config JFFS_FS
tristate "Journalling Flash File System (JFFS) support"
depends on MTD
help
JFFS is the Journaling Flash File System developed by Axis
Communications in Sweden, aimed at providing a crash/powerdown-safe
file system for disk-less embedded devices. Further information is
available at ().
config JFFS_FS_VERBOSE
int "JFFS debugging verbosity (0 = quiet, 3 = noisy)"
depends on JFFS_FS
default "0"
help
Determines the verbosity level of the JFFS debugging messages.
config JFFS_PROC_FS
bool "JFFS stats available in /proc filesystem"
depends on JFFS_FS && PROC_FS
help
Enabling this option will cause statistics from mounted JFFS file systems
to be made available to the user in the /proc/fs/jffs/ directory.
config JFFS2_FS
tristate "Journalling Flash File System v2 (JFFS2) support"
select CRC32
depends on MTD
help
JFFS2 is the second generation of the Journalling Flash File System
for use on diskless embedded devices. It provides improved wear
levelling, compression and support for hard links. You cannot use
this on normal block devices, only on 'MTD' devices.
Further information on the design and implementation of JFFS2 is
available at .
config JFFS2_FS_DEBUG
int "JFFS2 debugging verbosity (0 = quiet, 2 = noisy)"
depends on JFFS2_FS
default "0"
help
This controls the amount of debugging messages produced by the JFFS2
code. Set it to zero for use in production systems. For evaluation,
testing and debugging, it's advisable to set it to one. This will
enable a few assertions and will print debugging messages at the
KERN_DEBUG loglevel, where they won't normally be visible. Level 2
is unlikely to be useful - it enables extra debugging in certain
areas which at one point needed debugging, but when the bugs were
located and fixed, the detailed messages were relegated to level 2.
If reporting bugs, please try to have available a full dump of the
messages at debug level 1 while the misbehaviour was occurring.
config JFFS2_FS_WRITEBUFFER
bool "JFFS2 write-buffering support"
depends on JFFS2_FS
default y
help
This enables the write-buffering support in JFFS2.
This functionality is required to support JFFS2 on the following
types of flash devices:
- NAND flash
- NOR flash with transparent ECC
- DataFlash
config JFFS2_SUMMARY
bool "JFFS2 summary support (EXPERIMENTAL)"
depends on JFFS2_FS && EXPERIMENTAL
default n
help
This feature makes it possible to use summary information
for faster filesystem mount.
The summary information can be inserted into a filesystem image
by the utility 'sumtool'.
If unsure, say 'N'.
config JFFS2_COMPRESSION_OPTIONS
bool "Advanced compression options for JFFS2"
depends on JFFS2_FS
default n
help
Enabling this option allows you to explicitly choose which
compression modules, if any, are enabled in JFFS2. Removing
compressors and mean you cannot read existing file systems,
and enabling experimental compressors can mean that you
write a file system which cannot be read by a standard kernel.
If unsure, you should _definitely_ say 'N'.
config JFFS2_ZLIB
bool "JFFS2 ZLIB compression support" if JFFS2_COMPRESSION_OPTIONS
select ZLIB_INFLATE
select ZLIB_DEFLATE
depends on JFFS2_FS
default y
help
Zlib is designed to be a free, general-purpose, legally unencumbered,
lossless data-compression library for use on virtually any computer
hardware and operating system. See for
further information.
Say 'Y' if unsure.
config JFFS2_RTIME
bool "JFFS2 RTIME compression support" if JFFS2_COMPRESSION_OPTIONS
depends on JFFS2_FS
default y
help
Rtime does manage to recompress already-compressed data. Say 'Y' if unsure.
config JFFS2_RUBIN
bool "JFFS2 RUBIN compression support" if JFFS2_COMPRESSION_OPTIONS
depends on JFFS2_FS
default n
help
RUBINMIPS and DYNRUBIN compressors. Say 'N' if unsure.
choice
prompt "JFFS2 default compression mode" if JFFS2_COMPRESSION_OPTIONS
default JFFS2_CMODE_PRIORITY
depends on JFFS2_FS
help
You can set here the default compression mode of JFFS2 from
the available compression modes. Don't touch if unsure.
