target/linux/sunxi/patches-4.1/125-mtd-nand-sunxi-extend-bbt_options.patch

   1 From a5ba30016f4a29f5875112169a92a28a9ba7f5c9 Mon Sep 17 00:00:00 2001
   2 From: Hans de Goede <hdegoede@redhat.com>
   3 Date: Mon, 25 May 2015 11:59:03 +0200
   4 Subject: [PATCH] mtd: nand: sunxi: Add NAND_BBT_CREATE_EMPTY to bbt_options
   5
   6 The ftl format used by the Allwinner Android kernels, with which most
   7 Allwinnner devices ship, overrides the factory bad block markers, and
   8 fills the oob data with a pattern which causes a lot of false bad block
   9 positives, so when we first create a bbt table, start with an empty one
  10 to avoid marking a ton of blocks as bad from the start.
  11
  12 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
  13 ---
  14  drivers/mtd/nand/sunxi_nand.c | 9 +++++++++
  15  1 file changed, 9 insertions(+)
  16
  17 --- a/drivers/mtd/nand/sunxi_nand.c
  18 +++ b/drivers/mtd/nand/sunxi_nand.c
  19 @@ -1851,6 +1851,15 @@ static int sunxi_nand_chip_init(struct d
  20         if (of_get_nand_on_flash_bbt(np))
  21                 nand->bbt_options |= NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
  22
  23 +       /*
  24 +        * The ftl format used by the Allwinner Android kernels overrides
  25 +        * the factory bad block markers, and fills the oob data with a
  26 +        * pattern which causes a lot of false bad block positives, so
  27 +        * when we first create a bbt table, start with an empty one
  28 +        * to avoid marking a ton of blocks as bad from the start.
  29 +        */
  30 +       nand->bbt_options |= NAND_BBT_CREATE_EMPTY;
  31 +
  32         mtd = &chip->mtd;
  33         mtd->dev.parent = dev;
  34         mtd->priv = nand;