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New Linux Image!

New RaspberryPi -> New Image!
All links are changed: Have fun!

Ein neuer RaspberryPi -> Ein neues Image!
Alle Links sind geändert: Viel spaß!

//German version below

Hello everybody,

months without new blog posts, please apoligize, I had so much to do the last months.

Now i´ved patched the last Raspbian-Image "Stretch" with the TPM-SPI-driver, you´ll find the Image on this LINK.
In this Image the eltt2 tool ist NOT pre compiled.

please use:

git clone
cd eltt2
sudo ./eltt2 -g
sudo ./eltt2 -h

Have fun!

Bye for now!


// Deutsche Version

Hallo zusammen,

Monate ohne neue Blog-Postings, bitte entschuldigt, ich hatte einfach zu viel zu tun./

So, jetzt habe ich das letzte Raspbian-Image "Stretch" mit dem TPM-SPI-Treiber gepatcht, dieses findest du auf diesem LINK..

In diesem Image ist das eltt2-Tool NICHT vorkompiliert.

Um dies zu ändern:

git clone
cd eltt2
sudo ./eltt2 -g
sudo ./eltt2 -h

Das wars für heute!



//Germanversion below

Hello everybody,

currently there is a problem in the firmware of the TPM chip from Infineon which was installed on the LetsTrust TPM modules.

Information about the problem can be found at the following links:

Not affected are firmware versions >= 7.62.3126 for TPM 2.0.
You can check this under Linux with the eltt2 and the command "sudo ./eltt2 -g".

Unfortunately, there is currently no update tool which I could link here.

Max of pi3g has assured that he will take care of the rapid exchange of the modules.

Please note that when exchanging your module, all keys generated in the TPM and, of course, the stored keys will also be lost. Please take appropriate measures, for example, endcrypt your backups ^ __ ^.

Bye for now!

//German Version

Hallo allerseits,

aktuell gibt es ein Problem in der Firmware des TPM-Chips von Infineon welcher auf den LetsTrust-TPM-Modulen verbaut wurde.

Informationen zu dem Problem findest du unter folgende Links:

Nicht betroffen sind Firmwareversionen >= 7.62.3126 für TPM 2.0.
Prüfen kannst du dies unter Linux mit dem eltt2 und dem Befehl „sudo ./eltt2 –g“.

Leider gibt es aktuell noch kein Update-Tool welches ihr ich hier verlinken könnte.

Max von pi3g hat mit zugesichert, dass er sich um den zügigen Austausch der Module kümmern wird.

Bedenk bitte, dass bei dem Austausch deines Moduls alle im TPM generierten und natürlich auch die gespeicherten Keys verloren gehen. Treffe bitte entsprechende Maßnahmen entschlüssele zB deine Backups ^__^.

Bis bald!

Howto Enable TPM Support on a Raspberry PI (0, 0W, 1, 2, 3, 3b+) and make it work with the LetsTrust TPM

UPDATE: Works for Pi 3b+, too!

Due to the recent inclusion of the TPM_TIS_SPI patches to the mainline kernel
and the consequent backports to v4.9.x and 4.11.x it's now much easier to get
the support for the LetsTrust TPM up and running.
No more patching necessary!

tldr: Enable CONFIG_TCG_TIS_SPI in your Kernel Config, and modify your
device tree accordingly.

This tutorial will show you how to perform these steps for your Raspberry PI
(0, 0W, 1, 2, 3).

It is assumed that you are cross-compiling from your desktop PC (i.e. not
building the kernel on the raspberry itself) and create everything in your home directory (~).

For more details please also read the excellent guide from the Raspberry Pi
Foundation on howto compile your kernel.

