stm32f7:Support CONFIG_MPU_RESET and CONFIG_ARM_MPU_EARLY_RESET

arch/arm/src/stm32f7/Make.defs

@@ -67,7 +67,7 @@ ifeq ($(CONFIG_ARMV7M_ITMSYSLOG),y)
 CMN_CSRCS += arm_itm_syslog.c
 endif
 
-ifeq ($(CONFIG_ARM_MPU),y)
+ifneq ($(filter y,$(CONFIG_ARM_MPU) $(CONFIG_ARM_MPU_EARLY_RESET)),)
 CMN_CSRCS += arm_mpu.c
 endif
 

arch/arm/src/stm32f7/stm32_mpuinit.c

@@ -70,6 +70,10 @@ void stm32_mpuinitialize(void)
 
   mpu_showtype();
 
+  /* Reset MPU if enabled */
+
+  mpu_reset();
+
   /* Configure user flash space */
 
   mpu_user_flash(USERSPACE->us_textstart,

arch/arm/src/stm32f7/stm32_start.c

@@ -35,6 +35,7 @@
 #include "arm_arch.h"
 #include "arm_internal.h"
 #include "nvic.h"
+#include "mpu.h"
 #include "barriers.h"
 
 #include "stm32_rcc.h"
@@ -261,6 +262,10 @@ void __start(void)
                    "r"(CONFIG_IDLETHREAD_STACKSIZE - 64) :);
 #endif
 
+  /* If enabled reset the MPU */
+
+  mpu_early_reset();
+
   /* Clear .bss.  We'll do this inline (vs. calling memset) just to be
    * certain that there are no issues with the state of global variables.
    */