When using pico-vfs, there are several limitations and behavior specifics that users should be aware of. These limitations are particularly important when performing multicore operations.
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Multiple Open Instances: The current implementations of littlefs and FatFs do not support opening the same file multiple times simultaneously12. This limitation can affect scenarios where multiple accesses to the same file are required concurrently.
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Access to on-board flash from
core1: When operating file systems using the onboard flash block device oncore1, it is necessary to run the operations from RAM3. -
Access on-board flash in FreeRTOS: To access the flash device, the firmware must be stored in RAM or run with
#define configNUMBER_OF_CORES 1. -
Memory maped IO:
mmapsystem call not supported. -
Max File Size for FAT: The maximum single file size of a FAT file system depends on the capacity of the storage medium. Check the size of the SD card used and the type of FAT (FAT16/32/ExFat) automatically assigned.
We recommend reviewing these limitations before designing systems that heavily rely on multicore operations or require high file access availability.