Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026
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Overview / Manual / PCI Express Root Port 23
PCIe and Graphics
PCI Express Root Port 23
PCI Express Root Port 23 firmware setup page decoded from AMI HII/IFR resources.
Form ID 0x157e
Records 34
Path Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 23
Record 4024
PCI Express Root Port 23 Firmware Value
Control the PCI Express Root Port.
Opcode OneOf
Question ID 0xeb9
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x115
Width 1 byte(s)
Range 0 to 1 step 0 Permalink
Record 4025
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 0xeba
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x37d
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} {"condition_id": 1640, "type": "GrayOutIf", "offset": 503573, "expr": ["EqIdVal QuestionId: 0xEC7, 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 0x15f6
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x131
Width 1 byte(s)
Range 0 to 4 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
PCI Express L1 Substates settings.
Opcode OneOf
Question ID 0x1612
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2d5
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
PCI Express L1 Low Substate Enable/Disable.
Opcode OneOf
Question ID 0xebb
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2f1
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
Enable/Disable Access Control Services Extended Capability
Opcode OneOf
Question ID 0xebc
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x30d
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
Enable/Disable Precision Time Measurement
Opcode OneOf
Question ID 0x162e
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x329
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
Enable/Disable Downstream Port Containment
Opcode OneOf
Question ID 0xebd
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x345
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
Enable/Disable Rootport extensions for Downstream Port Containment
Opcode OneOf
Question ID 0xebe
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x361
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
PCI Express Unsupported Request Reporting Enable/Disable.
Opcode OneOf
Question ID 0xebf
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x14d
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
PCI Express Device Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xec0
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x169
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
PCI Express Device Non-Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xec1
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x185
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
PCI Express Device Correctable Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xec2
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1a1
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
Root PCI Express System Error on Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xec3
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1f5
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
Root PCI Express System Error on Non-Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xec4
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x211
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
Root PCI Express System Error on Correctable Error Enable/Disable.
Opcode OneOf
Question ID 0xec5
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x22d
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
PCI Express PME SCI Enable/Disable.
Opcode OneOf
Question ID 0xec6
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x249
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
PCI Express Hot Plug Enable/Disable.
Opcode OneOf
Question ID 0xec7
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x265
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} {"condition_id": 1641, "type": "GrayOutIf", "offset": 504125, "expr": ["EqIdVal QuestionId: 0xEBA, Value: 0x0"]} Permalink
Record 4042
Advanced Error Reporting Firmware Value
Advanced Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xec8
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x281
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
Configure PCIe Speed
Opcode OneOf
Question ID 0xec9
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x29d
Width 1 byte(s)
Range 0 to 3 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
Record 4044
Transmitter Half Swing Firmware Value
Transmitter Half Swing Enable/Disable.
Opcode OneOf
Question ID 0xeca
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2b9
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
Record 4045
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 0xecb
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3af
Width 2 byte(s)
Range 0 to 65535 step 1 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
Record 4046
Extra Bus Reserved Firmware Value
Extra Bus Reserved (0-7) for bridges behind this Root Bridge.
Opcode Numeric
Question ID 0xecc
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x535
Width 1 byte(s)
Range 0 to 7 step 1 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
Record 4047
Reserved Memory Firmware Value
Reserved Memory for this Root Bridge (1-20) MB
Opcode Numeric
Question ID 0xecd
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x567
Width 2 byte(s)
Range 1 to 20 step 1 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
Reserved I/O (4K/8K/12K/16K/20K) Range for this Root Bridge.
Opcode Numeric
Question ID 0xece
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x589
Width 1 byte(s)
Range 4 to 20 step 4 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
PCH PCIE Latency Reporting Enable/Disable
Opcode OneOf
Question ID 0xecf
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3f9
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
Record 4050
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 0xed0
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x431
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} {"condition_id": 1642, "type": "SuppressIf", "offset": 504440, "expr": ["EqIdVal QuestionId: 0xECF, Value: 0x0"]} Permalink
Record 4051
Snoop Latency Value Firmware Value
LTR Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xed1
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4b7
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} {"condition_id": 1642, "type": "SuppressIf", "offset": 504440, "expr": ["EqIdVal QuestionId: 0xECF, Value: 0x0"]} {"condition_id": 1643, "type": "SuppressIf", "offset": 504488, "expr": ["EqIdVal QuestionId: 0xED0, Value: 0x1", "Not"]} Permalink
Record 4052
Snoop Latency Multiplier Firmware Value
LTR Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xed2
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x44d
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} {"condition_id": 1642, "type": "SuppressIf", "offset": 504440, "expr": ["EqIdVal QuestionId: 0xECF, Value: 0x0"]} {"condition_id": 1643, "type": "SuppressIf", "offset": 504488, "expr": ["EqIdVal QuestionId: 0xED0, Value: 0x1", "Not"]} Permalink
Record 4053
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 0xed3
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x469
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} {"condition_id": 1642, "type": "SuppressIf", "offset": 504440, "expr": ["EqIdVal QuestionId: 0xECF, Value: 0x0"]} Permalink
Record 4054
Non Snoop Latency Value Firmware Value
LTR Non Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xed4
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4ef
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} {"condition_id": 1642, "type": "SuppressIf", "offset": 504440, "expr": ["EqIdVal QuestionId: 0xECF, Value: 0x0"]} {"condition_id": 1644, "type": "SuppressIf", "offset": 504632, "expr": ["EqIdVal QuestionId: 0xED3, Value: 0x1", "Not"]} Permalink
Record 4055
Non Snoop Latency Multiplier Firmware Value
LTR Non Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xed5
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x485
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} {"condition_id": 1642, "type": "SuppressIf", "offset": 504440, "expr": ["EqIdVal QuestionId: 0xECF, Value: 0x0"]} {"condition_id": 1644, "type": "SuppressIf", "offset": 504632, "expr": ["EqIdVal QuestionId: 0xED3, Value: 0x1", "Not"]} Permalink
PCIE LTR Configuration Lock
Opcode OneOf
Question ID 0xed6
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x415
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink
Record 4057
Peer Memory Write Enable Firmware Value
Peer Memory Write Enable/Disable
Opcode OneOf
Question ID 0xed7
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0xd4
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]} Permalink