writting to ubi nand partitions need after write ends an erase
of the remaining sectors. This fail, if dfu write size was not
a multiple of erasesize, example log:

Failure erase: -1

Fix this error.

Signed-off-by: Heiko Schocher <h...@denx.de>
---

 drivers/dfu/dfu_nand.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/dfu/dfu_nand.c b/drivers/dfu/dfu_nand.c
index da2278e..f60d032 100644
--- a/drivers/dfu/dfu_nand.c
+++ b/drivers/dfu/dfu_nand.c
@@ -143,6 +143,7 @@ static int dfu_read_medium_nand(struct dfu_entity *dfu, u64 
offset, void *buf,
 static int dfu_flush_medium_nand(struct dfu_entity *dfu)
 {
        int ret = 0;
+       u64 off;
 
        /* in case of ubi partition, erase rest of the partition */
        if (dfu->data.nand.ubi) {
@@ -159,7 +160,16 @@ static int dfu_flush_medium_nand(struct dfu_entity *dfu)
                nand = &nand_info[nand_curr_device];
 
                memset(&opts, 0, sizeof(opts));
-               opts.offset = dfu->data.nand.start + dfu->offset +
+               off = dfu->offset;
+               if ((off & (nand->erasesize - 1)) != 0) {
+                       /*
+                        * last write ended with unaligned length
+                        * sector is erased, jump to next
+                        */
+                       off = off & ~((nand->erasesize - 1));
+                       off += nand->erasesize;
+               }
+               opts.offset = dfu->data.nand.start + off +
                                dfu->bad_skip;
                opts.length = dfu->data.nand.start +
                                dfu->data.nand.size - opts.offset;
-- 
2.5.5

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