FMC SDRAM conflict with LWIP configuration

[Tu Nguyen Ngoc]

Hi everyone,

I have a project using STM32H723ZG interface with SDRAM IS42S16400J (via FMC) and LAN8742. If I enable both FMC and LWIP to run with FreeRTOS, my program ends up jump to hard fault handler. If either FMC or LWIP is enabled with FreeRTOS, my program will be worked fine.

This is my MPU config. I know I have done something wrong, but I don't know what it is. Please give me some advice. Thank you in advance.

void MPU_Config(void)
{
  MPU_Region_InitTypeDef MPU_InitStruct = {0};
 
  /* Disables the MPU */
  HAL_MPU_Disable();
  /** Initializes and configures the Region and the memory to be protected
  */
  MPU_InitStruct.Enable = MPU_REGION_ENABLE;
  MPU_InitStruct.Number = MPU_REGION_NUMBER0;
  MPU_InitStruct.BaseAddress = 0x30000000;
  MPU_InitStruct.Size = MPU_REGION_SIZE_256B;
  MPU_InitStruct.SubRegionDisable = 0x0;
  MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
  MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
  MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
  MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
  MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
  MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;
 
  HAL_MPU_ConfigRegion(&MPU_InitStruct);
  /** Initializes and configures the Region and the memory to be protected
  */
  MPU_InitStruct.Number = MPU_REGION_NUMBER1;
  MPU_InitStruct.BaseAddress = 0x30004000;
  MPU_InitStruct.Size = MPU_REGION_SIZE_16KB;
  MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
  MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
 
  HAL_MPU_ConfigRegion(&MPU_InitStruct);
  /** Initializes and configures the Region and the memory to be protected
  */
  MPU_InitStruct.Enable           = MPU_REGION_ENABLE;
  MPU_InitStruct.BaseAddress      = 0x60000000;
  MPU_InitStruct.Size             = ARM_MPU_REGION_SIZE_64KB;
  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_NUMBER2;
	MPU_InitStruct.TypeExtField     = MPU_TEX_LEVEL0;
	MPU_InitStruct.SubRegionDisable = 0x00;
	MPU_InitStruct.DisableExec      = MPU_INSTRUCTION_ACCESS_ENABLE;
 
  HAL_MPU_ConfigRegion(&MPU_InitStruct);
  /** Initializes and configures the Region and the memory to be protected
  */
  /* Configure the MPU attributes of SDRAM as Write back, Read allocate, Write allocate */
	MPU_InitStruct.Enable           = MPU_REGION_ENABLE;
	MPU_InitStruct.BaseAddress      = 0xC0000000;
	MPU_InitStruct.Size             = MPU_REGION_SIZE_32MB;
	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.Number           = MPU_REGION_NUMBER3;
	MPU_InitStruct.TypeExtField     = MPU_TEX_LEVEL1;
	MPU_InitStruct.SubRegionDisable = 0x00;
	MPU_InitStruct.DisableExec      = MPU_INSTRUCTION_ACCESS_ENABLE;
 
	HAL_MPU_ConfigRegion(&MPU_InitStruct);
  /* Enables the MPU */
	HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
 
}

[Tu Nguyen Ngoc]

What do you mean by "from external SDRAM"? Do you want to allocate lwip stack/pool memory from sdram?