topic Re: Unreliable R52 Core Boot on S32Z2 EVB – Requires Multiple Power Cycles / Resets to Work in S32Z/E

Unreliable R52 Core Boot on S32Z2 EVB – Requires Multiple Power Cycles / Resets to Work

karthik_nikil — Mon, 25 May 2026 09:59:15 GMT

Hi,

I am working with the S32Z2 development board. I have successfully built, flashed, and run code on the Cortex-M33 core without any issues.

However, when I try to run the same type of application (e.g., a simple LED blink) on the Cortex-R52 core, I am facing a very unreliable startup behavior.

The R52 project does not work properly on the first attempt.
It requires several power toggles, ON/OFF cycles, or board resets before it works.
Even after these attempts, it only runs successfully one or two times before failing again.
When it fails, there is no output, and the LED does not blink.

Please guide me on how to achieve reliable, consistent booting of the R52 core on the S32Z2 EVB. Any insight into the root cause of this "reset-dependent" behaviour would be greatly appreciated.

Thank you in advance for your support.

BR,

Karthik

Re: Unreliable R52 Core Boot on S32Z2 EVB – Requires Multiple Power Cycles / Resets to Work

Joey_z — Mon, 25 May 2026 10:39:38 GMT

Hi,karthik_nikil

Thank you for contacting us.

As my understand, you want to boot R52 directly on S32Z2 EVB, you can try to refer to the contents as the following link. It is the similar using with your application.

Guidance for IVT Flash Image Creation for R52_0_0 Core on S32Z280-594EVB Without Debug Probe.

Also, if you still have any issue after referring the contents, you can contact me at any time, I will support you do my best.

Joey

Re: Unreliable R52 Core Boot on S32Z2 EVB – Requires Multiple Power Cycles / Resets to Work

AdamH_work — Wed, 10 Jun 2026 13:05:25 GMT

I have been running into the same issue. We are using the S32ZE2 evaluation board. I have flashed my binary to the integrated QSPI flash and configured the RCON/BOOTMOD pins appropriately. It is unreliable, it will boot fine some times but not others. On the EVB, switching on the 12V power has maybe a 30% success rate in actually booting right away (my bootloader code turns on the LED). Pressing the reset button will allow it to boot properly if it did not boot on power up.

We have also just received our first custom designed PCBs which have the S32Z2 chip on them. These have an external QSPI. We've worked through the RCON/BOOTMOD wiring and are running into the same issue now. I have to power cycle the board multiple times before it attempts to boot at all (indicated by lighting LEDs).

Re: Unreliable R52 Core Boot on S32Z2 EVB – Requires Multiple Power Cycles / Resets to Work

Joey_z — Fri, 12 Jun 2026 05:02:24 GMT

Hi,AdamH_work

Thank you for contacting us.

You can post your issue in this link:Home

Then, I will help you to check it.

Joey