505731, "expr": ["EqIdVal QuestionId: 0xEEE, Value: 0x0"]} {"condition_id": 1650, "type": "SuppressIf", "offset": 505923, "expr": ["EqIdVal QuestionId: 0xEF2, Value: 0x1", "Not"]} Permalink
Record 4089
Non Snoop Latency Multiplier Firmware Value
LTR Non Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xef4
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x486
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} {"condition_id": 1648, "type": "SuppressIf", "offset": 505731, "expr": ["EqIdVal QuestionId: 0xEEE, Value: 0x0"]} {"condition_id": 1650, "type": "SuppressIf", "offset": 505923, "expr": ["EqIdVal QuestionId: 0xEF2, Value: 0x1", "Not"]} Permalink
PCIE LTR Configuration Lock
Opcode OneOf
Question ID 0xef5
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x416
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink
Record 4091
Peer Memory Write Enable Firmware Value
Peer Memory Write Enable/Disable
Opcode OneOf
Question ID 0xef6
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0xd5
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]} Permalink