71 lines
1.8 KiB
Markdown
71 lines
1.8 KiB
Markdown
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<!--
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---
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name: LetsTrust-TPM
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class: board
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type: other
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formfactor: Custom
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manufacturer: pi3g
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collected: Other
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description: Infineon SLB9670 TPM2.0 daughter board for the Raspberry PI
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url: https://buyzero.de/products/letstrust-hardware-tpm-trusted-platform-module
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schematic: http://www.letstrust.de/uploads/letstrust-v2.0.schematic.pdf
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buy: https://buyzero.de/products/letstrust-hardware-tpm-trusted-platform-module
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image: 'letstrust-tpm.png'
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pincount: 10
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eeprom: no
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power:
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'17':
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ground:
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'20':
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'25':
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pin:
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'18':
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name: Reset
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mode: output
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active: low
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'19':
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mode: spi
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'21':
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mode: spi
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'23':
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mode: spi
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22:
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name: PIRQ
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mode: input
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active: low
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26:
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mode: spi
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-->
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# LetsTrust-TPM
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LetsTrust-TPM is a TPM2.0 daughter board for the Raspberry Pi platform based on an Infineon SLB9670 chip.
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It is compatible with all Raspberry Pi models and probably the smallest available addon board on the market.
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The TPM can be used e.g. as a secure keystore or as an hardware random number generator.
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In order to use it your kernel must have the following options enabled:
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```kernelconfig
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CONFIG_HW_RANDOM_TPM=m
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CONFIG_TCG_TPM=m
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CONFIG_TCG_TIS_CORE=m
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CONFIG_TCG_TIS_SPI=m
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CONFIG_SECURITYFS=y
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```
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and a suitable device tree overlay:
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```dts
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slb9670: slb9670@0{
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compatible = "infineon,slb9670";
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reg = <1>; /* CE1 */
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#address-cells = <1>;
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#size-cells = <0>;
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spi-max-frequency = <32000000>;
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status = "okay";
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};
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```
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Per default CE1 is used as chip select, CE0 can also be used by re-soldering a 0-ohm resistor.
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A full dts overlay is available <a href="https://www.letstrust.de/uploads/letstrust-tpm-overlay.dts">here</a>,
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or you can also find a pre-compiled image with TPM support and the complete build-instructions at <a href=https://www.letstrust.de>letstrust.de</a>.
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