Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026
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Overview / Manual / PCI Express Root Port 8
PCIe and Graphics
PCI Express Root Port 8
PCI Express Root Port 8 firmware setup page decoded from AMI HII/IFR resources.
Form ID 0x103a
Records 34
Path Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 8
Record 3514
PCI Express Root Port 8 Firmware Value
Control the PCI Express Root Port.
Opcode OneOf
Question ID 0xce8
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x106
Width 1 byte(s)
Range 0 to 1 step 0 Permalink
Record 3515
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 0xce9
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x36e
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} {"condition_id": 1550, "type": "GrayOutIf", "offset": 484208, "expr": ["EqIdVal QuestionId: 0xCF6, 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 0x15e7
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x122
Width 1 byte(s)
Range 0 to 4 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
PCI Express L1 Substates settings.
Opcode OneOf
Question ID 0x1603
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2c6
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
PCI Express L1 Low Substate Enable/Disable.
Opcode OneOf
Question ID 0xcea
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2e2
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
Enable/Disable Access Control Services Extended Capability
Opcode OneOf
Question ID 0xceb
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2fe
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
Enable/Disable Precision Time Measurement
Opcode OneOf
Question ID 0x161f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x31a
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
Enable/Disable Downstream Port Containment
Opcode OneOf
Question ID 0xcec
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x336
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
Enable/Disable Rootport extensions for Downstream Port Containment
Opcode OneOf
Question ID 0xced
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x352
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
PCI Express Unsupported Request Reporting Enable/Disable.
Opcode OneOf
Question ID 0xcee
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x13e
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
PCI Express Device Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xcef
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x15a
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
PCI Express Device Non-Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xcf0
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x176
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
PCI Express Device Correctable Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xcf1
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x192
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
Root PCI Express System Error on Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xcf2
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1e6
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
Root PCI Express System Error on Non-Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xcf3
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x202
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
Root PCI Express System Error on Correctable Error Enable/Disable.
Opcode OneOf
Question ID 0xcf4
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x21e
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
PCI Express PME SCI Enable/Disable.
Opcode OneOf
Question ID 0xcf5
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x23a
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
PCI Express Hot Plug Enable/Disable.
Opcode OneOf
Question ID 0xcf6
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x256
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} {"condition_id": 1551, "type": "GrayOutIf", "offset": 484760, "expr": ["EqIdVal QuestionId: 0xCE9, Value: 0x0"]} Permalink
Record 3532
Advanced Error Reporting Firmware Value
Advanced Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xcf7
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x272
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
Configure PCIe Speed
Opcode OneOf
Question ID 0xcf8
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x28e
Width 1 byte(s)
Range 0 to 3 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
Record 3534
Transmitter Half Swing Firmware Value
Transmitter Half Swing Enable/Disable.
Opcode OneOf
Question ID 0xcf9
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2aa
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
Record 3535
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 0xcfa
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x391
Width 2 byte(s)
Range 0 to 65535 step 1 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
Record 3536
Extra Bus Reserved Firmware Value
Extra Bus Reserved (0-7) for bridges behind this Root Bridge.
Opcode Numeric
Question ID 0xcfb
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x526
Width 1 byte(s)
Range 0 to 7 step 1 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
Record 3537
Reserved Memory Firmware Value
Reserved Memory for this Root Bridge (1-20) MB
Opcode Numeric
Question ID 0xcfc
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x549
Width 2 byte(s)
Range 1 to 20 step 1 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
Reserved I/O (4K/8K/12K/16K/20K) Range for this Root Bridge.
Opcode Numeric
Question ID 0xcfd
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x57a
Width 1 byte(s)
Range 4 to 20 step 4 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
PCH PCIE Latency Reporting Enable/Disable
Opcode OneOf
Question ID 0xcfe
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3ea
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
Record 3540
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 0xcff
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x422
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} {"condition_id": 1552, "type": "SuppressIf", "offset": 485075, "expr": ["EqIdVal QuestionId: 0xCFE, Value: 0x0"]} Permalink
Record 3541
Snoop Latency Value Firmware Value
LTR Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xd00
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x499
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} {"condition_id": 1552, "type": "SuppressIf", "offset": 485075, "expr": ["EqIdVal QuestionId: 0xCFE, Value: 0x0"]} {"condition_id": 1553, "type": "SuppressIf", "offset": 485123, "expr": ["EqIdVal QuestionId: 0xCFF, Value: 0x1", "Not"]} Permalink
Record 3542
Snoop Latency Multiplier Firmware Value
LTR Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xd01
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x43e
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} {"condition_id": 1552, "type": "SuppressIf", "offset": 485075, "expr": ["EqIdVal QuestionId: 0xCFE, Value: 0x0"]} {"condition_id": 1553, "type": "SuppressIf", "offset": 485123, "expr": ["EqIdVal QuestionId: 0xCFF, Value: 0x1", "Not"]} Permalink
Record 3543
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 0xd02
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x45a
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} {"condition_id": 1552, "type": "SuppressIf", "offset": 485075, "expr": ["EqIdVal QuestionId: 0xCFE, Value: 0x0"]} Permalink
Record 3544
Non Snoop Latency Value Firmware Value
LTR Non Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xd03
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4d1
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} {"condition_id": 1552, "type": "SuppressIf", "offset": 485075, "expr": ["EqIdVal QuestionId: 0xCFE, Value: 0x0"]} {"condition_id": 1554, "type": "SuppressIf", "offset": 485267, "expr": ["EqIdVal QuestionId: 0xD02, Value: 0x1", "Not"]} Permalink
Record 3545
Non Snoop Latency Multiplier Firmware Value
LTR Non Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xd04
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x476
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} {"condition_id": 1552, "type": "SuppressIf", "offset": 485075, "expr": ["EqIdVal QuestionId: 0xCFE, Value: 0x0"]} {"condition_id": 1554, "type": "SuppressIf", "offset": 485267, "expr": ["EqIdVal QuestionId: 0xD02, Value: 0x1", "Not"]} Permalink
PCIE LTR Configuration Lock
Opcode OneOf
Question ID 0xd05
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x406
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink
Record 3547
Peer Memory Write Enable Firmware Value
Peer Memory Write Enable/Disable
Opcode OneOf
Question ID 0xd06
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0xc5
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1549, "type": "SuppressIf", "offset": 484200, "expr": ["EqIdVal QuestionId: 0xCE8, Value: 0x0"]} Permalink