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-rw-r--r--drivers/mtd/nand/fsl_elbc_nand.c35
1 files changed, 34 insertions, 1 deletions
diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c
index b8bc143..e4e4de0 100644
--- a/drivers/mtd/nand/fsl_elbc_nand.c
+++ b/drivers/mtd/nand/fsl_elbc_nand.c
@@ -136,6 +136,34 @@ static struct nand_bbt_descr largepage_memorybased = {
.pattern = scan_ff_pattern,
};
+/*
+ * ELBC may use HW ECC, so that OOB offsets, that NAND core uses for bbt,
+ * interfere with ECC positions, that's why we implement our own descriptors.
+ * OOB {11, 5}, works for both SP and LP chips, with ECCM = 1 and ECCM = 0.
+ */
+static u8 bbt_pattern[] = {'B', 'b', 't', '0' };
+static u8 mirror_pattern[] = {'1', 't', 'b', 'B' };
+
+static struct nand_bbt_descr bbt_main_descr = {
+ .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
+ NAND_BBT_2BIT | NAND_BBT_VERSION,
+ .offs = 11,
+ .len = 4,
+ .veroffs = 15,
+ .maxblocks = 4,
+ .pattern = bbt_pattern,
+};
+
+static struct nand_bbt_descr bbt_mirror_descr = {
+ .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
+ NAND_BBT_2BIT | NAND_BBT_VERSION,
+ .offs = 11,
+ .len = 4,
+ .veroffs = 15,
+ .maxblocks = 4,
+ .pattern = mirror_pattern,
+};
+
/*=================================*/
/*
@@ -738,7 +766,12 @@ int board_nand_init(struct nand_chip *nand)
nand->waitfunc = fsl_elbc_wait;
/* set up nand options */
- nand->options = NAND_NO_READRDY | NAND_NO_AUTOINCR;
+ nand->bbt_td = &bbt_main_descr;
+ nand->bbt_md = &bbt_mirror_descr;
+
+ /* set up nand options */
+ nand->options = NAND_NO_READRDY | NAND_NO_AUTOINCR |
+ NAND_USE_FLASH_BBT;
nand->controller = &elbc_ctrl->controller;
nand->priv = priv;