We had a problem where NAND device ID would be corrupted after a
power-cycle. According to the Micron datasheet it requires a RESET
after power-up before any commands may be issued. Without this patch
the manufacturer ID would be correct, but the device ID, cellinfo and
extra ID would be incorrect.
Signed-off-by: David George <david at harktech.com>
---
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 0913bb8..3b9552d 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2360,6 +2360,12 @@ static struct nand_flash_dev
*nand_get_flash_type(struct mtd_info *mtd,
/* Select the device */
chip->select_chip(mtd, 0);
+ /*
+ * Micron needs a RESET after power up before issuing
+ * any other commands
+ */
+ chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
+
/* Send the command for reading device ID */
chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
--
David George
Hark Technologies
http://harktech.com
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