Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026
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Overview / Manual / PCI Express Root Port 1
PCIe and Graphics
PCI Express Root Port 1
PCI Express Root Port 1 firmware setup page decoded from AMI HII/IFR resources.
Form ID 0x157c
Records 34
Path Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 1
Record 3276
PCI Express Root Port 1 Firmware Value
Control the PCI Express Root Port.
Opcode OneOf
Question ID 0xc0f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0xff
Width 1 byte(s)
Range 0 to 1 step 0 Permalink
Record 3277
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 0xc10
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x367
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} {"condition_id": 1508, "type": "GrayOutIf", "offset": 475171, "expr": ["EqIdVal QuestionId: 0xC1D, 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 0x15e0
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x11b
Width 1 byte(s)
Range 0 to 4 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
PCI Express L1 Substates settings.
Opcode OneOf
Question ID 0x15fc
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2bf
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
PCI Express L1 Low Substate Enable/Disable.
Opcode OneOf
Question ID 0xc11
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2db
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
Enable/Disable Access Control Services Extended Capability
Opcode OneOf
Question ID 0xc12
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2f7
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
Enable/Disable Precision Time Measurement
Opcode OneOf
Question ID 0x1618
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x313
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
Enable/Disable Downstream Port Containment
Opcode OneOf
Question ID 0xc13
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x32f
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
Enable/Disable Rootport extensions for Downstream Port Containment
Opcode OneOf
Question ID 0xc14
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x34b
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
PCI Express Unsupported Request Reporting Enable/Disable.
Opcode OneOf
Question ID 0xc15
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x137
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
PCI Express Device Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xc16
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x153
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
PCI Express Device Non-Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xc17
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x16f
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
PCI Express Device Correctable Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xc18
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x18b
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
Root PCI Express System Error on Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xc19
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1df
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
Root PCI Express System Error on Non-Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xc1a
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1fb
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
Root PCI Express System Error on Correctable Error Enable/Disable.
Opcode OneOf
Question ID 0xc1b
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x217
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
PCI Express PME SCI Enable/Disable.
Opcode OneOf
Question ID 0xc1c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x233
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
PCI Express Hot Plug Enable/Disable.
Opcode OneOf
Question ID 0xc1d
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x24f
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} {"condition_id": 1509, "type": "GrayOutIf", "offset": 475723, "expr": ["EqIdVal QuestionId: 0xC10, Value: 0x0"]} Permalink
Record 3294
Advanced Error Reporting Firmware Value
Advanced Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xc1e
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x26b
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
Configure PCIe Speed
Opcode OneOf
Question ID 0xc1f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x287
Width 1 byte(s)
Range 0 to 3 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
Record 3296
Transmitter Half Swing Firmware Value
Transmitter Half Swing Enable/Disable.
Opcode OneOf
Question ID 0xc20
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2a3
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
Record 3297
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 0xc21
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x383
Width 2 byte(s)
Range 0 to 65535 step 1 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
Record 3298
Extra Bus Reserved Firmware Value
Extra Bus Reserved (0-7) for bridges behind this Root Bridge.
Opcode Numeric
Question ID 0xc22
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x51f
Width 1 byte(s)
Range 0 to 7 step 1 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
Record 3299
Reserved Memory Firmware Value
Reserved Memory for this Root Bridge (1-20) MB
Opcode Numeric
Question ID 0xc23
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x53b
Width 2 byte(s)
Range 1 to 20 step 1 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
Reserved I/O (4K/8K/12K/16K/20K) Range for this Root Bridge.
Opcode Numeric
Question ID 0xc24
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x573
Width 1 byte(s)
Range 4 to 20 step 4 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
PCH PCIE Latency Reporting Enable/Disable
Opcode OneOf
Question ID 0xc25
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3e3
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
Record 3302
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 0xc26
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x41b
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} {"condition_id": 1510, "type": "SuppressIf", "offset": 476038, "expr": ["EqIdVal QuestionId: 0xC25, Value: 0x0"]} Permalink
Record 3303
Snoop Latency Value Firmware Value
LTR Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xc27
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x48b
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} {"condition_id": 1510, "type": "SuppressIf", "offset": 476038, "expr": ["EqIdVal QuestionId: 0xC25, Value: 0x0"]} {"condition_id": 1511, "type": "SuppressIf", "offset": 476086, "expr": ["EqIdVal QuestionId: 0xC26, Value: 0x1", "Not"]} Permalink
Record 3304
Snoop Latency Multiplier Firmware Value
LTR Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xc28
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x437
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} {"condition_id": 1510, "type": "SuppressIf", "offset": 476038, "expr": ["EqIdVal QuestionId: 0xC25, Value: 0x0"]} {"condition_id": 1511, "type": "SuppressIf", "offset": 476086, "expr": ["EqIdVal QuestionId: 0xC26, Value: 0x1", "Not"]} Permalink
Record 3305
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 0xc29
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x453
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} {"condition_id": 1510, "type": "SuppressIf", "offset": 476038, "expr": ["EqIdVal QuestionId: 0xC25, Value: 0x0"]} Permalink
Record 3306
Non Snoop Latency Value Firmware Value
LTR Non Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xc2a
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4c3
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} {"condition_id": 1510, "type": "SuppressIf", "offset": 476038, "expr": ["EqIdVal QuestionId: 0xC25, Value: 0x0"]} {"condition_id": 1512, "type": "SuppressIf", "offset": 476230, "expr": ["EqIdVal QuestionId: 0xC29, Value: 0x1", "Not"]} Permalink
Record 3307
Non Snoop Latency Multiplier Firmware Value
LTR Non Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xc2b
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x46f
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} {"condition_id": 1510, "type": "SuppressIf", "offset": 476038, "expr": ["EqIdVal QuestionId: 0xC25, Value: 0x0"]} {"condition_id": 1512, "type": "SuppressIf", "offset": 476230, "expr": ["EqIdVal QuestionId: 0xC29, Value: 0x1", "Not"]} Permalink
PCIE LTR Configuration Lock
Opcode OneOf
Question ID 0xc2c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3ff
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink
Record 3309
Peer Memory Write Enable Firmware Value
Peer Memory Write Enable/Disable
Opcode OneOf
Question ID 0xc2d
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0xbe
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]} Permalink