Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026
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Overview / Manual / PCI Express Root Port 21
PCIe and Graphics
PCI Express Root Port 21
PCI Express Root Port 21 firmware setup page decoded from AMI HII/IFR resources.
Form ID 0x13f8
Records 34
Path Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 21
Record 3956
PCI Express Root Port 21 Firmware Value
Control the PCI Express Root Port.
Opcode OneOf
Question ID 0xe7b
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x113
Width 1 byte(s)
Range 0 to 1 step 0 Permalink
Record 3957
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 0xe7c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x37b
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} {"condition_id": 1628, "type": "GrayOutIf", "offset": 500991, "expr": ["EqIdVal QuestionId: 0xE89, 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 0x15f4
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x12f
Width 1 byte(s)
Range 0 to 4 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
PCI Express L1 Substates settings.
Opcode OneOf
Question ID 0x1610
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2d3
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
PCI Express L1 Low Substate Enable/Disable.
Opcode OneOf
Question ID 0xe7d
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2ef
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
Enable/Disable Access Control Services Extended Capability
Opcode OneOf
Question ID 0xe7e
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x30b
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
Enable/Disable Precision Time Measurement
Opcode OneOf
Question ID 0x162c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x327
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
Enable/Disable Downstream Port Containment
Opcode OneOf
Question ID 0xe7f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x343
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
Enable/Disable Rootport extensions for Downstream Port Containment
Opcode OneOf
Question ID 0xe80
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x35f
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
PCI Express Unsupported Request Reporting Enable/Disable.
Opcode OneOf
Question ID 0xe81
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x14b
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
PCI Express Device Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xe82
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x167
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
PCI Express Device Non-Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xe83
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x183
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
PCI Express Device Correctable Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xe84
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x19f
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
Root PCI Express System Error on Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xe85
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1f3
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
Root PCI Express System Error on Non-Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xe86
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x20f
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
Root PCI Express System Error on Correctable Error Enable/Disable.
Opcode OneOf
Question ID 0xe87
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x22b
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
PCI Express PME SCI Enable/Disable.
Opcode OneOf
Question ID 0xe88
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x247
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
PCI Express Hot Plug Enable/Disable.
Opcode OneOf
Question ID 0xe89
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x263
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} {"condition_id": 1629, "type": "GrayOutIf", "offset": 501543, "expr": ["EqIdVal QuestionId: 0xE7C, Value: 0x0"]} Permalink
Record 3974
Advanced Error Reporting Firmware Value
Advanced Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xe8a
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x27f
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
Configure PCIe Speed
Opcode OneOf
Question ID 0xe8b
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x29b
Width 1 byte(s)
Range 0 to 3 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
Record 3976
Transmitter Half Swing Firmware Value
Transmitter Half Swing Enable/Disable.
Opcode OneOf
Question ID 0xe8c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2b7
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
Record 3977
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 0xe8d
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3ab
Width 2 byte(s)
Range 0 to 65535 step 1 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
Record 3978
Extra Bus Reserved Firmware Value
Extra Bus Reserved (0-7) for bridges behind this Root Bridge.
Opcode Numeric
Question ID 0xe8e
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x533
Width 1 byte(s)
Range 0 to 7 step 1 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
Record 3979
Reserved Memory Firmware Value
Reserved Memory for this Root Bridge (1-20) MB
Opcode Numeric
Question ID 0xe8f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x563
Width 2 byte(s)
Range 1 to 20 step 1 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
Reserved I/O (4K/8K/12K/16K/20K) Range for this Root Bridge.
Opcode Numeric
Question ID 0xe90
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x587
Width 1 byte(s)
Range 4 to 20 step 4 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
PCH PCIE Latency Reporting Enable/Disable
Opcode OneOf
Question ID 0xe91
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3f7
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
Record 3982
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 0xe92
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x42f
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} {"condition_id": 1630, "type": "SuppressIf", "offset": 501858, "expr": ["EqIdVal QuestionId: 0xE91, Value: 0x0"]} Permalink
Record 3983
Snoop Latency Value Firmware Value
LTR Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xe93
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4b3
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} {"condition_id": 1630, "type": "SuppressIf", "offset": 501858, "expr": ["EqIdVal QuestionId: 0xE91, Value: 0x0"]} {"condition_id": 1631, "type": "SuppressIf", "offset": 501906, "expr": ["EqIdVal QuestionId: 0xE92, Value: 0x1", "Not"]} Permalink
Record 3984
Snoop Latency Multiplier Firmware Value
LTR Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xe94
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x44b
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} {"condition_id": 1630, "type": "SuppressIf", "offset": 501858, "expr": ["EqIdVal QuestionId: 0xE91, Value: 0x0"]} {"condition_id": 1631, "type": "SuppressIf", "offset": 501906, "expr": ["EqIdVal QuestionId: 0xE92, Value: 0x1", "Not"]} Permalink
Record 3985
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 0xe95
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x467
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} {"condition_id": 1630, "type": "SuppressIf", "offset": 501858, "expr": ["EqIdVal QuestionId: 0xE91, Value: 0x0"]} Permalink
Record 3986
Non Snoop Latency Value Firmware Value
LTR Non Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xe96
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4eb
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} {"condition_id": 1630, "type": "SuppressIf", "offset": 501858, "expr": ["EqIdVal QuestionId: 0xE91, Value: 0x0"]} {"condition_id": 1632, "type": "SuppressIf", "offset": 502050, "expr": ["EqIdVal QuestionId: 0xE95, Value: 0x1", "Not"]} Permalink
Record 3987
Non Snoop Latency Multiplier Firmware Value
LTR Non Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xe97
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x483
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} {"condition_id": 1630, "type": "SuppressIf", "offset": 501858, "expr": ["EqIdVal QuestionId: 0xE91, Value: 0x0"]} {"condition_id": 1632, "type": "SuppressIf", "offset": 502050, "expr": ["EqIdVal QuestionId: 0xE95, Value: 0x1", "Not"]} Permalink
PCIE LTR Configuration Lock
Opcode OneOf
Question ID 0xe98
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x413
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink
Record 3989
Peer Memory Write Enable Firmware Value
Peer Memory Write Enable/Disable
Opcode OneOf
Question ID 0xe99
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0xd2
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1627, "type": "SuppressIf", "offset": 500983, "expr": ["EqIdVal QuestionId: 0xE7B, Value: 0x0"]} Permalink