/**
  @page CortexM_MPU Cortex-M4 MPU example started by Linux Remote Processor Framework

  @verbatim
  ******************** (C) COPYRIGHT 2019 STMicroelectronics *******************
  * @file    Cortex/CORTEXM_MPU/Remoteproc/README
  * @author  MCD Application Team
  * @brief   How to run example using Linux Remote Processor Framework
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2019 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  @endverbatim

@par Description of M4 Cube example with Linux Remote Processor Framework

When Cube firmware is running on Cortex-M4, System Clock tree and regulators(vrefbuf) are configured by Cortex-A7
Besides, clock source for each peripheral assigned to Cortex-M4 is done by Cortex-A7.


@par How to use it ?

In order to make the program work with Linux running on Cortex-A7, you must do the following :
Before running M4 Cube example, you have to
1) interrupt uboot
2) choose the right configuration to make sure that M4 resources are assigned to Linux Resource Manager driver

Then,
 - Start example using the following command: "fw_cortex_m4.sh start" under example directory installed in userfs partition
     * it will load and start firmware using Linux Remote Processor
 - Stop example using the following command: "fw_cortex_m4.sh stop" under example directory installed in userfs partition
     * it will stop firmware using Linux Remote Processor

@par Example Description
Presentation of the MPU feature. This example configures a memory area as 
privileged read-only, and attempts to perform read and write operations in
different modes.

If the access is permitted LED7 is toggling. If the access is not permitted, 
a memory management fault is generated and LED7 is ON.

To generate an MPU memory fault exception due to an access right error, uncomment
the following line "PrivilegedReadOnlyArray[0] = 'e';" in the "stm32_mpu.c" file.


@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
      based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
      a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
      than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
      To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
      
@note The application need to ensure that the SysTick time base is always set to 1 millisecond
      to have correct HAL operation.

@par Directory contents 

  - CORTEXM/CORTEXM_MPU/Inc/stm32mp1xx_hal_conf.h    HAL configuration file
  - CORTEXM/CORTEXM_MPU/Inc/stm32mp1xx_it.h          Interrupt handlers header file
  - CortexM/CORTEXM_MPU/Inc/main.h                  Header for main.c module  
  - CortexM/CORTEXM_MPU/Inc/stm32_mpu.h             MPU management
  - CortexM/CORTEXM_MPU/Src/stm32mp1xx_it.c          Interrupt handlers
  - CortexM/CORTEXM_MPU/Src/main.c                  Main program
  - CortexM/CORTEXM_MPU/Src/system_stm32mp1xx.c      stm32mp1xx system source file
  - CortexM/CORTEXM_MPU/Src/stm32_mpu.c             MPU management

@par Hardware and Software environment

  - This example runs on STM32MP157CACx devices.
    
  - This example has been tested with STM32MP157C-DK2 board and can be
    easily tailored to any other supported device and development board.      

@par How to use it ? 

In order to make the program work, you must do the following :
 - Open your preferred toolchain
 - Rebuild all files and load your image into target memory
 - Run the example

 * <h3><center>&copy; COPYRIGHT STMicroelectronics</center></h3>
 */
