target/linux/ipq806x/base-files/lib/upgrade/buffalo.sh

   1 #!/bin/sh
   2 # Copyright (C) 2018 OpenWrt.org
   3 #
   4
   5 . /lib/functions.sh
   6
   7 # The mtd partition 'ubi' and 'rootfs_1' on NAND flash are os-image
   8 # partitions. These partitions are called as "Bank1/Bank2" in U-Boot
   9 # on WXR-2533DHP, and they are checked conditions when booting.
  10 # Then, U-Boot checks kernel and rootfs volumes in ubi, but U-Boot
  11 # needs "ubi_rootfs" as rootfs volume name. And, U-Boot checks the
  12 # checksum at the end of rootfs (ubi_rootfs).
  13 # When U-Boot writes os-image into the Bank, only kernel, rootfs
  14 # (ubi_rootfs) and rootfs_data (ubi_rootfs_data) volumes are wrote
  15 # into the Bank. (not full ubi image)
  16 #
  17 # == U-Boot Behaviors ==
  18 # - Bank1/Bank2 images are good, images are different
  19 #   -> writes os-image to Bank1 from Bank2
  20 #      (this behavior is used to firmware upgrade in stock firmware)
  21 # - Bank1 image is broken (or checksum error)
  22 #   -> writes os-image to Bank1 from Bank2
  23 # - Bank2 image is broken (or checksum error)
  24 #   -> writes os-image to Bank2 from Bank1
  25 # - Bank1/Bank2 images are broken (or checksum error)
  26 #   -> start tftp
  27
  28 buffalo_upgrade_prepare_ubi() {
  29         local ubidev="$( nand_find_ubi ubi )"
  30         local mtdnum2="$( find_mtd_index rootfs_1 )"
  31
  32         if [ ! "$mtdnum2" ]; then
  33                 echo "cannot find second ubi mtd partition rootfs_1"
  34                 return 1
  35         fi
  36
  37         local ubidev2="$( nand_find_ubi rootfs_1 )"
  38         if [ ! "$ubidev2" ] && [ -n "$mtdnum2" ]; then
  39                 ubiattach -m "$mtdnum2"
  40                 ubidev2="$( nand_find_ubi rootfs_1 )"
  41         fi
  42
  43         ubirmvol /dev/$ubidev -N ubi_rootfs_data &> /dev/null || true
  44         ubirmvol /dev/$ubidev2 -N kernel &> /dev/null || true
  45 }