S32K322 MPU MemManage handler Exception Not Reaching

[Thiru2483]

Hi Team,

I have configured the MPU memory partition.

I created a stub function to intentionally violate the SRAM address region.

Initially, I configured both read and write access to the SRAM region. After changing the region permissions to read-only and attempting to write to the TEST_SRAM_ADDRESS, a MemFault is triggered, and the location is updated as expected. However, it is entering the HardFault handler instead of the MemManage handler. I have attached the image below for your reference withe register details.

I have added the MCAL MPU option enabled similar is done for core 1.

Kindly let me know why this is happening and whether I am missing any configuration. Please provide your support on this.

S32K3

[danielmartynek]

Hi @Thiru2483,

The root cause could be that another fault occurs during exception entry or stack usage. Even with MEMFAULTENA enabled, if the MPU violation happens while the core is stacking/unstacking registers (for example, when the stack pointer lies in or grows into a restricted SRAM MPU region), the Cortex‑M7 will force escalation directly to HardFault. In that case, MemManage_Handler is never entered. Is the stack located in the same SRAM region that you are restricting with the MPU?

Regards,

Daniel