STM32H745: shared memory with different content on different cores

[Hansel]

In debug mode, I see the following on CM7:

 

At the same time I see the following on CM4:

 

How is this possible if I have turned cacheability off?

MPU_Region_InitTypeDef MPU_InitStruct;
 
/* Disable MPU */
HAL_MPU_Disable();
 
// Configure SRAM2 as non-cacheable
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.BaseAddress = 0x30020000;  // SRAM2
MPU_InitStruct.Size = MPU_REGION_SIZE_128KB;
MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER1;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
MPU_InitStruct.SubRegionDisable = 0x00;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
 
/* Enable MPU */
HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);

[Hansel]

How do you dump the settings? Is this something CubeIDE offers or are you talking about a specific way of doing this?

[Piranha]

To potentially improve the performance, read this topic:

https://community.st.com/s/question/0D53W00001Z9K9TSAV/maintaining-cpu-data-cache-coherence-for-dma-buffers

And, related to memory types, this one:

https://community.st.com/s/question/0D50X0000C4Nk4GSQS/bug-missing-compiler-and-cpu-memory-barriers