[S32K312] Reading last sectors of the Program Flash region

[Mateusz_K]

I am using S32K312 MCU. I want to program/erase/read last sectors of the program flash region, but I am unable. Programming and erasing first sectors of program flash region (up to last six 8KB sectors) works fine. The problem does not appear in data flash region. I used RTD AUTOSAR 4.4 2.0.0 drivers, as well as the newset manual (Rev. 8, 01/2024). 

I have also tested few other MCUs from this family, this appears on every one of them.

Maybe this is not the place to write about it, but J-Flash also does not support last 48KB of the program flash region. 

What is the cause? Am I missing some flash unlocking mechanism? 

[Senlent · Accepted solution]

Hi@Mateusz_K

    For S32K3 series, two blocks of 1MB for program code.Inside blocks of 1 MB we have some regions that are protected by HSE core and are not accessible by the application core.

[Mateusz_K]

Thank you for swift reply,

So I understand that this sectors contain firmware which is developed by NXP, and cannot be modified by user?

[Senlent]

Hi@Mateusz_K

Yes, this sector is reserved for HSE firmware related use.

[Mateusz_K]

Thank you again,

Is the number of sectors / memory size devoted to HSE firmware constant among the S32K3 series?

[Senlent]

Hi@Mateusz_K

take a look at this post which explained more in detail.

https://community.nxp.com/t5/S32K/S32K3XX-HSE-Firmware/td-p/1787202

[Mateusz_K]

Reading done via DAP ARM through third party tool also gives false results.