https://github.com/theopolis/tpm-i2c-atmel

Linux Kernel Driver for Atmel's AT97SC3204T I2C TPM (for Beaglebone)
https://github.com/theopolis/tpm-i2c-atmel

Last synced: 19 days ago
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Linux Kernel Driver for Atmel's AT97SC3204T I2C TPM (for Beaglebone)

• Host: GitHub
• URL: https://github.com/theopolis/tpm-i2c-atmel
• Owner: theopolis
• Created: 2012-11-26T05:54:55.000Z (almost 12 years ago)
• Default Branch: master
• Last Pushed: 2015-02-05T11:11:36.000Z (almost 10 years ago)
• Last Synced: 2023-03-22T18:12:37.495Z (over 1 year ago)
• Language: C
• Size: 512 KB
• Stars: 17
• Watchers: 7
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
ATMEL's AT97SC3204T I2C TPM

==================================================

*NOTE:* Support exists in mainline Linux now. 

## Instructions (Kernel):

The following few steps will add the I2C TPM as a tristate in `drivers/char/tpm`.

You will need to configure your board to include the TPM on the correct I2C bus. 

Atmel's I2C TPM has an address of 0x29. You can add: 

```cpp

{ I2C_BOARD_INFO("tpm_i2c_atmel", 0x29), }

```

to the `i2c_board_info` struct used by the I2C bus.

0. Patch your system board to include `tpm_i2c_atmel` with the I2C bus and address of the TPM. 

1. Insert support for the TPM: `[tpm-i2c-atmel] $ bash ./patch_kernel.sh /kernel/source` 

   This moves the source into `drivers/char/tpm`, and adds support to Kconfig & Makefile.

2. Add your preference for `CONFIG_TCG_TIS_I2C_ATMEL`.

3. Compile your kernel.

## Beaglebone (A5+) (Kernel):

For a BeagleBone, in addition to the above steps, there are two included patches

to (1) enable the I2C-2 bus, and (2) add the I2C TPM at address 0x29 on I2C-2.

0. Follow the above

1. Apply patches: (for Linux 3.7, only patch `bb-ra5-add-tpm-i2c-atmel-3.7.patch`)

```

[kernel-dir] $ patch -p0 < /tpm-i2c-atmel/patches/bb-ra5-add-i2c1.patch

[kernel-dir] $ patch -p0 < /tpm-i2c-atmel/patches/bb-ra5-add-tpm-i2c-atmel.patch

```

## Beaglebone (A5+) (Module):

If you would like the Atmel I2C TPM driver as a module built outside of the kernel

you can checkout the beaglebone branch and modify `tpm_i2c_atmel.`c to specify the 

I2C bus and address (though should not change).

0. (Optional) Patch your `board-am335xevm.c` using `patches/bb-ra5-add-i2c1.patch`.

   `[kernel-dir] $ patch -p0 < /tpm-i2c-atmel/bb-ra5-add-i2c1.patch`

   This will enable the I2C-2 bus. The BeagleBone SRM identifies I2C-2 for use with

   peripherals. 

3. `git checkout -b beaglebone beaglebone`

4. `KERNEL_DIR=/location CROSS_COMPILER=/location/bin/arm-linux- make`

5. Copy the .ko to the BeagleBone: `insmod ./tpm_i2c_atmel.ko`

## Other:

The TPM will need initialization; TrouSerS's tpm_tools can do this from userspace.

0. `git clone git://trousers.git.sourceforge.net/gitroot/trousers/trousers`

1. `git clone git://trousers.git.sourceforge.net/gitroot/trousers/tpm-tools`

2. Follow the directions for both, tpm-tools depends on TrouSerS.

3. `./tpm-tools/src/tpm_mgmt/tpm_startup`

*Note:* newer versions of the Linux Kernel support TPM initialization and self test.

  We expect U-boot to have issued a startup and self test, similar to platforms 

  implementing TPM in BIOS.