.TH MKFS.JFFS2 1
.SH NAME
mkfs.jffs2 \- Create a JFFS2 filesystem image from directory
.SH SYNOPSIS
.B mkfs.jffs
[
.B -b,--big-endian
.B -l,--little-endian
]
[
.B -e,--eraseblock=SIZE
]
[
.B -s,--pagesize=SIZE
]
[
.B -p,--pad[=SIZE]
]
[
.B \-h,\-\-help
]
[
.B -v,--version
]
[
.B -r,--root
.I directory
]
[
.B -o,--output
.I image.jffs2
]
.SH DESCRIPTION
The program
.B mkfs.jffs2
creates a JFFS2 (Second Journaling Flash Filesystem) filesystem
image and writes the resulting image to the file specified by
the option
.B -o
or to the standard output by default.  The filesystem image is
created using the files and directories contained in the directory
specified by the option
.B -r
or the present directory, if the
.B -r
option is not specified.

Files to be placed into the filesystem image are compressed
using the
.B zlib
compression library.

Filesystems are created with the same endianness as the host,
unless the
.B -b
or
.B -l
options are specified.  As of 2001-04-21, the JFFS2 driver in the
Linux kernel only supported images having the same endianness as
the CPU.

It is unlikely that JFFS2 images are useful except in conjuction
with the MTD (Memory Technology Device) drivers in the Linux
kernel, since the JFFS2 filesystem driver in the kernel requires
MTD devices.
.SH OPTIONS
Options that take SIZE arguments can be specified as either
decimal (e.g., 65536), octal (0200000), or hexidecimal (0x1000).
.TP
.B -b, --big-endian
Create a big-endian JFFS2 image.  Default is to make an image
with the same endianness as the host.
.TP
.B -e, --eraseblock=SIZE
Use erase block size SIZE.  The default is 64 kB.  If you use
a erase block size different than the erase block size of the
target MTD device, JFFS2 may not perform optimally.
.TP
.B -h, --help
Display help text.
.TP
.B -l, --little-endian
Create a little-endian JFFS2 image.  Default is to make an image
with the same endianness as the host.
.TP
.B -o, --output=FILE
Write JFFS2 image to file FILE.  Default is the standard output.
.TP
.B -p, --pad[=SIZE]
Pad output to SIZE bytes with 0xFF.  If SIZE is not specified,
the output is padded to the end of the final erase block.
.TP
.B -r, -d, --root=DIR
Build filesystem from directory DIR.  The default is the current
directory.
.TP
.B -s, --pagesize=SIZE
Use page size SIZE.  The default is 4 kB.  This size is the
maximum size of a data node.
.TP
.B -v, --version
Display version information.
.SH BUGS
JFFS2 limits device major and minor numbers to 8 bits each.  Some
consider this a bug.

.B mkfs.jffs2
does not properly handle hard links in the input directory structure.
Currently, hard linked files will be expanded to multiple identical
files in the output image.
.SH AUTHORS
David Woodhouse
.br
Manual page written by David Schleef <ds@schleef.org>
.SH SEE ALSO
.BR mkfs (8),
.BR mkfs.jffs (1),
.BR fakeroot (1)