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
Solved! Go to Solution.
Jerome, hello !
1.
Please check if the issue is not concerned with cache coherency.
2.
Please verify if clear bit operation is used, when accessing to HW_DCP_STAT(_CLR).
3.
You may look at FSL Linux BSP. Please refer to Chapter 20 [Data Co-Processor
(DCP) Driver ] of “MX28_EVK_Linux_Reference_Manual.pdf”. Section 20.6 (Unit Test)
describes Tcrypt as DCP test module.
Have a great day,
Yuri
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Hi Yuri,
Your first point was the good one!
If I clean cache before starting dcp, all is good.
Thanks,
Have a great day too!
Jérôme
Jerome, hello !
1.
Please check if the issue is not concerned with cache coherency.
2.
Please verify if clear bit operation is used, when accessing to HW_DCP_STAT(_CLR).
3.
You may look at FSL Linux BSP. Please refer to Chapter 20 [Data Co-Processor
(DCP) Driver ] of “MX28_EVK_Linux_Reference_Manual.pdf”. Section 20.6 (Unit Test)
describes Tcrypt as DCP test module.
Have a great day,
Yuri
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
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