无意中看到下面一段话:
/*
* when using cacheable memory region, it may be needed to maintain the cache
* validity. Enable the define below to activate a cache maintenance at each
* read and write operation.
* Notice: This is applicable only for cortex M7 based platform.
*/
/* USER CODE BEGIN enableSDDmaCacheMaintenance */
/* #define ENABLE_SD_DMA_CACHE_MAINTENANCE 1*/
/* USER CODE END enableSDDmaCacheMaintenance */
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