From 8f15fd55f9bf266139b10850947e19c4e3f4e9b7 Mon Sep 17 00:00:00 2001 From: Andrew Victor Date: Wed, 9 Feb 2005 09:17:45 +0000 Subject: [JFFS2] Add support for JFFS2-on-Dataflash devices. 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 Signed-off-by: Thomas Gleixner --- fs/Kconfig | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'fs/Kconfig') diff --git a/fs/Kconfig b/fs/Kconfig index 6a4ad4b..07835d2 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -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 -- cgit v1.1 From 2f82ce1eb637c06dfc60f095cd1891ae0ba4894c Mon Sep 17 00:00:00 2001 From: Andrew Victor Date: Wed, 9 Feb 2005 09:24:26 +0000 Subject: [JFFS2] Use a single config option for write buffer support This patch replaces the current CONFIG_JFFS2_FS_NAND, CONFIG_JFFS2_FS_NOR_ECC and CONFIG_JFFS2_FS_DATAFLASH with a single configuration option - CONFIG_JFFS2_FS_WRITEBUFFER. The only functional change of this patch is that the slower div/mod calculations for SECTOR_ADDR(), PAGE_DIV() and PAGE_MOD() are now always used when CONFIG_JFFS2_FS_WRITEBUFFER is enabled. Signed-off-by: Andrew Victor Signed-off-by: Thomas Gleixner --- fs/Kconfig | 33 +++++++++------------------------ 1 file changed, 9 insertions(+), 24 deletions(-) (limited to 'fs/Kconfig') diff --git a/fs/Kconfig b/fs/Kconfig index 07835d2..475769c 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -1063,33 +1063,18 @@ config JFFS2_FS_DEBUG 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_NAND - bool "JFFS2 support for NAND flash" +config JFFS2_FS_WRITEBUFFER + bool "JFFS2 write-buffering support" depends on JFFS2_FS - default n + default y help - This enables the support for NAND flash in JFFS2. NAND is a newer - type of flash chip design than the traditional NOR flash, with - higher density but a handful of characteristics which make it more - interesting for the file system to use. + This enables the write-buffering support in JFFS2. - Say 'N' unless you have NAND flash. - -config JFFS2_FS_NOR_ECC - bool "JFFS2 support for ECC'd NOR flash (EXPERIMENTAL)" - depends on JFFS2_FS && EXPERIMENTAL - default n - help - This enables the experimental support for NOR flash with transparent - 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. + This functionality is required to support JFFS2 on the following + types of flash devices: + - NAND flash + - NOR flash with transparent ECC + - DataFlash config JFFS2_COMPRESSION_OPTIONS bool "Advanced compression options for JFFS2" -- cgit v1.1