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stm32/sdram: Use MPU helper functions to configure MPU for SDRAM use.

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This commit is contained in:
Damien George
2019-07-03 00:48:19 +10:00
parent f7eb2c72f7
commit eca4115f66
2 changed files with 19 additions and 36 deletions
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41
ports/stm32/sdram.c
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@@ -13,6 +13,7 @@
#include "py/mphal.h"
#include "pin.h"
#include "pin_static_af.h"
#include "mpu.h"
#include "systick.h"
#include "sdram.h"
@@ -244,45 +245,13 @@ static void sdram_init_seq(SDRAM_HandleTypeDef
#if defined(STM32F7)
/* Enable MPU for the SDRAM Memory Region to allow non-aligned
accesses (hard-fault otherwise)
*/
MPU_Region_InitTypeDef MPU_InitStruct;
/* Disable the MPU */
HAL_MPU_Disable();
/* Configure the MPU attributes for External SDRAM
Initially disable all access for the entire SDRAM memory space,
then enable access/caching for the size used
*/
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER4;
MPU_InitStruct.BaseAddress = SDRAM_START_ADDRESS;
MPU_InitStruct.Size = MPU_REGION_SIZE_512MB;
MPU_InitStruct.AccessPermission = MPU_REGION_NO_ACCESS;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
MPU_InitStruct.SubRegionDisable = 0x00;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER5;
MPU_InitStruct.BaseAddress = SDRAM_START_ADDRESS;
MPU_InitStruct.Size = SDRAM_MPU_REGION_SIZE;
MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL1;
MPU_InitStruct.SubRegionDisable = 0x00;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/* Enable the MPU */
HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
mpu_config_start();
mpu_config_region(MPU_REGION_SDRAM1, SDRAM_START_ADDRESS, MPU_CONFIG_DISABLE(0x00, MPU_REGION_SIZE_512MB));
mpu_config_region(MPU_REGION_SDRAM2, SDRAM_START_ADDRESS, MPU_CONFIG_SDRAM(SDRAM_MPU_REGION_SIZE));
mpu_config_end();
#endif
}