imx: nand: Support flash based BBT

Signed-off-by: Timo Ketola <timo@exertus.fi>
Acked-by: Scott Wood <scottwood@freescale.com>

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index 35e89a0..936186f 100644 (file)
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -1302,12 +1302,45 @@ static void mxc_setup_config1(void)
 #define mxc_setup_config1()
 #endif
 
+#ifdef CONFIG_SYS_NAND_USE_FLASH_BBT
+
+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 | NAND_BBT_PERCHIP,
+       .offs = 0,
+       .len = 4,
+       .veroffs = 4,
+       .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 | NAND_BBT_PERCHIP,
+       .offs = 0,
+       .len = 4,
+       .veroffs = 4,
+       .maxblocks = 4,
+       .pattern = mirror_pattern,
+};
+
+#endif
+
 int board_nand_init(struct nand_chip *this)
 {
        struct mtd_info *mtd;
        uint16_t tmp;
        int err = 0;
 
+#ifdef CONFIG_SYS_NAND_USE_FLASH_BBT
+       this->options |= NAND_USE_FLASH_BBT;
+       this->bbt_td = &bbt_main_descr;
+       this->bbt_md = &bbt_mirror_descr;
+#endif
+
        /* structures must be linked */
        mtd = &host->mtd;
        mtd->priv = this;