How to write OTPMK on wandboard using C++ code

[vikas_sh1]

Hi All,

I need to write the OTPMK on wandboard using c++ code on evaluation board. can anyone help me how we can write this on board.

BR

Vikas Sharma

[Yuri]

From the "i.MX_6_Linux_High_Assurance_Boot_(HAB)_User's_Guide.pdf" :

On production parts, the OTPMK are be burned by Freescale prior to shipping the device.

The value burned by Freescale is random and not recorded. The intent of the

OTPMK is to be a secret key that is only known to CAAM so the value

below is only meant for testing purposes. In order to use HAB, these fuses

should be programmed. One can determine if a valid OTPMK has been

burned by checking the OTPMK_ZERO bit in the SNVS_HP Status Register.

Have a great day,
Yuri

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[vikas_sh1]

Thank Yuri.

If that is the case then where can we write the Keys?

If we want to use the ZMK (Zeroizable Master Key), and a security event happens (erasing the key) can it be re-programmed from software? How can we use ZMK.

BR

Vikas Sharma

[Yuri]

The following may be helpful.i.MX6 CAAM : sm_test.c in 3.0.35 kernel broken

Regards,

Yuri.