79 lines
2.2 KiB
YAML
79 lines
2.2 KiB
YAML
# Copyright (C) 2020 Nordic Semiconductor ASA
|
|
# SPDX-License-Identifier: Apache-2.0
|
|
|
|
description: |
|
|
Description of pre-defined file systems.
|
|
|
|
compatible: "zephyr,fstab,littlefs"
|
|
|
|
include: "zephyr,fstab-common.yaml"
|
|
|
|
properties:
|
|
# num-files and num-dirs are not filesystem-specific.
|
|
|
|
read-size:
|
|
type: int
|
|
required: true
|
|
description: |
|
|
The size of file system read operations, in bytes.
|
|
|
|
All read operations will be a multiple of this value. A
|
|
reasonable default is 16.
|
|
|
|
This corresponds to CONFIG_FS_LITTLEFS_READ_SIZE.
|
|
|
|
prog-size:
|
|
type: int
|
|
required: true
|
|
description: |
|
|
The size of file system program (write) operations, in bytes.
|
|
|
|
All program operations will be a multiple of this value. A
|
|
reasonable default is 16.
|
|
|
|
This corresponds to CONFIG_FS_LITTLEFS_PROG_SIZE.
|
|
|
|
cache-size:
|
|
type: int
|
|
required: true
|
|
description: |
|
|
The size of block caches, in bytes.
|
|
|
|
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.
|
|
|
|
A reasonable default is 64.
|
|
|
|
This corresponds to CONFIG_FS_LITTLEFS_CACHE_SIZE.
|
|
|
|
lookahead-size:
|
|
type: int
|
|
required: true
|
|
description: |
|
|
The size of the lookahead buffer, in bytes.
|
|
|
|
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.
|
|
|
|
A reasonable default is 32.
|
|
|
|
This corresponds to CONFIG_FS_LITTLEFS_LOOKAHEAD_SIZE.
|
|
|
|
block-cycles:
|
|
type: int
|
|
required: true
|
|
description: |
|
|
The number of erase cycles before moving data to another block.
|
|
|
|
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.
|
|
|
|
This corresponds to CONFIG_FS_LITTLEFS_LOOKAHEAD_SIZE.
|