Debug a crash handled in CDAbtHandler after a call to FileX function

[SteMMo]

Hi all,

I'm working on a custom STM32MP135 SOC hosting a MMC memory. The original firmware creates some tasks by the osThreadNew() function and works correctly.

Now I'm inserting FileX module on the firmware to support a FAT fs on the MMC memory.

The firmware lauch a mmc_init() function to setup the FileX structures:

	fx_system_initialize();

	UINT status = fx_media_open(&mmc_disk,
						 MMC_MEDIA_NAME, 
						 fx_stm32_mmc_driver, 
						 (VOID *) 0x00,
						 (VOID *) media_memory, 
						 sizeof(media_memory));
	
	printf("[mmc_init] Media open status: x%x\r\n", status);
	
#if FORCE_MMC_FORMAT == 1
	status = FX_BOOT_ERROR; // 
#endif

	if (status != FX_SUCCESS)
	{
		printf("[mmc_init] Failure: x%x\r\n", status);
		
		// Se l'errore è FX_BOOT_ERROR, proviamo a formattare il media
		if (status == FX_BOOT_ERROR) {
			printf("[mmc_init] Attempting to format media...\r\n");
			status = storage_mmc_format();
			if (status != FX_SUCCESS) {
				printf("[mmc_init] Format failed: %d\r\n", status);
				return 0;
			}
			printf("[mmc_init] Media formatted successfully\r\n");
			status = fx_media_open(&mmc_disk, 
								 MMC_MEDIA_NAME, 
								 fx_stm32_mmc_driver, 
								 (VOID *) 0x00,
								 (VOID *) media_memory, 
								 sizeof(media_memory));
			
			if (status != FX_SUCCESS) {
				printf("[mmc_init] Media open after format failed: x%x\r\n", status);
				return 0;
			}
		} else {
			return 0;
		}
	}

	STORAGE_MMC_MediaInfo mmc_info;
	if (storage_mmc_get_media_info(&mmc_info) == FX_SUCCESS)
	{
		printf("[mmc_init] Media info:\r\n");
		printf("[mmc_init]   Name: '%s'\r\n", mmc_info.media_name);
		printf("[mmc_init]   Total clusters: %lu\r\n", mmc_info.total_clusters);
		printf("[mmc_init]   Total sector: %lu\r\n", (ULONG)mmc_info.total_sectors);
	}
	else
		printf("[mmc_init] Error getting media info\r\n");

	FILE_INFO file_info;
	if (storage_mmc_first_file_info(&file_info) == FX_SUCCESS)
	{
		printf("[mmc_init] First: '%s' %ld bytes\r\n", file_info.name, file_info.size);
#if 0
		while (storage_mmc_next_file_info(&file_info) == FX_SUCCESS)
		{
			printf("[mmc_init] Next: '%s' %ld bytes\r\n", file_info.name, file_info.size);
		}
#endif
		}
	else
		{
		printf("[mmc_init] Error getting first file info or no files\r\n");
	}

where:

ALIGN_32BYTES (uint32_t media_memory[FX_STM32_MMC_DEFAULT_SECTOR_SIZE / sizeof(uint32_t)]);

is a 512 bytes buffer.

So, it happens that the first call to osThreadNew() after this mmc_init function, regardless the recalled function, crashes in the CDAbtHandler function:

Its parameters are: LR= 0xcccd02B4 (useless?), FS = 5 = FSR_TRANSLATION_FAULT_FIRST.

If I comment out the storage_mmc_first_file_info(..) (only contains fx_directory_first_full_entry_find() function call) the firmware runs correctly.

The same if I call a read or write buffer from/to mmc memory.

My guess is that these functions perform a mmc access, using the related buffers, and something is wrong in there..

Note: the driver level function to read a block (fx_stm32_mmc_read_blocks) is implemented by a BSP_MMC_ReadBlocks() call instead of a BSP_MMC_ReadBlocks_DMA call).

ADDED

Moving the mmc_init call in a earlier time, I always have a crash on the osThreadNew call in the next function: this time the code is landing in CUndefHandler with parameters: opcode = 0xffffffff, state = 4, LR = 0xccccccd4.

Any idea?

Thanks!