[U-Boot] [PATCH] mtd: nand: am335x: Fix 'bit-flip' errors in SPL

[Rostislav Lisovy]

OMAP GPMC driver used with some NAND Flash devices
(e.g. Spansion S34ML08G1) causes that U-boot shows
hundreds of 'nand: bit-flip corrected' error messages.
Possible cause was discussed in the mailinglist thread:
http://lists.denx.de/pipermail/u-boot/2014-April/177508.html

The issue was partially fixed with the cc81a5291910d7a.git
however this has to be done to fix the SPL.

The original author of the code is Belisko Marek
<marek.belisko at gmail.com>

Signed-off-by: Rostislav Lisovy <lisovy at merica.cz>
---
 drivers/mtd/nand/am335x_spl_bch.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/am335x_spl_bch.c b/drivers/mtd/nand/am335x_spl_bch.c
index ce65d8e..bf8b2ee 100644
--- a/drivers/mtd/nand/am335x_spl_bch.c
+++ b/drivers/mtd/nand/am335x_spl_bch.c
@@ -64,14 +64,18 @@ static int nand_command(int block, int page, uint32_t offs,
 		       NAND_CTRL_ALE | NAND_CTRL_CHANGE); /* A[7:0] */
 	hwctrl(&nand_info[0], (offs >> 8) & 0xff, NAND_CTRL_ALE); /* A[11:9] */
 	/* Row address */
-	hwctrl(&nand_info[0], (page_addr & 0xff), NAND_CTRL_ALE); /* A[19:12] */
-	hwctrl(&nand_info[0], ((page_addr >> 8) & 0xff),
+	if (cmd != NAND_CMD_RNDOUT) {
+		hwctrl(&nand_info[0], (page_addr & 0xff),
+		       NAND_CTRL_ALE); /* A[19:12] */
+		hwctrl(&nand_info[0], ((page_addr >> 8) & 0xff),
 		       NAND_CTRL_ALE); /* A[27:20] */
 #ifdef CONFIG_SYS_NAND_5_ADDR_CYCLE
-	/* One more address cycle for devices > 128MiB */
-	hwctrl(&nand_info[0], (page_addr >> 16) & 0x0f,
+		/* One more address cycle for devices > 128MiB */
+		hwctrl(&nand_info[0], (page_addr >> 16) & 0x0f,
 		       NAND_CTRL_ALE); /* A[31:28] */
 #endif
+	}
+
 	hwctrl(&nand_info[0], NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
 
 	if (cmd == NAND_CMD_READ0) {
-- 
1.9.1