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imx28 dcp encryp only once

Question asked by Jérôme Dusautois on Aug 3, 2015
Latest reply on Aug 5, 2015 by Jérôme Dusautois

Hi,

 

I try to use DCP to encrypt buffer with OTP key.

I can encrypt buffer only one time for each board reset. After first encrypt, I don't have error but result buffer is always set to initial value.

 

I try with key in payload and I have same result.

I try for all channel and I have same result.

I try to soft reset DCP and I have same result.

 

In fact It try many other cases and I have same result : only first DCP command work. All other leave result buffer unchanged.

 

Can you help me, please.

 

best regards

Jérôme

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