target/linux/ramips/base-files/lib/upgrade/ubnt.sh

   1 #
   2 # Copyright (C) 2015 OpenWrt.org
   3 #
   4
   5 . /lib/functions.sh
   6 #Note: this code also uses some functions from nand.sh, but it is expected to be run by nand.sh, so we are not
   7 #sourcing it explicitly here
   8
   9 UBNT_ERX_KERNEL_INDEX_OFFSET=160
  10
  11 ubnt_get_target_kernel() {
  12         local factory_mtd=$1
  13         local current_kernel_index=$(hexdump -s $UBNT_ERX_KERNEL_INDEX_OFFSET -n 1 -e '/1 "%X "' ${factory_mtd})
  14
  15         if [ $current_kernel_index == "0" ]; then
  16                 echo 'kernel2'
  17         elif [ $current_kernel_index == "1" ]; then
  18                 echo 'kernel1'
  19         fi
  20 }
  21
  22 ubnt_update_target_kernel() {
  23         local factory_mtd=$1
  24         local kernel_part=$2
  25
  26         local new_kernel_index
  27         if [ $kernel_part == "kernel1" ]; then
  28                 new_kernel_index="\x00"
  29         elif [ $kernel_part == "kernel2" ]; then
  30                 new_kernel_index="\x01"
  31         else
  32                 echo 'Unknown kernel image index' >&2
  33                 return 1
  34         fi
  35
  36         if ! (echo -e $new_kernel_index | dd of=${factory_mtd} bs=1 count=1 seek=$UBNT_ERX_KERNEL_INDEX_OFFSET); then
  37                 echo 'Failed to update kernel bootup index' >&2
  38                 return 1
  39         fi
  40 }
  41
  42 platform_upgrade_ubnt_erx() {
  43         local factory_mtd=$(find_mtd_part factory)
  44         if [ -z "$factory_mtd" ]; then
  45                 echo "cannot find factory partition" >&2
  46                 exit 1
  47         fi
  48
  49         local kernel_part="$(ubnt_get_target_kernel ${factory_mtd})"
  50         if [ -z "$kernel_part" ]; then
  51                 echo "cannot find factory partition" >&2
  52                 exit 1
  53         fi
  54
  55         # This is a global defined in nand.sh, sets partition kernel will be flashed into
  56         CI_KERNPART=${kernel_part}
  57
  58         #Remove volume possibly left over from stock firmware
  59         local ubidev="$( nand_find_ubi "$CI_UBIPART" )"
  60         if [ -z "$ubidev" ]; then
  61                 local mtdnum="$( find_mtd_index "$CI_UBIPART" )"
  62                 if [ -z "$mtdnum" ]; then
  63                         echo "cannot find ubi mtd partition $CI_UBIPART" >&2
  64                         exit 1
  65                 fi
  66                 ubiattach -m "$mtdnum"
  67                 sync
  68                 ubidev="$( nand_find_ubi "$CI_UBIPART" )"
  69         fi
  70         if [ -n "$ubidev" ]; then
  71                 local troot_ubivol="$( nand_find_volume $ubidev troot )"
  72                 [ -n "$troot_ubivol" ] && ubirmvol /dev/$ubidev -N troot || true
  73         fi
  74
  75         ubnt_update_target_kernel ${factory_mtd} ${kernel_part} || exit 1
  76 }