kirkwood_nand: allow usage of NAND_ECC_SOFT_BCH

If CONFIG_NAND_ECC_BCH is set use 4-bit error correction code instead of
the 1-bit error correction code on the NAND device.
Signed-off-by: NGerlando Falauto <gerlando.falauto@keymile.com>
Signed-off-by: NHolger Brunck <holger.brunck@keymile.com>
cc: Valentin Longchamp <valentin.longchamp@keymile.com>
cc: Prafulla Wadaskar <prafulla@marvell.com>
Acked-by: NPrafulla Wadaskar <prafulla@marvell.com>
Acked-by: NScott Wood <scottwood@freescale.com>

drivers/mtd/nand/kirkwood_nand.c

@@ -74,7 +74,11 @@ void kw_nand_select_chip(struct mtd_info *mtd, int chip)
 int board_nand_init(struct nand_chip *nand)
 {
 	nand->options = NAND_COPYBACK | NAND_CACHEPRG | NAND_NO_PADDING;
+#if defined(CONFIG_NAND_ECC_BCH)
+	nand->ecc.mode = NAND_ECC_SOFT_BCH;
+#else
 	nand->ecc.mode = NAND_ECC_SOFT;
+#endif
 	nand->cmd_ctrl = kw_nand_hwcontrol;
 	nand->chip_delay = 40;
 	nand->select_chip = kw_nand_select_chip;