topic Stuck in Reset in S32M

Stuck in Reset

Satyajit_Patil — Tue, 01 Jul 2025 06:19:11 GMT

I have been working with S32M24x EVB and the controller is stuck in reset. I am using on board debugger.
I could see the reset led is high always and I am unable to flash anything in the controller.

I am using design studio and I have tried by enabling "attach to running target", the on board debugger is able to attack but could not halt or reset, after some time the attachment also seem to be breaking.

I tried by directly using the "arm-none-eabi-gdb.exe" and it says the device is secured and soft reset failed.

I have also checked the hw and no component is damaged.

The flash config words in the running program are -

.section .flash_config, "a" .long 0xFFFFFFFF ; 8 bytes backdoor comparison key .long 0xFFFFFFFF ; .long 0xFFFFFFFF ; 4 bytes program flash protection bytes .long 0xFFFF7FFE ; FDPROT:FEPROT:FOPT:FSEC(0xFE = unsecured)

and the flash section is -

MEMORY { int_flash_config : ORIGIN = 0x00000400, LENGTH = 0x00000010 } SECTIONS { .flash_config ALIGN(4) : > int_flash_config }

What would be the possible cause of this situation and ways to get the controller properly working again?

Thanks in advance!!!

Re: Stuck in Reset

VaneB — Wed, 02 Jul 2025 18:03:50 GMT

Hi @Satyajit_Patil

Could you please check the reset signal using an oscilloscope? Measure the reset pin directly and share an image of the waveform you observe. We expect to see a signal similar to the one attached, with the reset line toggling as shown.

Additionally, could you try a process that has worked for me and other customers experiencing similar behavior? To re-flash your MCU, keep the reset button pressed while trying to flash it with a blink example. It might fail and ask if you want to retry. When that happens, release the reset button and then try again to load the program under that prompt. After doing this, the program should load successfully and the board should recover.

If the issue persists after trying the steps above, please let me know.

BR, VaneB

Re: Stuck in Reset

Satyajit_Patil — Mon, 12 Jan 2026 10:52:27 GMT

The issue occurred because flash config words were cleared in startup.