Merge branch 'linux-next' of git://git.infradead.org/ubifs-2.6

[pandora-kernel.git] / lib / Kconfig

diff --git a/lib/Kconfig b/lib/Kconfig
index 23fa7a3..9c10e38 100644 (file)
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -157,6 +157,45 @@ config REED_SOLOMON_ENC16
 config REED_SOLOMON_DEC16
        boolean
 
+#
+# BCH support is selected if needed
+#
+config BCH
+       tristate
+
+config BCH_CONST_PARAMS
+       boolean
+       help
+         Drivers may select this option to force specific constant
+         values for parameters 'm' (Galois field order) and 't'
+         (error correction capability). Those specific values must
+         be set by declaring default values for symbols BCH_CONST_M
+         and BCH_CONST_T.
+         Doing so will enable extra compiler optimizations,
+         improving encoding and decoding performance up to 2x for
+         usual (m,t) values (typically such that m*t < 200).
+         When this option is selected, the BCH library supports
+         only a single (m,t) configuration. This is mainly useful
+         for NAND flash board drivers requiring known, fixed BCH
+         parameters.
+
+config BCH_CONST_M
+       int
+       range 5 15
+       help
+         Constant value for Galois field order 'm'. If 'k' is the
+         number of data bits to protect, 'm' should be chosen such
+         that (k + m*t) <= 2**m - 1.
+         Drivers should declare a default value for this symbol if
+         they select option BCH_CONST_PARAMS.
+
+config BCH_CONST_T
+       int
+       help
+         Constant value for error correction capability in bits 't'.
+         Drivers should declare a default value for this symbol if
+         they select option BCH_CONST_PARAMS.
+
 #
 # Textsearch support is select'ed if needed
 #