Seen this on two board designs, about two year different in age and many steppings of STM32H7
The H743I-EVAL and H745I-DISCO have 1Gb (128MB) of Micron QSPI flash, one as a dual die single chip, the other as two SOP16
Using the BSP code I can access the parts, both via the Read and Memory Mapped methods.
If it do a bytewise read of the entire array in memory mapped mode the first pass returns the wrong CRC32, and the second one hangs during the next read of a byte at 0x90000000. Stopping execution, it keeps falling in the Systick_Handler, and never reads any memory
If I do half the array, or 128MB - 32 bytes, I get the correct CRC, and can do it multiple times.
...
status = BSP_QSPI_EnableMemoryMappedMode();
if (status == QSPI_ERROR)
puts("QSPI Error");
else
puts("QSPI Ok");
printf("%u\n", FlashSize);
printf("CRC:%08X\n", CRC32(0xFFFFFFFF, FlashSize, (void *)0x90000000)); // Returns wrong sum
printf("CRC:%08X\n", CRC32(0xFFFFFFFF, FlashSize, (void *)0x90000000)); // Hangs
printf("CRC:%08X\n", CRC32(0xFFFFFFFF, FlashSize, (void *)0x90000000));
printf("CRC:%08X\n", CRC32(0xFFFFFFFF, FlashSize, (void *)0x90000000));
printf("CRC:%08X\n", CRC32(0xFFFFFFFF, FlashSize, (void *)0x90000000));
...
//******************************************************************************
uint32_t CRC32(uint32_t Crc, uint32_t Size, uint8_t *Buffer)
{
while(Size--)
{
static const uint32_t CrcTable[] = {
0x00000000,0x1DB71064,0x3B6E20C8,0x26D930AC,0x76DC4190,0x6B6B51F4,0x4DB26158,0x5005713C,
0xEDB88320,0xF00F9344,0xD6D6A3E8,0xCB61B38C,0x9B64C2B0,0x86D3D2D4,0xA00AE278,0xBDBDF21C };
Crc = Crc ^ (uint32_t)*Buffer++;
Crc = (Crc >> 4) ^ CrcTable[Crc & 0x0F];
Crc = (Crc >> 4) ^ CrcTable[Crc & 0x0F];
}
return(Crc);
}
//****************************************************************************
It is as if the QUADSPI state machine malfunctions in getting the end bytes, or sends something breaking the Micron parts.
134217696 <-- 32 bytes less
CRC:E741A92C <-- Works
CRC:E741A92C
CRC:E741A92C
CRC:E741A92C
CRC:E741A92C
Infinite loop...
134217697 <--- 31 bytes less
CRC:1F3DC2C7 <- First completes correctly, but then locks
134217728 <-- Whole array
CRC:C3C26772 <- First completes incorrectly, and next pass locks
READ ID (QUAD)
MT25QL 512 (DUAL BANK) / MT25TL01G
UID-0 : 44 00 2E EF 92 00 13 FA FF 26 00 DE A8 FE ED 6C
UID-1 : 44 00 2E EF 92 00 09 12 00 11 00 45 F5 FE 0A B6
Size 134217728
