target/linux/brcm63xx/patches-3.3/012-mtd-bcm63xxpart-handle-Broadcom-partition-order.patch

   1 From a73c2d9dc7ea0d14fbf48db48e783d123162f5c3 Mon Sep 17 00:00:00 2001
   2 From: Jonas Gorski <jonas.gorski@gmail.com>
   3 Date: Thu, 19 Apr 2012 13:15:57 +0200
   4 Subject: [PATCH] mtd: bcm63xxpart: handle Broadcom partition order
   5
   6 The original Broadcom partition order has the root fs in front of the
   7 kernel, which resulted in miscalculated partition sizes.
   8 Detect when such an image is on the flash and also reorder the partitions
   9 accordingly.
  10
  11 Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
  12 Acked-by: Florian Fainelli <florian@openwrt.org>
  13 Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
  14 ---
  15  drivers/mtd/bcm63xxpart.c |   41 ++++++++++++++++++++++++++++++-----------
  16  1 file changed, 30 insertions(+), 11 deletions(-)
  17
  18 --- a/drivers/mtd/bcm63xxpart.c
  19 +++ b/drivers/mtd/bcm63xxpart.c
  20 @@ -4,7 +4,7 @@
  21   * Copyright © 2006-2008  Florian Fainelli <florian@openwrt.org>
  22   *                       Mike Albon <malbon@openwrt.org>
  23   * Copyright © 2009-2010  Daniel Dickinson <openwrt@cshore.neomailbox.net>
  24 - * Copyright © 2011 Jonas Gorski <jonas.gorski@gmail.com>
  25 + * Copyright © 2011-2012  Jonas Gorski <jonas.gorski@gmail.com>
  26   *
  27   * This program is free software; you can redistribute it and/or modify
  28   * it under the terms of the GNU General Public License as published by
  29 @@ -82,6 +82,7 @@ static int bcm63xx_parse_cfe_partitions(
  30         int namelen = 0;
  31         int i;
  32         u32 computed_crc;
  33 +       bool rootfs_first = false;
  34
  35         if (bcm63xx_detect_cfe(master))
  36                 return -EINVAL;
  37 @@ -109,6 +110,7 @@ static int bcm63xx_parse_cfe_partitions(
  38                 char *boardid = &(buf->board_id[0]);
  39                 char *tagversion = &(buf->tag_version[0]);
  40
  41 +               sscanf(buf->flash_image_start, "%u", &rootfsaddr);
  42                 sscanf(buf->kernel_address, "%u", &kerneladdr);
  43                 sscanf(buf->kernel_length, "%u", &kernellen);
  44                 sscanf(buf->total_length, "%u", &totallen);
  45 @@ -117,10 +119,19 @@ static int bcm63xx_parse_cfe_partitions(
  46                         tagversion, boardid);
  47
  48                 kerneladdr = kerneladdr - BCM63XX_EXTENDED_SIZE;
  49 -               rootfsaddr = kerneladdr + kernellen;
  50 +               rootfsaddr = rootfsaddr - BCM63XX_EXTENDED_SIZE;
  51                 spareaddr = roundup(totallen, master->erasesize) + cfelen;
  52                 sparelen = master->size - spareaddr - nvramlen;
  53 -               rootfslen = spareaddr - rootfsaddr;
  54 +
  55 +               if (rootfsaddr < kerneladdr) {
  56 +                       /* default Broadcom layout */
  57 +                       rootfslen = kerneladdr - rootfsaddr;
  58 +                       rootfs_first = true;
  59 +               } else {
  60 +                       /* OpenWrt layout */
  61 +                       rootfsaddr = kerneladdr + kernellen;
  62 +                       rootfslen = spareaddr - rootfsaddr;
  63 +               }
  64         } else {
  65                 pr_warn("CFE boot tag CRC invalid (expected %08x, actual %08x)\n",
  66                         buf->header_crc, computed_crc);
  67 @@ -156,18 +167,26 @@ static int bcm63xx_parse_cfe_partitions(
  68         curpart++;
  69
  70         if (kernellen > 0) {
  71 -               parts[curpart].name = "kernel";
  72 -               parts[curpart].offset = kerneladdr;
  73 -               parts[curpart].size = kernellen;
  74 +               int kernelpart = curpart;
  75 +
  76 +               if (rootfslen > 0 && rootfs_first)
  77 +                       kernelpart++;
  78 +               parts[kernelpart].name = "kernel";
  79 +               parts[kernelpart].offset = kerneladdr;
  80 +               parts[kernelpart].size = kernellen;
  81                 curpart++;
  82         }
  83
  84         if (rootfslen > 0) {
  85 -               parts[curpart].name = "rootfs";
  86 -               parts[curpart].offset = rootfsaddr;
  87 -               parts[curpart].size = rootfslen;
  88 -               if (sparelen > 0)
  89 -                       parts[curpart].size += sparelen;
  90 +               int rootfspart = curpart;
  91 +
  92 +               if (kernellen > 0 && rootfs_first)
  93 +                       rootfspart--;
  94 +               parts[rootfspart].name = "rootfs";
  95 +               parts[rootfspart].offset = rootfsaddr;
  96 +               parts[rootfspart].size = rootfslen;
  97 +               if (sparelen > 0  && !rootfs_first)
  98 +                       parts[rootfspart].size += sparelen;
  99                 curpart++;
 100         }
 101