[TrouSerS-users] TPM 1.2 with Exynos5422(ARMv7)

[mipsan.K]

Dear,

I'm handling a TPM with Exynos5422, and Debian Jessie as an OS.
TPM is connected via I2C with SoC.
- Kernel ver: 3.10.96
- Debian Jessie 8.1
- trousers: 0.3.13-4
- tpm-tools: 1.3.8-2

After start TrouSers, tpm_version command shows as follow;
Restarting trousers (via systemctl): trousers.service.
TPM 1.2 Version Info:
Chip Version: 1.2.133.32
Spec Level: 2
Errata Revision: 3
TPM Vendor ID: IFX
Vendor Specific data: 85200050 0074706d 3438ffff ff
TPM Version: 01010000
Manufacturer Info: 49465800

However, when I try to takeownership, it returns an error as follow;
and setenable as well.

***@odroid:/home/odroid# tpm_takeownership
Enter owner password:
Confirm password:
Enter SRK password:
Confirm password:
Tspi_TPM_TakeOwnership failed: 0x00000007 - layer=tpm, code=0007 (7), TPM
is disabled

***@odroid:/home/odroid# tpm_clear -f
Tspi_TPM_ClearOwner failed: 0x00000007 - layer=tpm, code=0007 (7), TPM is
disabled

***@odroid:/home/odroid# tpm_setenable -e
Enter owner password:
Tspi_TPM_SetStatus failed: 0x00000001 - layer=tpm, code=0001 (1),
Authentication failed

***@odroid:/home/odroid# tpm_setenable -e
Enter owner password:
Tspi_TPM_SetStatus failed: 0x00000803 - layer=tpm, code=0803 (2051), TPM is
defending against dictionary attacks and is in some time-out period
-------------------------

I cannot clear TPM nor get ownership for further job.
Any idea would be appreciated.

Thanks
mipsan

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[Ken Goldman]

Post by mipsan.K
However, when I try to takeownership, it returns an error as follow;
Tspi_TPM_TakeOwnership failed: 0x00000007 - layer=tpm, code=0007 (7),
TPM is disabled

The error says it - your TPM is disabled. Typically, enabling the TPM
is done in BIOS. If your platform doesn't support that, you have to
somehow run TPM_PhysicalEnable while asserting physical presence.