config JFFS2_CMODE_NONE
bool "no compression"
help
Uses no compression.
config JFFS2_CMODE_PRIORITY
bool "priority"
help
Tries the compressors in a predefinied order and chooses the first
successful one.
config JFFS2_CMODE_SIZE
bool "size (EXPERIMENTAL)"
help
Tries all compressors and chooses the one which has the smallest
result.
endchoice
config JFFS3_FS
tristate "Journalling Flash File System v3 (JFFS3) support (EXPERIMENTAL)"
select CRC32
depends on MTD
help
JFFS3 is the third generation of the Journalling Flash File System
for use on diskless embedded devices. It provides improved wear
levelling, compression and support for hard links. You cannot use
this on normal block devices, only on 'MTD' devices.
config JFFS3_FS_DEBUG
int "JFFS3 debugging verbosity (0 = quiet, 2 = noisy)"
depends on JFFS3_FS
default "0"
help
This controls the amount of debugging messages produced by the JFFS3
code. Set it to zero for use in production systems. For evaluation,
testing and debugging, it's advisable to set it to one. This will
enable a few assertions and will print debugging messages at the
KERN_DEBUG loglevel, where they won't normally be visible. Level 2
is unlikely to be useful - it enables extra debugging in certain
areas which at one point needed debugging, but when the bugs were
located and fixed, the detailed messages were relegated to level 2.
If reporting bugs, please try to have available a full dump of the
messages at debug level 1 while the misbehaviour was occurring.
config JFFS3_FS_WRITEBUFFER
bool "JFFS3 write-buffering support"
depends on JFFS3_FS
default y
help
This enables the write-buffering support in JFFS3.
This functionality is required to support JFFS3 on the following
types of flash devices:
- NAND flash
- NOR flash with transparent ECC
- DataFlash
config JFFS3_SUMMARY
bool "JFFS3 summary support (EXPERIMENTAL)"
depends on JFFS3_FS
default n
help
This feature makes it possible to use summary information
for faster filesystem mount - specially on NAND.
The summary information can be inserted into a filesystem image
by the utility 'sumtool'.
If unsure, say 'N'.
config JFFS3_COMPRESSION_OPTIONS
bool "Advanced compression options for JFFS3"
default n
help
Enabling this option allows you to explicitly choose which
compression modules, if any, are enabled in JFFS3. Removing
compressors and mean you cannot read existing file systems,
and enabling experimental compressors can mean that you
write a file system which cannot be read by a standard kernel.
If unsure, you should _definitely_ say 'N'.
config JFFS3_ZLIB
bool "JFFS3 ZLIB compression support" if JFFS3_COMPRESSION_OPTIONS
select ZLIB_INFLATE
select ZLIB_DEFLATE
depends on JFFS3_FS
default y
help
Zlib is designed to be a free, general-purpose, legally unencumbered,
lossless data-compression library for use on virtually any computer
hardware and operating system. See http://www.gzip.org/zlib/ for
further information.
Say 'Y' if unsure.
config JFFS3_RTIME
bool "JFFS3 RTIME compression support" if JFFS3_COMPRESSION_OPTIONS
depends on JFFS3_FS
default y
help
Rtime does manage to recompress already-compressed data. Say 'Y' if unsure.
config JFFS3_RUBIN
bool "JFFS3 RUBIN compression support" if JFFS3_COMPRESSION_OPTIONS
depends on JFFS3_FS
default n
help
RUBINMIPS and DYNRUBIN compressors. Say 'N' if unsure.
choice
prompt "JFFS3 default compression mode" if JFFS3_COMPRESSION_OPTIONS
default JFFS3_CMODE_PRIORITY
depends on JFFS3_FS
help
You can set here the default compression mode of JFFS3 from
the avaiable compression modes. Don't touch if unsure.
config JFFS3_CMODE_NONE
bool "no compression"
help
Uses no compression.
config JFFS3_CMODE_PRIORITY
bool "priority"
help
Tries the compressors in a predefinied order and chooses the first
successful one.
config JFFS3_CMODE_SIZE
bool "size"
help
Tries all compressors and chooses the one which has the smallest
result.
endchoice