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arch: arm: improve inline comment in _arm_mpu_config/enable

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In _arm_mpu_config provide a more detailed description of the
effect of MPU PRIVDEFENA flag when enabling the ARM MPU.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
This commit is contained in:
Ioannis Glaropoulos 2018-05-27 23:08:18 +02:00 • committed by Anas Nashif
commit dbede45dbe
1 changed files with 6 additions and 2 deletions
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8
arch/arm/core/cortex_m/mpu/arm_mpu.c
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@ -249,7 +249,9 @@ static inline int _is_user_accessible_region(u32_t r_index, int write)
void arm_core_mpu_enable(void)
{
if (arm_mpu_enabled == 0) {
/* Enable MPU */
/* Enable MPU and use the default memory map as a
* background region for privileged software access.
*/
ARM_MPU_DEV->ctrl = ARM_MPU_ENABLE | ARM_MPU_PRIVDEFENA;
arm_mpu_enabled = 1;
@ -481,7 +483,9 @@ static void _arm_mpu_config(void)
mpu_config.mpu_regions[r_index].attr);
}
/* Enable MPU */
/* Enable MPU and use the default memory map as a
* background region for privileged software access.
*/
ARM_MPU_DEV->ctrl = ARM_MPU_ENABLE | ARM_MPU_PRIVDEFENA;
arm_mpu_enabled = 1;