mkfs.ubifs 制作UBIFS 镜像 mkfs.ubifs的用法 Usage: mkfs.ubifs [OPTIONS] target Make a UBIFS file system image from an existing directory tree Examples: Build file system from directory /opt/img, writting the result in the ubifs.img file mkfs.ubifs -m 512 -e 128KiB -c 100 -r /opt/img ubifs.img The same, but writting directly to an UBI volume mkfs.ubifs -r /opt/img /dev/ubi0_0 Creating an empty UBIFS filesystem on an UBI volume mkfs.ubifs /dev/ubi0_0 Options:
-r, -d, --root=DIR build file system from directory DIR -m, --min-io-size=SIZE minimum I/O unit size，最小输入输出大小 -e, --leb-size=SIZE logical erase block size逻辑可擦出块大小 -c, --max-leb-cnt=COUNT maximum logical erase block count最大逻辑可擦出块数目 -o, --output=FILE output to FILE输出文件名 -j, --jrn-size=SIZE journal size -R, --reserved=SIZE how much space should be reserved for the super-user -x, --compr=TYPE compression type - "lzo", "favor_lzo", "zlib" or "none" (default: "lzo") -X, --favor-percent may only be used with favor LZO compression and defines how many percent better zlib should compress to make mkfs.ubifs use zlib instead of LZO (default 20%) -f, --fanout=NUM fanout NUM (default: 8) -F, --space-fixup file-system free space has to be fixed up on first moun (requires kernel version 3.0 or greater) -k, --keyhash=TYPE key hash type - "r5" or "test" (default: "r5") -p, --orph-lebs=COUNT count of erase blocks for orphans (default: 1) -D, --devtable=FILE use device table FILE -U, --squash-uids squash owners making all files owned by root -l, --log-lebs=COUNT count of erase blocks for the log (used only for debugging) -v, --verbose verbose operation -V, --version display version information -g, --debug=LEVEL display debug information (0 - none, 1 - statistics, 2 - files, 3 - more details) -h, --help display this help text 例：
mkfs.ubifs -x lzo -m 2KiB -e 124KiB -c 720 -o system_ubifs.img -d $path_to_system 压缩格式为lzo -m最小输入输出大小为2KiB(2048bytes)，一般为页大小 -e逻辑可擦除块大小为124KiB=(每块的页数-2)*页大小=（64-2）*2KiB=124KiB -c最多逻辑可擦除块数目为720(720*128KiB=90MiB),这个可根据ubi volume来设置，实际上是设置此卷的最大容量。
ubinize命令可将使用mkfs.ubifs命令制作的UBIFS文件系统镜像转换成可直接在FLASH上烧写的格式（带有UBI文件系统镜像卷标）： ubinize -o ubi.img-m 2048 -p 128KiB-s 512 -O 2048 ubinize.cfg ubinize.cfg为一些配置参数：
[ubifs]
mode=ubi
image=ubifs.img
vol_id=0
vol_size=100MiB
vol_type=dynamic
vol_alignment=1
vol_name=rootfs
vol_flags=autoresize
通过此命令生成的ubi.img可直接使用NAND FLASH的烧写命令烧写到FLASH上。 原文链接：https://blog.csdn.net/yexiangcsdn/article/details/81198757
