target/linux/ar71xx/base-files/lib/upgrade/allnet.sh

   1 # The U-Boot loader of the some Allnet devices requires image sizes and
   2 # checksums to be provided in the U-Boot environment.
   3 # In case the check fails during boot, a failsafe-system is started to provide
   4 # a minimal web-interface for flashing a new firmware.
   5
   6 # determine size of the main firmware partition
   7 platform_get_firmware_size() {
   8         local dev size erasesize name
   9         while read dev size erasesize name; do
  10                 name=${name#'"'}; name=${name%'"'}
  11                 case "$name" in
  12                         firmware)
  13                                 printf "%d" "0x$size"
  14                                 break
  15                         ;;
  16                 esac
  17         done < /proc/mtd
  18 }
  19
  20 # get the first 4 bytes (magic) of a given file starting at offset in hex format
  21 get_magic_long_at() {
  22         dd if="$1" skip=$(( $CI_BLKSZ / 4 * $2 )) bs=4 count=1 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"'
  23 }
  24
  25 get_filesize() {
  26         wc -c "$1" | while read image_size _n ; do echo $image_size ; break; done
  27 }
  28
  29 # scan through the update image pages until matching a magic
  30 platform_get_offset() {
  31         offsetcount=0
  32         magiclong="x"
  33         if [ -n "$3" ]; then
  34                 offsetcount=$3
  35         fi
  36         while magiclong=$( get_magic_long_at "$1" "$offsetcount" ) && [ -n "$magiclong" ]; do
  37                 case "$magiclong" in
  38                         "2705"*)
  39                                 # U-Boot image magic
  40                                 if [ "$2" = "uImage" ]; then
  41                                         echo $offsetcount
  42                                         return
  43                                 fi
  44                         ;;
  45                         "68737173"|"73717368")
  46                                 # SquashFS
  47                                 if [ "$2" = "rootfs" ]; then
  48                                         echo $offsetcount
  49                                         return
  50                                 fi
  51                         ;;
  52                         "deadc0de"|"19852003")
  53                                 # JFFS2 empty page
  54                                 if [ "$2" = "rootfs-data" ]; then
  55                                         echo $offsetcount
  56                                         return
  57                                 fi
  58                         ;;
  59                 esac
  60                 offsetcount=$(( $offsetcount + 1 ))
  61         done
  62 }
  63
  64 platform_check_image_allnet() {
  65         local fw_printenv=/usr/sbin/fw_printenv
  66         [ ! -n "$fw_printenv" -o ! -x "$fw_printenv" ] && {
  67                 echo "Please install uboot-envtools!"
  68                 return 1
  69         }
  70
  71         [ ! -r "/etc/fw_env.config" ] && {
  72                 echo "/etc/fw_env.config is missing"
  73                 return 1
  74         }
  75
  76         local image_size=$( get_filesize "$1" )
  77         local firmware_size=$( platform_get_firmware_size )
  78         [ $image_size -ge $firmware_size ] &&
  79         {
  80                 echo "upgrade image is too big (${image_size}b > ${firmware_size}b)"
  81         }
  82
  83         local vmlinux_blockoffset=$( platform_get_offset "$1" uImage )
  84         [ -z $vmlinux_blockoffset ] && {
  85                 echo "vmlinux-uImage not found"
  86                 return 1
  87         }
  88
  89         local rootfs_blockoffset=$( platform_get_offset "$1" rootfs "$vmlinux_blockoffset" )
  90         [ -z $rootfs_blockoffset ] && {
  91                 echo "missing rootfs"
  92                 return 1
  93         }
  94
  95         local data_blockoffset=$( platform_get_offset "$1" rootfs-data "$rootfs_blockoffset" )
  96         [ -z $data_blockoffset ] && {
  97                 echo "rootfs doesn't have JFFS2 end marker"
  98                 return 1
  99         }
 100
 101         return 0
 102 }
 103
 104 platform_do_upgrade_allnet() {
 105         local firmware_base_addr=$( printf "%d" "$1" )
 106         local vmlinux_blockoffset=$( platform_get_offset "$2" uImage )
 107         if [ ! -n "$vmlinux_blockoffset" ]; then
 108                 echo "can't determine uImage offset"
 109                 return 1
 110         fi
 111         local rootfs_blockoffset=$( platform_get_offset "$2" rootfs $(( $vmlinux_blockoffset + 1 )) )
 112         local vmlinux_offset=$(( $vmlinux_blockoffset * $CI_BLKSZ ))
 113         local vmlinux_addr=$(( $firmware_base_addr + $vmlinux_offset ))
 114         local vmlinux_hexaddr=0x$( printf "%08x" "$vmlinux_addr" )
 115         if [ ! -n "$rootfs_blockoffset" ]; then
 116                 echo "can't determine rootfs offset"
 117                 return 1
 118         fi
 119         local rootfs_offset=$(( $rootfs_blockoffset * $CI_BLKSZ ))
 120         local rootfs_addr=$(( $firmware_base_addr + $rootfs_offset ))
 121         local rootfs_hexaddr=0x$( printf "%08x" "$rootfs_addr" )
 122         local vmlinux_blockcount=$(( $rootfs_blockoffset - $vmlinux_blockoffset ))
 123         local vmlinux_size=$(( $rootfs_offset - $vmlinux_offset ))
 124         local vmlinux_hexsize=0x$( printf "%08x" "$vmlinux_size" )
 125         local data_blockoffset=$( platform_get_offset "$2" rootfs-data $(( $rootfs_blockoffset + 1 )) )
 126         if [ ! -n "$data_blockoffset" ]; then
 127                 echo "can't determine rootfs size"
 128                 return 1
 129         fi
 130         local data_offset=$(( $data_blockoffset * $CI_BLKSZ ))
 131         local rootfs_blockcount=$(( $data_blockoffset - $rootfs_blockoffset ))
 132         local rootfs_size=$(( $data_offset - $rootfs_offset ))
 133         local rootfs_hexsize=0x$( printf "%08x" "$rootfs_size" )
 134
 135         local rootfs_md5=$( dd if="$2" bs=$CI_BLKSZ skip=$rootfs_blockoffset count=$rootfs_blockcount 2>/dev/null | md5sum -); rootfs_md5="${rootfs_md5%% *}"
 136         local vmlinux_md5=$( dd if="$2" bs=$CI_BLKSZ skip=$vmlinux_blockoffset count=$vmlinux_blockcount 2>/dev/null | md5sum -); vmlinux_md5="${vmlinux_md5%% *}"
 137         # this needs a recent version of uboot-envtools!
 138         cat >/tmp/fw_env_upgrade <<EOF
 139 vmlinux_start_addr $vmlinux_hexaddr
 140 vmlinux_size $vmlinux_hexsize
 141 vmlinux_checksum $vmlinux_md5
 142 rootfs_start_addr $rootfs_hexaddr
 143 rootfs_size $rootfs_hexsize
 144 rootfs_checksum $rootfs_md5
 145 bootcmd bootm $vmlinux_hexaddr
 146 EOF
 147
 148         mkdir -p /var/lock
 149         fw_setenv -s /tmp/fw_env_upgrade || {
 150                 echo "failed to update U-Boot environment"
 151                 return 1
 152         }
 153         shift
 154         default_do_upgrade "$@"
 155 }