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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-03-27 17:18:45 +0200
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-04-17 11:32:00 +0300
commit6e0c84e37e809e79313043385148020ceb760496 (patch)
tree50759478329fb8cd2083db986bc2b60395820024 /drivers/mtd
parentc4506092c1773211b71a75bd557c02b090c82b66 (diff)
UBI: improve Kconfig documentation
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/ubi/Kconfig9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/mtd/ubi/Kconfig b/drivers/mtd/ubi/Kconfig
index b9daf159a4a..3f063108e95 100644
--- a/drivers/mtd/ubi/Kconfig
+++ b/drivers/mtd/ubi/Kconfig
@@ -24,8 +24,13 @@ config MTD_UBI_WL_THRESHOLD
erase counter value and the lowest erase counter value of eraseblocks
of UBI devices. When this threshold is exceeded, UBI starts performing
wear leveling by means of moving data from eraseblock with low erase
- counter to eraseblocks with high erase counter. Leave the default
- value if unsure.
+ counter to eraseblocks with high erase counter.
+
+ The default value should be OK for SLC NAND flashes, NOR flashes and
+ other flashes which have eraseblock life-cycle 100000 or more.
+ However, in case of MLC NAND flashes which typically have eraseblock
+ life-cycle less then 10000, the threshold should be lessened (e.g.,
+ to 128 or 256, although it does not have to be power of 2).
config MTD_UBI_BEB_RESERVE
int "Percentage of reserved eraseblocks for bad eraseblocks handling"