QSPI fail on memory mapped read after DMA page programm

Hi

We are facing a problem while trying to read data out of QSPI flash in memory mapped mode shortly after programming a page in DMA mode. We see that the read data is corrupted / unexpected altough flash hast he correct data.

Our steps to reproduce the issue :

• Update a data in one sector
  • Erasing a sector (4 KBYtes) by
    • Entering write mode (HAL_QSPI_Command/QSPI_CMD_WRITE_ENABLE (0x06))
    • Send erase command (HAL_QSPI_Command/QSPI_BlockErase_4k (0x20))
    • Wait for reading status register (HAL_QSPI_Command/QSPI_CMD_READ_STATUS_REG1 (0x05), HAL_QSPI_Receive) doesn’t have QSPI_REGISTER_WIP set (bit 0).
  • Writing just a single page (256Bytes)
    • HAL_QSPI_Command_IT /QSPI_CMD_PAGE_PROGRAM (0x02)
    • HAL_QSPI_Transmit_DMA (data)
    • On transfer complete a callback is triggered from the interrupt
• Enable memory mapped mode and read the data
  • Apply Errata suggestions (STM32L471xx Errata sheet , 2.6.5 Wrong data can be read in memory-mapped after an indirect mode operation)
  • Enter memory mapped mode HAL_QSPI_MemoryMapped/QSPI_CMD_FAST_READ (0x0B)
  • Copy data from a memory mapped region. The red buffer contains unexpected values.

Observations :

• QUADSPI_CCR FMODE indicates indirect write mode before entering memory mapped mode (so according to errata suggestions we are resetting QUADSPI_AR to 0.
• If we add significant delay before going to memory mapped mode (~2000 NOPs), then the red data is correct
• If we don’t use DMA to write, it’s also OK
• In case of failure we see that we receive transfer complete indication before we try to switch to memory mapped mode (also protected by a mutex)

Do you have any suggestions how we can proceed and what we could check next to resolve this problem?

THX, Daniel

PS:

CPU: STM32L4A6VG

STM32L4xx HAL version: 1.8.3 (from STM32Cube_FW_L4_V1.12.0)