target/linux/ramips/patches-3.8/0208-owrt-mtd-split.patch

   1 From 2a295753a10823a47542c779a25bbb1f52c71281 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Fri, 3 Aug 2012 10:27:13 +0200
   4 Subject: [PATCH 19/25] owrt mtd split
   5
   6 ---
   7  .../mips/include/asm/mach-lantiq/xway/lantiq_soc.h |    1 +
   8  arch/mips/lantiq/setup.c                           |    7 +
   9  drivers/mtd/Kconfig                                |    4 +
  10  drivers/mtd/mtdpart.c                              |  173 +++++++++++++++++++-
  11  4 files changed, 184 insertions(+), 1 deletions(-)
  12
  13 Index: linux-3.9-rc4/drivers/mtd/Kconfig
  14 ===================================================================
  15 --- linux-3.9-rc4.orig/drivers/mtd/Kconfig      2013-03-27 09:26:32.005789709 +0100
  16 +++ linux-3.9-rc4/drivers/mtd/Kconfig   2013-03-27 09:26:35.669789796 +0100
  17 @@ -31,6 +31,10 @@
  18         bool "Automatically split 'rootfs' partition for squashfs"
  19         default y
  20
  21 +config MTD_UIMAGE_SPLIT
  22 +       bool "Automatically split 'linux' partition into 'kernel' and 'rootfs'"
  23 +       default y
  24 +
  25  config MTD_REDBOOT_PARTS
  26         tristate "RedBoot partition table parsing"
  27         ---help---
  28 Index: linux-3.9-rc4/drivers/mtd/mtdpart.c
  29 ===================================================================
  30 --- linux-3.9-rc4.orig/drivers/mtd/mtdpart.c    2013-03-27 09:26:32.281789715 +0100
  31 +++ linux-3.9-rc4/drivers/mtd/mtdpart.c 2013-03-27 17:20:12.874466937 +0100
  32 @@ -844,6 +844,99 @@
  33  }
  34  #endif /* CONFIG_MTD_ROOTFS_SPLIT */
  35
  36 +#ifdef CONFIG_MTD_UIMAGE_SPLIT
  37 +static unsigned long find_uimage_size(struct mtd_info *mtd,
  38 +                                     unsigned long offset)
  39 +{
  40 +#define UBOOT_MAGIC    0x56190527
  41 +       unsigned long magic = 0;
  42 +       unsigned long temp;
  43 +       size_t len;
  44 +       int ret;
  45 +
  46 +       ret = mtd_read(mtd, offset, 4, &len, (void *)&magic);
  47 +       if (ret || len != sizeof(magic))
  48 +               return 0;
  49 +
  50 +       if (le32_to_cpu(magic) != UBOOT_MAGIC)
  51 +               return 0;
  52 +
  53 +       ret = mtd_read(mtd, offset + 12, 4, &len, (void *)&temp);
  54 +       if (ret || len != sizeof(temp))
  55 +               return 0;
  56 +
  57 +       return be32_to_cpu(temp) + 0x40;
  58 +}
  59 +
  60 +static int detect_squashfs_partition(struct mtd_info *mtd, unsigned long offset)
  61 +{
  62 +       unsigned long temp;
  63 +       size_t len;
  64 +       int ret;
  65 +
  66 +       ret = mtd_read(mtd, offset, 4, &len, (void *)&temp);
  67 +       if (ret || len != sizeof(temp))
  68 +               return 0;
  69 +
  70 +       return le32_to_cpu(temp) == SQUASHFS_MAGIC;
  71 +}
  72 +
  73 +static unsigned long find_squashfs_offset(struct mtd_info *mtd, unsigned long _offset)
  74 +{
  75 +       /* scan the first 2MB at 64K offsets */
  76 +       int i;
  77 +
  78 +       for (i = 0; i < 32; i++) {
  79 +               unsigned long offset = i * 64 * 1024;
  80 +               if (detect_squashfs_partition(mtd, _offset + offset))
  81 +                       return offset;
  82 +       }
  83 +       return 0;
  84 +}
  85 +
  86 +static int split_uimage(struct mtd_info *mtd,
  87 +                       const struct mtd_partition *part)
  88 +{
  89 +       static struct mtd_partition split_partitions[] = {
  90 +               {
  91 +                       .name = "kernel",
  92 +                       .offset = 0x0,
  93 +                       .size = 0x0,
  94 +               }, {
  95 +                       .name = "rootfs",
  96 +                       .offset = 0x0,
  97 +                       .size = 0x0,
  98 +               },
  99 +       };
 100 +
 101 +       split_partitions[0].size = find_uimage_size(mtd, part->offset);
 102 +       if (!split_partitions[0].size) {
 103 +               split_partitions[0].size = find_squashfs_offset(mtd, part->offset);
 104 +               if (!split_partitions[0].size) {
 105 +                       pr_err("failed to split firmware partition\n");
 106 +                       return -1;
 107 +               }
 108 +       }
 109 +
 110 +       if (!detect_squashfs_partition(mtd,
 111 +                                      part->offset
 112 +                                      + split_partitions[0].size)) {
 113 +               split_partitions[0].size &= ~(mtd->erasesize - 1);
 114 +               split_partitions[0].size += mtd->erasesize;
 115 +       } else {
 116 +               pr_info("found squashfs behind kernel\n");
 117 +       }
 118 +
 119 +       split_partitions[0].offset = part->offset;
 120 +       split_partitions[1].offset = part->offset + split_partitions[0].size;
 121 +       split_partitions[1].size = part->size - split_partitions[0].size;
 122 +
 123 +       add_mtd_partitions(mtd, split_partitions, 2);
 124 +
 125 +       return 0;
 126 +}
 127 +#endif
 128 +
 129  /*
 130   * This function, given a master MTD object and a partition table, creates
 131   * and registers slave MTD objects which are bound to the master according to
 132 @@ -860,7 +953,7 @@
 133         struct mtd_part *slave;
 134         uint64_t cur_offset = 0;
 135         int i;
 136 -#ifdef CONFIG_MTD_ROOTFS_SPLIT
 137 +#if defined(CONFIG_MTD_ROOTFS_SPLIT) || defined(CONFIG_MTD_UIMAGE_SPLIT)
 138         int ret;
 139  #endif
 140
 141 @@ -877,6 +970,14 @@
 142
 143                 add_mtd_device(&slave->mtd);
 144
 145 +#ifdef CONFIG_MTD_UIMAGE_SPLIT
 146 +               if (!strcmp(parts[i].name, "firmware")) {
 147 +                       ret = split_uimage(master, &parts[i]);
 148 +                       if (ret)
 149 +                               printk(KERN_WARNING "Can't split firmware partition\n");
 150 +               }
 151 +#endif
 152 +
 153                 if (!strcmp(parts[i].name, "rootfs")) {
 154  #ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
 155                         if (ROOT_DEV == 0) {