topic Re: S32K144 change FSEC in S32K

S32K144 change FSEC

pangyun — Tue, 22 Apr 2025 07:02:56 GMT

I am developing on a S32K144 , usually in debug mode with the device unsecured.

I use S32 Design Studio for S32 Platform Version: 3.4 for developing.

The hardware is segger jlink.

In order to secure the device I set the SEC bits of FSEC reg. from "10" to "11" in the starup.S file as below .

Program the device by s32ds debug ,but I finally found the SEC bits is always 10b.

Please tell me reason and how can I program by S32DS debug with J-LINK to set the SEC bits of FSEC reg. from "10" to "11".

Re: S32K144 change FSEC

Julián_AragónM — Tue, 22 Apr 2025 22:19:55 GMT

Hi @pangyun

Please look at this community post: Solved: S32K144 Setting FSEC bits to Secure - NXP Community. It mentions the same issues, which was fixed by programming in unsecure and secure modes.

Best regards,
Julián

Re: S32K144 change FSEC

pangyun — Wed, 23 Apr 2025 00:58:45 GMT

I see that,but he used the Multilink Universal (PEMicro) to program,my device is J-LINK. So please tell me reason and how can I program by S32DS debug with J-LINK to set the SEC bits of FSEC reg. from "10" to "11".

Re: S32K144 change FSEC

Julián_AragónM — Fri, 25 Apr 2025 21:19:00 GMT

Hi @pangyun,

Are you using S32DS to flash or the J-Link tools (such as J-Flash)?

Modify the FSEC register in startup_S32K144.S file and generated a .hex file with S32DS. Then, select allow security in J-Flash, you should be able to secure it:

Best regards,
Julián