target/linux/mvebu/patches-3.18/100-find_active_root.patch

   1 The WRT1900AC among other Linksys routers uses a dual-firmware layout.
   2 Dynamically rename the active partition to "ubi".
   3
   4 Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
   5
   6 --- a/drivers/mtd/ofpart.c
   7 +++ b/drivers/mtd/ofpart.c
   8 @@ -25,12 +25,15 @@ static bool node_has_compatible(struct d
   9         return of_get_property(pp, "compatible", NULL);
  10  }
  11
  12 +static int mangled_rootblock;
  13 +
  14  static int parse_ofpart_partitions(struct mtd_info *master,
  15                                    struct mtd_partition **pparts,
  16                                    struct mtd_part_parser_data *data)
  17  {
  18         struct device_node *node;
  19         const char *partname;
  20 +       const char *owrtpart = "ubi";
  21         struct device_node *pp;
  22         int nr_parts, i;
  23
  24 @@ -78,9 +81,15 @@ static int parse_ofpart_partitions(struc
  25                 (*pparts)[i].offset = of_read_number(reg, a_cells);
  26                 (*pparts)[i].size = of_read_number(reg + a_cells, s_cells);
  27
  28 -               partname = of_get_property(pp, "label", &len);
  29 -               if (!partname)
  30 -                       partname = of_get_property(pp, "name", &len);
  31 +               if (mangled_rootblock && (i == mangled_rootblock)) {
  32 +                               partname = owrtpart;
  33 +               } else {
  34 +                       partname = of_get_property(pp, "label", &len);
  35 +
  36 +                       if (!partname)
  37 +                               partname = of_get_property(pp, "name", &len);
  38 +               }
  39 +
  40                 (*pparts)[i].name = partname;
  41
  42                 if (of_get_property(pp, "read-only", &len))
  43 @@ -178,6 +187,18 @@ static int __init ofpart_parser_init(voi
  44         return 0;
  45  }
  46
  47 +static int __init active_root(char *str)
  48 +{
  49 +       get_option(&str, &mangled_rootblock);
  50 +
  51 +       if (!mangled_rootblock)
  52 +               return 1;
  53 +
  54 +       return 1;
  55 +}
  56 +
  57 +__setup("mangled_rootblock=", active_root);
  58 +
  59  static void __exit ofpart_parser_exit(void)
  60  {
  61         deregister_mtd_parser(&ofpart_parser);