[U-Boot] [PATCH 1/2] mtd/nand:Fix wrong address read in is_blank()

[Prabhakar Kushwaha]

IFC NAND Machine calculates ECC on 512byte sector. Same is taken care in 
fsl_ifc_run_command() while ECC status verification. Here buffer number is 
calculated assuming 512byte sector and same is passed to is_blank.
However in is_blank() buffer address is calculated using mdt->writesize which is
wrong. It should be calculated on basis of ecc sector size.

Also, in fsl_ifc_run_command() bufferpage is calculated on the basis of ecc sector 
size instead of hard coded value.

Signed-off-by: Poonam Aggrwal <poonam.aggrwal at freescale.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar at freescale.com>
---
 Based upon git://git.denx.de/u-boot.git (branch master)
 
 Top commit:
            commit bfcc40bb09b05c90cc3b1496abb270eb8aa72134
            Merge: cba9a89 1895420
            Author: Wolfgang Denk <wd at denx.de>
            Date:   Fri Dec 23 20:53:58 2011 +0100

                Merge branch 'next' of ../next
    
                * 'next' of ../next:
                mkenvimage: Add version info switch (-V)
                mkenvimage: Fix getopt() error handling
                mkenvimage: Fix some typos
                phy: add Micrel KS8721BL phy definition
                net: introduce per device index
                mvgbe: remove setting of ethaddr within the driver
                x86: Add support for specifying an initrd with the zboot command
                x86: Refactor the zboot innards so they can be reused with a vboot image
                x86: Add infrastructure to extract an e820 table from the coreboot tables
                x86: Add support for booting Linux using the 32 bit boot protocol
                x86: Clean up the x86 zimage code in preparation to extend it
                x86: Import code from coreboot's libpayload to parse the coreboot table
                x86: Initial commit for running as a coreboot payload
                CHECKPATCH: ./board/esd/hh405/logo_320_240_8bpp.c
                CHECKPATCH: ./board/esd/hh405/logo_1024_768_8bpp.c
                CHECKPATCH: ./board/esd/hh405/logo_320_240_4bpp.c
                CHECKPATCH: ./board/esd/hh405/logo_640_480_24bpp.c
                CHECKPATCH: ./board/esd/apc405/logo_640_480_24bpp.c
                CHECKPATCH: ./board/esd/voh405/logo_320_240_4bpp.c
                CHECKPATCH: ./board/esd/voh405/logo_640_480_24bpp.c
                CHECKPATCH: ./board/esd/hh405/fpgadata.c
                CHECKPATCH: ./board/esd/pci405/fpgadata.c
                CHECKPATCH: ./board/esd/tasreg/fpgadata.c

 drivers/mtd/nand/fsl_ifc_nand.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/fsl_ifc_nand.c b/drivers/mtd/nand/fsl_ifc_nand.c
index b3f3c3c..3a28ab8 100644
--- a/drivers/mtd/nand/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/fsl_ifc_nand.c
@@ -196,7 +196,9 @@ static int is_blank(struct mtd_info *mtd, struct fsl_ifc_ctrl *ctrl,
 {
 	struct nand_chip *chip = mtd->priv;
 	struct fsl_ifc_mtd *priv = chip->priv;
-	u8 __iomem *addr = priv->vbase + bufnum * (mtd->writesize * 2);
+	int bufperpage = mtd->writesize / chip->ecc.size;
+	u8 __iomem *addr = priv->vbase + bufnum / bufperpage
+					* (mtd->writesize * 2);
 	u32 __iomem *main = (u32 *)addr;
 	u8 __iomem *oob = addr + mtd->writesize;
 	int i;
@@ -279,7 +281,7 @@ static int fsl_ifc_run_command(struct mtd_info *mtd)
 		printf("%s: Write Protect Error\n", __func__);
 
 	if (ctrl->eccread) {
-		int bufperpage = mtd->writesize / 512;
+		int bufperpage = mtd->writesize / chip->ecc.size;
 		int bufnum = (ctrl->page & priv->bufnum_mask) * bufperpage;
 		int bufnum_end = bufnum + bufperpage - 1;
 
-- 
1.7.5.4