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[JFFS2] Add support for JFFS2-on-Dataflash devices.

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For Dataflash, can_mark_obsolete = false and the NAND write buffering
code (wbuf.c) is used.

Since the DataFlash chip will automatically erase pages when writing,
the cleanmarkers are not needed - so cleanmarker_oob = false and
cleanmarker_size = 0

DataFlash page-sizes are not a power of two (they're multiples of 528
bytes).  The SECTOR_ADDR macro (added in the previous core patch) is
replaced with a (slower) div/mod version if CONFIG_JFFS2_FS_DATAFLASH is
selected.

Signed-off-by: Andrew Victor <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Andrew Victor 2005-02-09 09:17:45 +00:00 • committed by Thomas Gleixner
commit 8f15fd55f9
9 changed files with 98 additions and 17 deletions
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7
fs/Kconfig
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@ -1084,6 +1084,13 @@ config JFFS2_FS_NOR_ECC
ECC for JFFS2. This type of flash chip is not common, however it is
available from ST Microelectronics.
config JFFS2_FS_DATAFLASH
bool "JFFS2 support for DataFlash (EXPERIMENTAL)"
depends on JFFS2_FS && EXPERIMENTAL
default n
help
This enables the experimental support for JFFS2 on DataFlash devices.
config JFFS2_COMPRESSION_OPTIONS
bool "Advanced compression options for JFFS2"
depends on JFFS2_FS