target/linux/brcm47xx/patches-3.8/023-mtd-bcm47xxpart-improve-probing-of-nvram-partition.patch

   1 --- a/drivers/mtd/bcm47xxpart.c
   2 +++ b/drivers/mtd/bcm47xxpart.c
   3 @@ -19,12 +19,6 @@
   4  /* 10 parts were found on sflash on Netgear WNDR4500 */
   5  #define BCM47XXPART_MAX_PARTS          12
   6
   7 -/*
   8 - * Amount of bytes we read when analyzing each block of flash memory.
   9 - * Set it big enough to allow detecting partition and reading important data.
  10 - */
  11 -#define BCM47XXPART_BYTES_TO_READ      0x404
  12 -
  13  /* Magics */
  14  #define BOARD_DATA_MAGIC               0x5246504D      /* MPFR */
  15  #define POT_MAGIC1                     0x54544f50      /* POTT */
  16 @@ -63,14 +57,17 @@ static int bcm47xxpart_parse(struct mtd_
  17         struct trx_header *trx;
  18         int trx_part = -1;
  19         int last_trx_part = -1;
  20 +       int max_bytes_to_read = 0x8004;
  21
  22         if (blocksize <= 0x10000)
  23                 blocksize = 0x10000;
  24 +       if (blocksize == 0x20000)
  25 +               max_bytes_to_read = 0x18004;
  26
  27         /* Alloc */
  28         parts = kzalloc(sizeof(struct mtd_partition) * BCM47XXPART_MAX_PARTS,
  29                         GFP_KERNEL);
  30 -       buf = kzalloc(BCM47XXPART_BYTES_TO_READ, GFP_KERNEL);
  31 +       buf = kzalloc(max_bytes_to_read, GFP_KERNEL);
  32
  33         /* Parse block by block looking for magics */
  34         for (offset = 0; offset <= master->size - blocksize;
  35 @@ -85,7 +82,7 @@ static int bcm47xxpart_parse(struct mtd_
  36                 }
  37
  38                 /* Read beginning of the block */
  39 -               if (mtd_read(master, offset, BCM47XXPART_BYTES_TO_READ,
  40 +               if (mtd_read(master, offset, max_bytes_to_read,
  41                              &bytes_read, (uint8_t *)buf) < 0) {
  42                         pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
  43                                offset);
  44 @@ -100,9 +97,16 @@ static int bcm47xxpart_parse(struct mtd_
  45                 }
  46
  47                 /* Standard NVRAM */
  48 -               if (buf[0x000 / 4] == NVRAM_HEADER) {
  49 +               if (buf[0x000 / 4] == NVRAM_HEADER ||
  50 +                   buf[0x1000 / 4] == NVRAM_HEADER ||
  51 +                   buf[0x8000 / 4] == NVRAM_HEADER ||
  52 +                   (blocksize == 0x20000 && (
  53 +                     buf[0x10000 / 4] == NVRAM_HEADER ||
  54 +                     buf[0x11000 / 4] == NVRAM_HEADER ||
  55 +                     buf[0x18000 / 4] == NVRAM_HEADER))) {
  56                         bcm47xxpart_add_part(&parts[curr_part++], "nvram",
  57                                              offset, 0);
  58 +                       offset = rounddown(offset, blocksize);
  59                         continue;
  60                 }
  61