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- # Copyright (c) 2019 Bolt Innovation Management, LLC
- # Copyright (c) 2019 Peter Bigot Consulting, LLC
- # Copyright (c) 2020 Nordic Semiconductor ASA
- # SPDX-License-Identifier: Apache-2.0
- config FILE_SYSTEM_LITTLEFS
- bool "LittleFS support"
- depends on FILE_SYSTEM
- depends on FLASH
- help
- Enables LittleFS file system support.
- if FILE_SYSTEM_LITTLEFS
- menu "LittleFS Settings"
- visible if FILE_SYSTEM_LITTLEFS
- config FS_LITTLEFS_NUM_FILES
- int "Maximum number of opened files"
- default 4
- help
- This is a global maximum across all mounted littlefs filesystems.
- config FS_LITTLEFS_NUM_DIRS
- int "Maximum number of opened directories"
- default 4
- help
- This is a global maximum across all mounted littlefs filesystems.
- config FS_LITTLEFS_READ_SIZE
- int "Minimum size of a block read"
- default 16
- help
- All read operations will be a multiple of this value.
- config FS_LITTLEFS_PROG_SIZE
- int "Minimum size of a block program"
- default 16
- help
- All program operations will be a multiple of this value.
- config FS_LITTLEFS_CACHE_SIZE
- int "Size of block caches in bytes"
- default 64
- help
- Each cache buffers a portion of a block in RAM. The littlefs
- needs a read cache, a program cache, and one additional cache
- per file. Larger caches can improve performance by storing
- more data and reducing the number of disk accesses. Must be a
- multiple of the read and program sizes of the underlying flash
- device, and a factor of the block size.
- config FS_LITTLEFS_LOOKAHEAD_SIZE
- int "Size of lookahead buffer in bytes"
- default 32
- help
- A larger lookahead buffer increases the number of blocks found
- during an allocation pass. The lookahead buffer is stored as a
- compact bitmap, so each byte of RAM can track 8 blocks. Must
- be a multiple of 8.
- config FS_LITTLEFS_BLOCK_CYCLES
- int "Number of erase cycles before moving data to another block"
- default 512
- help
- For dynamic wear leveling, the number of erase cycles before data
- is moved to another block. Set to a non-positive value to
- disable leveling.
- config FS_LITTLEFS_BLOCK_SIZE
- int "Size of an erasable block"
- default 4096
- help
- Must be a multiple of the read and program sizes.
- endmenu
- config FS_LITTLEFS_FC_HEAP_SIZE
- int "Enable flexible file cache sizes for littlefs"
- default 0
- help
- littlefs requires a per-file buffer to cache data.
- When applications customize littlefs configurations and support
- different cache sizes for different partitions this preallocation is
- inadequate as an application might require a small number of files
- using a large cache size and a larger number of files using a
- smaller cache size. In that case application should provide a
- positive value for the heap size. Be aware that there is a
- per-allocation overhead that affects how much usable space is
- present in the heap.
- If this option is set to a non-positive value the heap is sized to
- support up to FS_LITTLE_FS_NUM_FILES blocks of
- FS_LITTLEFS_CACHE_SIZE bytes.
- endif # FILE_SYSTEM_LITTLEFS
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