topic Re: Script to Unlock JTAG via Trace32 in S32K

Script to Unlock JTAG via Trace32

NileshDharap — Tue, 16 Sep 2025 12:00:44 GMT

Hello Team,

I am working on S32K3x controller. I will be locking the JTAG using HSE with a key.

I am looking for a script which will do the following things when I connect to Trace32

1. The script checks if Debug interface is locked.
2. If yes, read PW from password.txt (some file).
3. Attach command to unlock JTAG.

I saw almost all the queries here, either it uses some external application or accesses JTAG Port directly to unlock it (S32_JTAG_WRITE.cmm). I am not sure whether it works when JTAG is locked via HSE. I suspect it doesn't.
I haven't tried any since I don't want to brick by controller.

Can someone help here please, I'll provide any other info if needed.

Thanks in advance.
Nilesh

Re: Script to Unlock JTAG via Trace32

NileshDharap — Tue, 16 Sep 2025 12:04:28 GMT

Also, I used to perform Unlocking with the below command for MPC5476C controller

sys.option.KEYCODE 0x11111111 0x22222222 0x33333333 0x44444444 0x55555555 0x66666666 0x77777777 0x88888888.

Will it work the same as for S32K3 as well? That would be also helpful to know

Re: Script to Unlock JTAG via Trace32

davidtosenovjan — Wed, 17 Sep 2025 08:31:12 GMT

No, as I know it cannot be used this simple way.

I have recently tested it with scripts I am attaching.

Hope it helps

Re: Script to Unlock JTAG via Trace32

NileshDharap — Wed, 17 Sep 2025 10:07:58 GMT

Thanks, I will check and let you know