Micron QSPI Nonvolatile Config register Write not working.

Hi Everyone, I am using STM32H757I-EVAL board and the onboard Twin Quad SPI Nor Flash ( MT25QL512ABB8ESF-0SIT ). I have configured QSPI to operate in DUAL Flash mode.

I am able to perform memory read, memory write, memory erase, and internal configuration register read operation from/to QSPI flash.

But, When I try to update NonVolatile configuration register, It fails to update it.

If I change my QSPI memory configuration from Dual Flash mode to Singal flash mode, It works for Flash-1.

So, Is there anything that I am missing for the Dual Flash Mode?

I am enabling Write Latch before write Operation.

As per the technical notes for STM32H757i_EVAL board, both flash needs to have an ideal configuration.

Here is the code snippet

int32_t WriteNonVolatileConfigurationRegister( QSPI_HandleTypeDef *Ctx, Interface_t Mode, uint8_t *pData )
{
 QSPI_CommandTypeDef s_command;
 
 /* Initialize the command */
 s_command.InstructionMode = QSPI_INSTRUCTION_4_LINES;
 s_command.Instruction = WRITE_NONVOL_CFG_REG_CMD;		// 0xB1
 s_command.AddressMode = QSPI_ADDRESS_NONE;
 s_command.DataMode = QSPI_DATA_4_LINES;
 s_command.AlternateByteMode = QSPI_ALTERNATE_BYTES_NONE;
 s_command.DummyCycles = 0;
 s_command.NbData = 4;	// QSPI_DUALFLASH_ENABLE = 0x04, QSPI_DUALFLASH_DISABLE = 0x02
 
 s_command.DdrMode = QSPI_DDR_MODE_DISABLE;
 s_command.DdrHoldHalfCycle = QSPI_DDR_HHC_ANALOG_DELAY;
 s_command.SIOOMode = QSPI_SIOO_INST_EVERY_CMD;
 
 /*write enable */
 if( WriteEnable(Ctx, QPI_MODE)!= OK)
 {
 return ERROR_COMMAND;
 }
 
 /* Send the command */
 if (HAL_QSPI_Command(Ctx, &s_command, HAL_QPSI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
 {
 return ERROR_COMMAND;
 }
 
 if (HAL_QSPI_Transmit( Ctx, pData, HAL_QPSI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
 {
 return ERROR_TRANSMIT;
 }
 
 /* Configure automatic polling mode to wait the memory is ready */
 if( AutoPollingMemReady(Ctx, QPI_MODE)!= OK)
 {
 return ERROR_COMMAND;
 }
 
 return OK;
}