On a Ubuntu system you should install the following packages

First download the toolchain you need for cross compilation
$ git clone
and add the tools to your executable search path
$ export PATH=$PATH:~/tools

Then grab the kernel sources
$ git clone --depth=1
and enter the directory
$ cd linux

Next step is to get the default kernel configuration:

For Pi 1, Pi 0, Pi 0 W, or Compute Module:
$ KERNEL=kernel
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- bcmrpi_defconfig

For Pi 2, Pi 3, or Compute Module 3:
$ KERNEL=kernel7
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- bcm2709_defconfig

Then we have to enable the TPM Support in the Kernel via make menuconfig
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- menuconfig
In this gui navigate to
Device Drivers
---> Character devices
---> TPM Hardware Support

and press M (for Module) or Y (for build-in support)
Then press enter to get into the subdirectory and select
---> TPM Interface Specification 1.3 Interface / TPM 2.0 FIFO Interface - (SPI)
also again either via M or Y

If you want to use the TPM's HardwareNumberGenerator feature, please select
---> Hardware Random Number Generator Core support
---> TPM HW Random Number Generator support

Save and exit the menuconfig.

If this is too much hassle for you, you can also edit your .config file and
add these 5 lines to it.

Next step is to add our DeviceTree Overlay to our kernel sources.
Simply download letstrust-tpm-overlay.dts and copy it to arch/arm/boot/dts/overlays/letstrust-tpm-overlay.dts
$ wget -O arch/arm/boot/dts/overlays/letstrust-tpm-overlay.dts

Now build your kernel and device tree blob
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage modules dtbs overlays/letstrust-tpm.dtbo -j8
please note the additional overlays/letstrust-tpm.dtbo

Now deploy your kernel and modules (standard rpi way, see howto above)
$ mkdir mnt/fat32
$ mkdir mnt/ext4
$ sudo mount /dev/sdb1 mnt/fat32
$ sudo mount /dev/sdb2 mnt/ext4
$ sudo make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- INSTALL_MOD_PATH=mnt/ext4 modules_install
$ sudo cp mnt/fat32/$KERNEL.img mnt/fat32/$KERNEL-backup.img
$ sudo cp arch/arm/boot/zImage mnt/fat32/$KERNEL.img
$ sudo cp arch/arm/boot/dts/*.dtb mnt/fat32/
$ sudo cp arch/arm/boot/dts/overlays/*.dtb* mnt/fat32/overlays/
$ sudo cp arch/arm/boot/dts/overlays/README mnt/fat32/overlays/

Before you unmount your RPI SD Card, open mnt/fat32/config.txt
and ensure the line dtparam=spi=on isn't commented out (so no # at the beginning of the line)
and add
just beneath it.

More Details:
Of course we uploaded a reference config.txt for you

Unmount your SD card,
$ sudo umount mnt/fat32
$ sudo umount mnt/ext4

Put it into your PI and boot your raspberry pi.

After booting, on a shell do
sudo modprobe tpm_tis_spi and /dev/tpm0 should be visible.
(We are looking into it why it does not autoload)

You can tryout the functionality of your TPM with

Happy Hacking

p.s.: If you just want to try it out without compiling:
Download boot-v4.9.33.tpm.tar.bz2 (kernel, dtb, overlays) + modules-v4.9.33.tpm.tar.bz2

Extract the boot-v4.9.33.tpm.tar.bz2 into the boot partition of your rpi (e.g. sdb1) and the modules-v4.9.33.tpm.tar.bz2 into the second partition.(e.g. sdb2)

$ wget -O /tmp/boot-v4.9.33.tpm.tar.bz2
$ wget -O /tmp/modules-v4.9.33.tpm.tar.bz2
$ sudo mount /dev/sdb1 mnt/fat32
$ sudo mount /dev/sdb2 mnt/ext4
$ cd mnt/fat32
$ sudo tar -xvf /tmp/boot-v4.9.33.tpm.tar.bz2
$ cd ../ext4
$ sudo tar -xvf /tmp/modules-v4.9.33.tpm.tar.bz2
$ cd ..
$ sudo umount /dev/sdb1
$ sudo umount /dev/sdb2