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AM5728: TPM I2C Error on Custom Board

rohit yadav
Intellectual 400 points

Part Number: AM5728

Hi

I am working on a custom board based on AM5728 SoC.

We have connected ATMEL  TPM on I2C bus 2. 

When I run i2cdump command on TPM , I am getting following error. 

root@am57xx-evm:~# i2cdump -f -y 1 0x29
No size specified (using byte-data access)
[  734.996071] omap_i2c 48072000.i2c: Arbitration lost
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: XX [  738.071653] omap_i2c 48072000.i2c: controller timed out
XX XX [  738.131858] omap_i2c 48072000.i2c: Arbitration lost
XX [  741.191661] omap_i2c 48072000.i2c: controller timed out
XX XX [  741.251893] omap_i2c 48072000.i2c: Arbitration lost
XX [  744.311642] omap_i2c 48072000.i2c: controller timed out
XX XX [  744.371872] omap_i2c 48072000.i2c: Arbitration lost
XX [  747.511648] omap_i2c 48072000.i2c: controller timed out
XX XX [  747.571853] omap_i2c 48072000.i2c: Arbitration lost
XX [  750.631698] omap_i2c 48072000.i2c: controller timed out
XX XX [  750.691840] omap_i2c 48072000.i2c: Arbitration lost
XX    XXXXXXXXXXXXXXXX
10: [  753.751678] omap_i2c 48072000.i2c: controller timed out
XX XX [  753.821864] omap_i2c 48072000.i2c: Arbitration lost
XX [  756.871683] omap_i2c 48072000.i2c: controller timed out
XX XX [  756.931845] omap_i2c 48072000.i2c: Arbitration lost

  • 0
    TI__Expert 6870 points

    Hi,

    As mentioned in the earlier thread " TI doesn't have experience with Atmel TPMs being used for securing boot. As you correctly observe, our suggestion would be to use a secure device with so that the root of trust is secured entirely within the chip from time zero. So since this question is really about software drivers to interact with the Atmel TPM, our recommendation would be to consult with Atmel support.".

    Previous thread: e2e.ti.com/.../am5728-tpm-with-am5728