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alif/mpu: Add function to set read-only bit on MRAM MPU region.

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To allow writing to MRAM region.

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George
2025-03-06 16:30:15 +11:00
parent d895a62b07
commit f83f6e7eed
2 changed files with 15 additions and 0 deletions
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11
ports/alif/mpu.c
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@@ -25,6 +25,7 @@
*/
#include "py/mpconfig.h"
#include "irq.h"
#include "mpu.h"
#include ALIF_CMSIS_H
@@ -76,3 +77,13 @@ void MPU_Load_Regions(void) {
// Load the MPU regions from the table.
ARM_MPU_Load(0, mpu_table, sizeof(mpu_table) / sizeof(ARM_MPU_Region_t));
}
void mpu_config_mram(bool read_only) {
uintptr_t atomic = disable_irq();
ARM_MPU_Disable();
MPU->RNR = MP_MPU_REGION_MRAM;
MPU->RBAR = ARM_MPU_RBAR(MRAM_BASE, ARM_MPU_SH_NON, read_only, 1, 0);
MPU->RLAR = ARM_MPU_RLAR(MRAM_BASE + MRAM_SIZE - 1, MP_MPU_ATTR_NORMAL_WT_RA);
ARM_MPU_Enable(MPU_CTRL_PRIVDEFENA_Msk | MPU_CTRL_HFNMIENA_Msk);
enable_irq(atomic);
}