Solved
NOR flash and Ethernet interfere each other in MPU ?
Hello,
I have some strange behaviour:
After adding external flash configuration to my application, the Ethernet stopped working (no ping).
I validated that the following added code is responsible for this failure, but I don't understand why these configuration should interfere with each other:
#define NOR_BANK_ADDR ((uint32_t)0x60000000)
#define PROGRAM_TIMEOUT ((uint32_t)0x00004400) /* NOR program timeout */
#define ERASE_TIMEOUT ((uint32_t)0x00A00000) /* NOR erase timeout */
static void MPU_Config(void)
{
MPU_Region_InitTypeDef MPU_InitStruct;
/* Disable the MPU */
HAL_MPU_Disable();
/* Configure the MPU attributes as Device not cacheable
for ETH DMA descriptors */
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.BaseAddress = 0x30040000;
MPU_InitStruct.Size = MPU_REGION_SIZE_256B;
MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER0;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
MPU_InitStruct.SubRegionDisable = 0x00;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/* Configure the MPU attributes as Cacheable write through
for LwIP RAM heap which contains the Tx buffers */
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.BaseAddress = 0x30044000;
MPU_InitStruct.Size = MPU_REGION_SIZE_16KB;
MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER1;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
MPU_InitStruct.SubRegionDisable = 0x00;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/* Configure the MPU attributes as WT for NOR */
+ MPU_InitStruct.Enable = MPU_REGION_ENABLE;
+ MPU_InitStruct.BaseAddress = NOR_BANK_ADDR;
+ MPU_InitStruct.Size = MPU_REGION_SIZE_16MB;
+ MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
+ MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
+ MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
+ MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
+ MPU_InitStruct.Number = MPU_REGION_NUMBER0;
+ MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
+ 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);
}Thank you for any idea,
ran