config YAFFS_FS
tristate "YAFFS2 file system support"
default n
- depends on MTD
+ depends on MTD_BLOCK
select YAFFS_YAFFS1
select YAFFS_YAFFS2
help
YAFFS2, or Yet Another Flash Filing System, is a filing system
optimised for NAND Flash chips.
- To compile the YAFFS2 file system support as a module, choose M here:
- the module will be called yaffs2.
+ To compile the YAFFS2 file system support as a module, choose M
+ here: the module will be called yaffs2.
If unsure, say N.
help
Enable YAFFS1 support -- yaffs for 512 byte / page devices
+ Not needed for 2K-page devices.
+
If unsure, say Y.
+config YAFFS_9BYTE_TAGS
+ bool "Use older-style on-NAND data format with pageStatus byte"
+ depends on YAFFS_YAFFS1
+ default n
+ help
+
+ Older-style on-NAND data format has a "pageStatus" byte to record
+ chunk/page state. This byte is zero when the page is discarded.
+ Choose this option if you have existing on-NAND data using this
+ format that you need to continue to support. New data written
+ also uses the older-style format. Note: Use of this option
+ generally requires that MTD's oob layout be adjusted to use the
+ older-style format. See notes on tags formats and MTD versions
+ in yaffs_mtdif1.c.
+
+ If unsure, say N.
+
config YAFFS_DOES_ECC
bool "Lets Yaffs do its own ECC"
- depends on YAFFS_FS && YAFFS_YAFFS1
+ depends on YAFFS_FS && YAFFS_YAFFS1 && !YAFFS_9BYTE_TAGS
default n
help
This enables Yaffs to use its own ECC functions instead of using
config YAFFS_ECC_WRONG_ORDER
bool "Use the same ecc byte order as Steven Hill's nand_ecc.c"
- depends on YAFFS_FS && YAFFS_DOES_ECC
+ depends on YAFFS_FS && YAFFS_DOES_ECC && !YAFFS_9BYTE_TAGS
default n
help
- This makes yaffs_ecc.c use the same ecc byte order as
- Steven Hill's nand_ecc.c. If not set, then you get the
- same ecc byte order as SmartMedia.
+ This makes yaffs_ecc.c use the same ecc byte order as Steven
+ Hill's nand_ecc.c. If not set, then you get the same ecc byte
+ order as SmartMedia.
If unsure, say N.
depends on YAFFS_FS
default y
help
- Enable YAFFS2 support -- yaffs for >= 2048 byte / page larger devices
+ Enable YAFFS2 support -- yaffs for >= 2K bytes per page devices
If unsure, say Y.
help
Without this, you need to explicitely use yaffs2 as the file
system type. With this, you can say "yaffs" and yaffs or yaffs2
- will be used depending on the device page size.
+ will be used depending on the device page size (yaffs on
+ 512-byte page devices, yaffs2 on 2K page devices).
If unsure, say Y.
+config YAFFS_DISABLE_TAGS_ECC
+ bool "Disable YAFFS from doing ECC on tags by default"
+ depends on YAFFS_FS && YAFFS_YAFFS2
+ default n
+ help
+ This defaults Yaffs to using its own ECC calculations on tags instead of
+ just relying on the MTD.
+ This behavior can also be overridden with tags_ecc_on and
+ tags_ecc_off mount options.
+
+ If unsure, say N.
+
config YAFFS_DISABLE_LAZY_LOAD
bool "Disable lazy loading"
depends on YAFFS_YAFFS2
If unsure, say N.
-config YAFFS_CHECKPOINT_RESERVED_BLOCKS
- int "Reserved blocks for checkpointing"
- depends on YAFFS_YAFFS2
- default 10
- help
- Give the number of Blocks to reserve for checkpointing. These Blocks
- are reserved per partition, so if you have very small partitions the
- default (10) may be a mess for you.
- You can set this value to 0, but that does not mean checkpointing is
- disabled at all. There only won't be any specially reserved blocks for
- checkpointing, so if there is enough free space on the filesystem,
- it will be used for checkpointing.
-
- If unsure, leave at default (10), but don't wonder if there are always
- 2MB used on your large page device partition (10 x 2k pagesize). When
- using small partitions or when being very small on space, you probably
- want to set this to zero.
config YAFFS_DISABLE_WIDE_TNODES
bool "Turn off wide tnodes"
depends on YAFFS_FS
default n
help
- Wide tnodes are only used for large NAND arrays (>=32MB for
- 512-byte page devices and >=128MB for 2k page devices). They use
- slightly more RAM but are faster since they eliminate chunk group
+ Wide tnodes are only used for NAND arrays >=32MB for 512-byte
+ page devices and >=128MB for 2k page devices. They use slightly
+ more RAM but are faster since they eliminate chunk group
searching.
- Setting this to 'y' will force tnode width to 16 bits and make
- large arrays slower.
+ Setting this to 'y' will force tnode width to 16 bits and save
+ memory but make large arrays slower.
If unsure, say N.
default n
help
Normally YAFFS only checks chunks before writing until an erased
- chunk is found. This helps to detect any partially written chunks
- that might have happened due to power loss.
+ chunk is found. This helps to detect any partially written
+ chunks that might have happened due to power loss.
Enabling this forces on the test that chunks are erased in flash
- before writing to them. This takes more time but is potentially a
- bit more secure.
-
- Suggest setting Y during development and ironing out driver issues
- etc. Suggest setting to N if you want faster writing.
+ before writing to them. This takes more time but is potentially
+ a bit more secure.
+
+ Suggest setting Y during development and ironing out driver
+ issues etc. Suggest setting to N if you want faster writing.
If unsure, say Y.
projects / yaffs2.git / blobdiff