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Copyright 2015 by Assured Information Security, Inc. Created by Ross Philipson <philipsonr@ainfosec.com>. This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
What is TBOOT? It is the reference program from Intel for driving the Intel TXT hardware and starting a Measured Launch Environment (MLE). It lives here:
...
$ lspci -s 03:00.0 -vvv
03:00.0 Serial controller: Oxford Semiconductor Ltd Device c120 (prog-if 02 [16550])
Subsystem: Oxford Semiconductor Ltd Device c120
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx+
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 18
Region 0: I/O ports at e000 [size=8] <--- RIGHT THERE
Capabilities: [40] Power Management version 3
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=55mA PME(D0-,D1+,D2+,D3hot+,D3cold+)
Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
....
# So the serial lineparameter would look like:
serial=115200,8n1,0xe000
...