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SW4STM32 and SW4Linux fully supports the STM32MP1 asymmetric multicore Cortex/A7+M4 MPUs

   With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world. And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4.
You can get more information from the ac6-tools website and download (registration required) various documents highlighting:

System Workbench for STM32


Memory Protection Unit not working

uiUART_CountThe processor is an STM32F373VCT

The below code does not cause the desired memfault when uiUART_Count is written to.


volatile unsigned int attribute ((aligned int)) uiUART_Count = 0;

// Located among the first lines in main():
SCB->SHCSR |= SCB_SHCSR_USGFAULTENA_Pos | SCB_SHCSR_BUSFAULTENA_Pos | SCB_SHCSR_MEMFAULTENA_Pos;
MPU_Region_InitTypeDef MPU_Init =
{
.Enable = SET,
.Number = 0,
.BaseAddress = (uint32_t)&uiUART_Count,
.Size = 4, // This is 32 Bytes, the minimum possible.
.SubRegionDisable = 0,
.TypeExtField = 0,
.AccessPermission = 0b110,
.DisableExec = 0,
.IsShareable = 1,
.IsCacheable = 1,
.IsBufferable = 0
};
// Align BaseAddress on 32 byte boundaries.
MPU_Init.BaseAddress &= (~(uint32_t)0) < < ( MPU_Init.Size + 1 );
HAL_MPU_ConfigRegion( &MPU_Init);


The below line of code did not cause a call to MemManage_Handler() as expected:

uiUART_Count++;

The address if uiUART_Count is 0x200007cc
The value of MPU_Init.BaseAddress is 0x200007c0

Something is overwriting the value of uiUART_Count and others. I am attempting to use the MPU find out where in the code it is being overwritten. I need to know why this is not working.