79 lines
2.2 KiB
YAML
79 lines
2.2 KiB
YAML
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# Copyright (C) 2020 Nordic Semiconductor ASA
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# SPDX-License-Identifier: Apache-2.0
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description: |
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Description of pre-defined file systems.
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compatible: "zephyr,fstab,littlefs"
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include: "zephyr,fstab-common.yaml"
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properties:
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# num-files and num-dirs are not filesystem-specific.
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read-size:
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type: int
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required: true
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description: |
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The size of file system read operations, in bytes.
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All read operations will be a multiple of this value. A
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reasonable default is 16.
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This corresponds to CONFIG_FS_LITTLEFS_READ_SIZE.
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prog-size:
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type: int
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required: true
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description: |
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The size of file system program (write) operations, in bytes.
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All program operations will be a multiple of this value. A
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reasonable default is 16.
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This corresponds to CONFIG_FS_LITTLEFS_PROG_SIZE.
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cache-size:
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type: int
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required: true
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description: |
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The size of block caches, in bytes.
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Each cache buffers a portion of a block in RAM. The littlefs
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needs a read cache, a program cache, and one additional cache per
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file. Larger caches can improve performance by storing more data
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and reducing the number of disk accesses. Must be a multiple of
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the read and program sizes of the underlying flash device, and a
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factor of the block size.
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A reasonable default is 64.
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This corresponds to CONFIG_FS_LITTLEFS_CACHE_SIZE.
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lookahead-size:
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type: int
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required: true
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description: |
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The size of the lookahead buffer, in bytes.
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A larger lookahead buffer increases the number of blocks found
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during an allocation pass. The lookahead buffer is stored as a
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compact bitmap, so each byte of RAM can track 8 blocks. Must be a
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multiple of 8.
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A reasonable default is 32.
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This corresponds to CONFIG_FS_LITTLEFS_LOOKAHEAD_SIZE.
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block-cycles:
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type: int
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required: true
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description: |
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The number of erase cycles before moving data to another block.
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For dynamic wear leveling, the number of erase cycles before data
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is moved to another block. Set to a non-positive value to disable
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leveling.
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This corresponds to CONFIG_FS_LITTLEFS_LOOKAHEAD_SIZE.
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