arm: soc: nxp k6x: Add Allow write on Flash

This patch adds the allow flash write CONFIG option to the NXP MPU
configuration in privileged mode.

Signed-off-by: Vincenzo Frascino <[email protected]>
Signed-off-by: David Brown <[email protected]>

Author: Vincenzo Frascino

arch/arm/core/cortex_m/mpu/Kconfig

@@ -38,3 +38,10 @@ config NXP_MPU
 	default n
 	help
 	  MCU has NXP MPU
+
+config MPU_ALLOW_FLASH_WRITE
+	bool "Add MPU access to write to flash"
+	depends on NXP_MPU
+	default n
+	help
+	  Enable this to allow MPU RWX access to flash memory

include/arch/arm/cortex_m/mpu/nxp_mpu.h

@@ -62,13 +62,25 @@
 #define ENDADDR_ROUND(x) (x - 0x1F)
 
 /* Some helper defines for common regions */
+#if defined(CONFIG_MPU_ALLOW_FLASH_WRITE)
+#define REGION_RAM_ATTR	  (MPU_REGION_READ | \
+			   MPU_REGION_WRITE | \
+			   MPU_REGION_EXEC | \
+			   MPU_REGION_SU)
+
+#define REGION_FLASH_ATTR (MPU_REGION_READ | \
+			   MPU_REGION_WRITE | \
+			   MPU_REGION_EXEC | \
+			   MPU_REGION_SU)
+#else
 #define REGION_RAM_ATTR	  (MPU_REGION_READ | \
 			   MPU_REGION_WRITE | \
 			   MPU_REGION_SU)
 
 #define REGION_FLASH_ATTR (MPU_REGION_READ | \
 			   MPU_REGION_EXEC | \
 			   MPU_REGION_SU)
+#endif
 
 #define REGION_IO_ATTR	  (MPU_REGION_READ | \
 			   MPU_REGION_WRITE | \
@@ -80,7 +92,6 @@
 
 #define REGION_DEBUG_ATTR  MPU_REGION_SU
 
-
 /* Region definition data structure */
 struct nxp_mpu_region {
 	/* Region Base Address */