diff options
| author | Damien George <damien@micropython.org> | 2025-03-06 16:30:15 +1100 |
|---|---|---|
| committer | Damien George <damien@micropython.org> | 2025-04-09 00:22:32 +1000 |
| commit | f83f6e7eed39f961ff9788814d3ee9104d3577a6 (patch) | |
| tree | ff2b61cd1853229fbdf51e54c1e0e594ae46bf5a | |
| parent | d895a62b0703d28fb2b15427760aae8a67ad666f (diff) | |
alif/mpu: Add function to set read-only bit on MRAM MPU region.
To allow writing to MRAM region.
Signed-off-by: Damien George <damien@micropython.org>
| -rw-r--r-- | ports/alif/mpu.c | 11 | ||||
| -rw-r--r-- | ports/alif/mpu.h | 4 |
2 files changed, 15 insertions, 0 deletions
diff --git a/ports/alif/mpu.c b/ports/alif/mpu.c index 471eff20a..60753674a 100644 --- a/ports/alif/mpu.c +++ b/ports/alif/mpu.c @@ -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); +} diff --git a/ports/alif/mpu.h b/ports/alif/mpu.h index 88fbe0112..1d3602941 100644 --- a/ports/alif/mpu.h +++ b/ports/alif/mpu.h @@ -24,6 +24,8 @@ * THE SOFTWARE. */ +#include <stdbool.h> + #define MP_MPU_ATTR_NORMAL_WT_RA_TRANSIENT (0) #define MP_MPU_ATTR_DEVICE_nGnRE (1) #define MP_MPU_ATTR_NORMAL_WB_RA_WA (2) @@ -37,3 +39,5 @@ #define MP_MPU_REGION_OSPI_REGISTERS (4) #define MP_MPU_REGION_OSPI0_XIP (5) #define MP_MPU_REGION_OPENAMP (6) + +void mpu_config_mram(bool read_only); |