STM32H745 LTDC define 3 framebuffer in SDRAM

[M_R]

Hello,
I'm using STM32H745XIH(M7 side) & interfacing 1280X800 LCD-TFT with STemWin library.

In MPU_Config I've defined 2 region as NON_CACHE(8MB) and CACHE(8MB) in SDRAM(Starting address 0xC0000000).
Framebuffer define in NON_CACHE region & aGuiDataMemory define in CACHE region.

For 2 framebuffer(with ARGB8888) it works fine but some lag found in screen while transition.

So, define NUM_BUFFERS=3 in LCDConf.c, and extend the NON_CACHE region to 16MB & also define SDRAM LENGTH = 24M in linker script. Now my program crashes at run time when i try to access CACHE memory(memset aGuiDataMemory in GUI_X_Config function).
Debugging code gives Hardfault at this point.

When I change linker script CACHE start address from 0xC00000(for 2 buffer configuration) to 0x1000000(for 3 buffer configuration) program crashes as above mention.
In Build Analyzer,
2 framebuffer consumes 7.8125 MB
3 framebuffer consumes 11.71875 MB

In linker script:
MEMORY
{ 
SDRAM (xrw)      : ORIGIN = 0xC0000000, LENGTH = 24M 
}

 .sdram (NOLOAD):
  {
    _ssdram = .;

    /* 16MB NonCache */
    . = ALIGN(4);
    _ssdram_ncache = .;       /* create a global symbol at sdram start */
    *(.sdram_ncache)
    . = ALIGN(4);
    _esdram_ncache = .;       /* create a global symbol at sdram end */
        
    /* 8MB Cache */    
    . = ALIGN(4);
/*    . = 0xC00000;   Keep offset of around 4MB as per https://www.keil.com/support/docs/3777.htm */
    _ssdram_cache = .;       /* create a global symbol at sdram_gui start */
    *(.sdram_cache)
    . = ALIGN(4);
    _esdram_cache = .;       /* create a global symbol at sdram_gui end */

    _esdram = .;
  } >SDRAM

In MPU_Config:

void MPU_Config(void)
{
  MPU_Region_InitTypeDef MPU_InitStruct = {0};

  /* Disables the MPU */
  HAL_MPU_Disable();

/* DEFINE NON CACHE AREA */
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER1;
MPU_InitStruct.BaseAddress = 0xC0000000;
MPU_InitStruct.Size = MPU_REGION_SIZE_16MB; 
MPU_InitStruct.SubRegionDisable = 0x0;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL1;
MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;

HAL_MPU_ConfigRegion(&MPU_InitStruct);

  /** Initializes and configures the Region and the memory to be protected
   *  Define CACHE AREA
  */
  MPU_InitStruct.Enable = MPU_REGION_ENABLE;
  MPU_InitStruct.Number = MPU_REGION_NUMBER2;
  MPU_InitStruct.BaseAddress = 0xC1000000;
  MPU_InitStruct.Size = MPU_REGION_SIZE_8MB;
  MPU_InitStruct.SubRegionDisable = 0x0;
  MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
  MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
  MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
  MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
  MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
  MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;

  HAL_MPU_ConfigRegion(&MPU_InitStruct);

  /* Enables the MPU */
  HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}

What I am missing here?

[M_R]

Configuring Region as per MPU configuration example(Section 6.2.7) in AN4861 gives faster transition between screens, but still some glitches found in Screen transition.

Can anyone guide me on this..