OpenWrt – Rev 1
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# The U-Boot loader of the OpenMesh devices requires image sizes and
# checksums to be provided in the U-Boot environment.
# The OpenMesh devices come with 2 main partitions - while one is active
# sysupgrade will flash the other. The boot order is changed to boot the
# newly flashed partition. If the new partition can't be booted due to
# upgrade failures the previously used partition is loaded.
platform_do_upgrade_openmesh() {
local tar_file="$1"
local restore_backup
local primary_kernel_mtd
local setenv_script="/tmp/fw_env_upgrade"
local kernel_mtd="$(find_mtd_index $PART_NAME)"
local kernel_offset="$(cat /sys/class/mtd/mtd${kernel_mtd}/offset)"
local total_size="$(cat /sys/class/mtd/mtd${kernel_mtd}/size)"
# detect to which flash region the new image is written to.
#
# 1. check what is the mtd index for the first flash region on this
# device
# 2. check if the target partition ("inactive") has the mtd index of
# the first flash region
#
# - when it is: the new bootseq will be 1,2 and the first region is
# modified
# - when it isnt: bootseq will be 2,1 and the second region is
# modified
#
# The detection has to be done via the hardcoded mtd partition because
# the current boot might be done with the fallback region. Let us
# assume that the current bootseq is 1,2. The bootloader detected that
# the image in flash region 1 is corrupt and thus switches to flash
# region 2. The bootseq in the u-boot-env is now still the same and
# the sysupgrade code can now only rely on the actual mtd indexes and
# not the bootseq variable to detect the currently booted flash
# region/image.
#
# In the above example, an implementation which uses bootseq ("1,2") to
# detect the currently booted image would assume that region 1 is booted
# and then overwrite the variables for the wrong flash region (aka the
# one which isn't modified). This could result in a device which doesn't
# boot anymore to Linux until it was reflashed with ap51-flash.
local next_boot_part="1"
case "$(board_name)" in
openmesh,a42)
primary_kernel_mtd=8
;;
openmesh,a62)
primary_kernel_mtd=10
;;
*)
echo "failed to detect primary kernel mtd partition for board"
return 1
;;
esac
[ "$kernel_mtd" = "$primary_kernel_mtd" ] || next_boot_part="2"
local board_dir=$(tar tf $tar_file | grep -m 1 '^sysupgrade-.*/$')
board_dir=${board_dir%/}
local kernel_length=$(tar xf $tar_file ${board_dir}/kernel -O | wc -c)
local rootfs_length=$(tar xf $tar_file ${board_dir}/root -O | wc -c)
# rootfs without EOF marker
rootfs_length=$((rootfs_length-4))
local kernel_md5=$(tar xf $tar_file ${board_dir}/kernel -O | md5sum); kernel_md5="${kernel_md5%% *}"
# md5 checksum of rootfs with EOF marker
local rootfs_md5=$(tar xf $tar_file ${board_dir}/root -O | dd bs=1 count=$rootfs_length | md5sum); rootfs_md5="${rootfs_md5%% *}"
#
# add tar support to get_image() to use default_do_upgrade() instead?
#
# take care of restoring a saved config
[ "$SAVE_CONFIG" -eq 1 ] && restore_backup="${MTD_CONFIG_ARGS} -j ${CONF_TAR}"
mtd -q erase inactive
tar xf $tar_file ${board_dir}/root -O | mtd -n -p $kernel_length $restore_backup write - $PART_NAME
tar xf $tar_file ${board_dir}/kernel -O | mtd -n write - $PART_NAME
# prepare new u-boot env
if [ "$next_boot_part" = "1" ]; then
echo "bootseq 1,2" > $setenv_script
else
echo "bootseq 2,1" > $setenv_script
fi
printf "kernel_size_%i 0x%08x\n" $next_boot_part $kernel_length >> $setenv_script
printf "vmlinux_start_addr 0x%08x\n" ${kernel_offset} >> $setenv_script
printf "vmlinux_size 0x%08x\n" ${kernel_length} >> $setenv_script
printf "vmlinux_checksum %s\n" ${kernel_md5} >> $setenv_script
printf "rootfs_size_%i 0x%08x\n" $next_boot_part $((total_size-kernel_length)) >> $setenv_script
printf "rootfs_start_addr 0x%08x\n" $((kernel_offset+kernel_length)) >> $setenv_script
printf "rootfs_size 0x%08x\n" ${rootfs_length} >> $setenv_script
printf "rootfs_checksum %s\n" ${rootfs_md5} >> $setenv_script
# store u-boot env changes
mkdir -p /var/lock
fw_setenv -s $setenv_script || {
echo "failed to update U-Boot environment"
return 1
}
}