before writing the received buffer to nand, erase the nand
sectors. If not doing this, nand write fails. See for
more info here:

http://lists.denx.de/pipermail/u-boot/2013-June/156361.html

Signed-off-by: Heiko Schocher <h...@denx.de>
Cc: Scott Wood <scottw...@freescale.com>
Cc: Pantelis Antoniou <pa...@antoniou-consulting.com>
Cc: Lukasz Majewski <l.majew...@samsung.com>
Cc: Kyungmin Park <kyungmin.p...@samsung.com>
Cc: Marek Vasut <ma...@denx.de>
Cc: Tom Rini <tr...@ti.com>

---
- changes for v2:
  - use opts.spread as Scott Wood suggested

 drivers/dfu/dfu_nand.c | 17 +++++++++++++++--
 1 Datei geändert, 15 Zeilen hinzugefügt(+), 2 Zeilen entfernt(-)

diff --git a/drivers/dfu/dfu_nand.c b/drivers/dfu/dfu_nand.c
index 7dc89b2..93db9bd 100644
--- a/drivers/dfu/dfu_nand.c
+++ b/drivers/dfu/dfu_nand.c
@@ -63,12 +63,25 @@ static int nand_block_op(enum dfu_nand_op op, struct 
dfu_entity *dfu,
 
        nand = &nand_info[nand_curr_device];
 
-       if (op == DFU_OP_READ)
+       if (op == DFU_OP_READ) {
                ret = nand_read_skip_bad(nand, start, &count, &actual,
                                lim, buf);
-       else
+       } else {
+               nand_erase_options_t opts;
+
+               memset(&opts, 0, sizeof(opts));
+               opts.offset = start;
+               opts.length = count;
+               opts.spread = 1;
+               opts.quiet = 1;
+               /* first erase */
+               ret = nand_erase_opts(nand, &opts);
+               if (ret)
+                       return ret;
+               /* then write */
                ret = nand_write_skip_bad(nand, start, &count, &actual,
                                lim, buf, 0);
+       }
 
        if (ret != 0) {
                printf("%s: nand_%s_skip_bad call failed at %llx!\n",
-- 
1.7.11.7

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