storing critical data in S32K144

[d_shivamkumar]

Problem background:

I am using S32K144 for storage of credentials (critical data). 

Generally S32 is having 2 options to store data: 1. using MPU module 2. using cSEC module

I am using FTFC module for protecting a portion of memory. This credential will be stored in a plain text and communicated via encryption (encryption keys is stored in cSEC module). 

Problem statement:

For the first time when I'm trying to store the data into either p-flash or d-flash I need a dedicated code for that which uses memory erase and write functions for the same. After that I am running the actual application code where I'm using those credentials. When I'm flashing the new code (application code), entire memory portion gets erased. 

How to store the credentials in some portion of memory, which won't affect even after flashing the new code??

[danielmartynek]

Hello @d_shivamkumar,

You can use the Program Once field that can't be erased, but there is only 64bytes available.

If you use a PE Micro programmer, the PE Micro Plugin in S32DS IDE allows preserving certain parts of memory during programming.

Regards,

Daniel