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:
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 -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。
1.ubinize支持哪些选项
Usage: ubinize [options] <ini-file>
Generate UBI images. An UBI image may contain one or more UBI volumes which
have to be defined in the input configuration ini-file. The flash
characteristics are defined via the command-line options.
-o, --output=<file name> output file name
-p, --peb-size=<bytes> size of the physical eraseblock of the flash this UBI image is created for in bytes,kilobytes (KiB), or megabytes (MiB) (mandatory parameter)
-m, --min-io-size=<bytes> minimum input/output unit size of the flash in bytes
-s, --sub-page-size=<bytes> minimum input/output unit used for UBI headers, e.g. sub-page size in case of NAND flash (equivalent to the minimum input/output unit size by default)
-O, --vid-hdr-offset=<num> offset if the VID header from start of the physical eraseblock (default is the next minimum I/O unit or sub-page after the EC header)
-e, --erase-counter=<num> the erase counter value to put to EC headers (default is 0)
-x, --ubi-ver=<num> UBI version number to put to EC headers (default is 1)
-Q, --image-seq=<num> 32-bit UBI image sequence number to use
(by default a random number is picked)
-v, --verbose be verbose
-h, --help print help message
-V, --version print program version
2.重要选项-p -m -s -O -e
-p 指定flash的物理擦除块大小
-m 指定flash的最小输入输出单元,当为nor flash时,此值应指定为1,当为nand flash时此值应指定为页面大小
-s 指定子页大小,当为nor flash时,此值应指定为1,当为nand flash时需指定此值为nand flash的子页大小
-O 指定vid header的偏移量
-e 指定放在EC头中的擦除计数器值,默认为0
ubi文件系统之1,mkfs.ubifs 制作UBIFS 镜像
原文:https://www.cnblogs.com/zxc2man/p/14073785.html