Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026
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Overview / Manual / ITBT Root Port 0 Configuration Onboard Devices
ITBT Root Port 0 Configuration
ITBT Root Port 0 Configuration firmware setup page decoded from AMI HII/IFR resources.
Form ID 0x2812
Records 6
Path Setup / Advanced / Thunderbolt(TM) Configuration / Integrated Thunderbolt(TM) Configuration / ITBT Root Port 0 Configuration / Setup / Advanced / Advanced / Thunderbolt(TM) Configuration / Integrated Thunderbolt(TM) Configuration / ITBT Root Port 0 Configuration / Setup / Advanced / Platform Settings / TCSS Platform Setting / Thunderbolt(TM) Configuration / Integrated Thunderbolt(TM) Configuration / ITBT Root Port 0 Configuration
Record 1448
ITBT Root Port 0 Firmware Value
AUTO - Default(Platform Specific)
Opcode OneOf
Question ID 0x2805
VarStore Setup
VarStore GUID EC87D643-EBA4-4BB5-A1E5-3F3E36B20DA9
Offset 0x7d0
Width 1 byte(s)
Range 0 to 1 step 0 Permalink
Record 1449
Extra Bus Reserved Firmware Value
Extra Bus Reserved 42.
Firmware help text Extra Bus Reserved 42.
Extra Bus Reserved is required for each layer = (Extra Bus Reserved on the previous layer - 2 - the number of non-hot-plug ports in the current layer) / the number of hot-plug ports in the current layer
Example:
2 non-hot-plug ports and 3 hot-plug ports per connected device have
Recommend below setting
1 device = 7
2 device = 25
3 device = 79, disable one iTBT root port
4 device = 224, disable three iTBT root port, and not every hotplug port supports connecting to the next layer of devices
etc ...
Opcode Numeric
Question ID 0x52a
VarStore Setup
VarStore GUID EC87D643-EBA4-4BB5-A1E5-3F3E36B20DA9
Offset 0x7d6
Width 1 byte(s)
Range 0 to 224 step 1 Permalink
Record 1450
Reserved Memory Firmware Value
Reserved Memory for this Root Bridge (1-4096) MB
Opcode Numeric
Question ID 0x52b
VarStore Setup
VarStore GUID EC87D643-EBA4-4BB5-A1E5-3F3E36B20DA9
Offset 0x7dc
Width 2 byte(s)
Range 1 to 4096 step 1 Permalink
Record 1451
Memory Alignment Firmware Value
Memory Alignment (0-31 bits)
Opcode Numeric
Question ID 0x52c
VarStore Setup
VarStore GUID EC87D643-EBA4-4BB5-A1E5-3F3E36B20DA9
Offset 0x7e8
Width 1 byte(s)
Range 0 to 31 step 1 Permalink
Record 1452
Reserved PMemory Firmware Value
Reserved Prefetchable Memory for this Root Bridge (1-4096) MB
Opcode Numeric
Question ID 0x52d
VarStore Setup
VarStore GUID EC87D643-EBA4-4BB5-A1E5-3F3E36B20DA9
Offset 0x7ee
Width 2 byte(s)
Range 1 to 4096 step 1 Permalink
Record 1453
PMemory Alignment Firmware Value
PMemory Alignment (0-31 bits)
Opcode Numeric
Question ID 0x52e
VarStore Setup
VarStore GUID EC87D643-EBA4-4BB5-A1E5-3F3E36B20DA9
Offset 0x7fa
Width 1 byte(s)
Range 0 to 31 step 1 Permalink