pi3g LetsTrust TPM Module User Manual
- June 1, 2024
- pi3g
Table of Contents
User Manual
LetsTrust TPM
Information
updated 2019/05
Installation & Configuration
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Product contents
1. LetsTrust TPM Module (12.7 x 17.5 mm)
2. female header (2×8 pin)
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Install LetsTrust TPM
The supplied female header helps you plug in the LetsTrust TPM in the correct position, but it is not necessary to operate the LetsTrust TPM Module.
Please insert the female header starting with pin 1 (on the far left, see picture below) into the Raspberry Pi GPIO header. Our picture shows the Raspberry Pi 3 Model B.
LetsTrust TPM is, of course, also compatible with other Raspberry Pi models.
Next, insert the LetsTrust TPM module directly next to the female header. (The TPM module will be installed starting with pin 17, facing downwards with the chip, and oriented towards the HDMI port.)
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Configuration & Activation with Raspbian
The LetsTrust TPM module is supported directly by Linux, starting with Kernel 4.14.85. Please refer to www.letsTrust.de for further information. Update to the newest RaspberryPi OS and activate the TPM as /dev/tpm0 using the following commands:
sudo apt-get update && sudo apt-get upgrade sudo nano /boot/config.txt
sudo reboot -
Usage examples
The best projects for the TPM module come from the community, we are supplying the hardware. Already, several core software packages are available:
| Link | Description |
|---|---|
| https://github.com/tpm2-software | TCG TPM2 software stack |
| https://github.com/wolfSSL/wolfTPM | wolfTPM Software Stack for |
microcontrollers
https://github.com/Infineon/eltt2| ELTT2 Infineon Embedded Linux TPM Toolbox
2 for TP 2.0 – test, diagnostics and essential state changing of the Infineon
TPM chip
https://github.com/PaulKissinger/LetsTrust| Useful resources & script to get
you started with the TPM, and compilation / installation of the TPM 2.0 Tools.
We link application samples, documentation, and additional information from
the community homepage www.letsTrust.de
If you have interesting application examples, or are developing applications
yourself, we ask you to send us an e-mail at
support@pi3g.com or
info@letstrust.de
FAQ & Good to know
Which chip does the TPM use?
We use the Infineon OPTIGA™ SLB 9672 TPM 2.0 with Firmware 1 5 . 2 3 or later. This chip is compliant to the TCG TPM 2.0 Specification, revision 1.59. Starting with Firmware Version 15. 23 , the SLB 9672 is certified with Common Criteria EAL4+ and FIPS 140-2.
Can SPI still be used?
Yes, CS0 can still be used. The TPM module uses CS1. It is possible to address the TPM module using CS0, by 1) moving the 0-Ohm resistor from position R3 to R2, AND 2) patching the device tree overlay to talk to the module on CS0. The component placing can be found here: https://www.letstrust.de/uploads/letstrust-v2.2.placement.cs1.pdf Can I download a circuit diagram? Yes! A circuit diagram is available here: https://www.letstrust.de/uploads/letstrust-v2.2.schematic.pdf
How do I get support?
Many questions are already answered in the blog entries on: www.letsTrust.de If you have additional in-depth questions, please get in touch with us: support@pi3g.com
Can you supply custom versions of the TPM module?
Starting at just 100 modules, we can modify the design for you. Contact us here for inquiries:
support@pi3g.com
buyzero.de – your Pi Zero
W & LetsTrust TPM module supplier
(off icial German distributor)
References
- Buyzero: Raspberry Pi & Co.
- GitHub - PaulKissinger/LetsTrust: TPM2 related stuff
- Linux TPM2 & TSS2 Software · GitHub
- GitHub - wolfSSL/wolfTPM: wolfTPM is a highly portable TPM 2.0 library, designed for embedded use.
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