CSE PRAM is not writable (S32K146)

[warai]

Hi,

Why is address 0x14001000 (CSE PRAM) is non-writable?

Did I messed up my flash partitioning?

Is the location part of the FPROT?

Kind regards,

Marizonne

cse_pram.JPG

 

[warai]

Hi Lukas,

The FSTAT has no error flags asserted.

My suspicion is that the board I'm using is partitioned with CSEC Key Size = 0. This is the reason why the PRAM is non-accessible. Is my understanding correct?

[lukaszadrapa]

Hi,

yes, that's correct. The PRAM is available if the CSE is enabled by partitioning - when the number of keys is configured to non-zero value.

Regards,

Lukas

[lukaszadrapa]

Hi Marizonne,

how did you partitioned the device?

Let me copy here from the reference manual some reasons why the PRAM is locked:

lukaszadrapa_0-1622027606240.png

And:

lukaszadrapa_1-1622027669913.png

So, I would check the content of FSTAT register as a first step.

Regards,

Lukas

[Usernamex]

Hi LuKas,

is there any way to unlock the CSE?

i've got the same problem after i called the eraseKeys() API from csec_utils.c.

after that, any write to CSE_PRAM will cause a DefaultISR.

the FSTAT is 0x80; FCSESTAT is 0x40.