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88 lines
2.4 KiB
88 lines
2.4 KiB
# 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_BLOCK_CYCLES. |
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disk-version: |
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type: int |
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description: | |
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The littlefs disk version. |
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To maintain backward compatibility with existing littlefs |
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with the same major disk version. |
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The default version is LFS_DISK_VERSION.
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