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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.
cfg_value_get()
{
local cfg=$1 cfg_opt
local section=$2 our_section=0
local param=$3 our_param=
for cfg_opt in $cfg; do
[ "$cfg_opt" = "[$section]" ] && our_section=1 && continue
[ "$our_section" = "1" ] || continue
our_param=${cfg_opt%%=*}
[ "$param" = "$our_param" ] && echo ${cfg_opt##*=} && break
done
}
platform_do_upgrade_openmesh()
{
local img_path="$1"
local restore_backup
local setenv_script="/tmp/fw_env_upgrade"
local inactive_mtd="$(find_mtd_index $PART_NAME)"
local inactive_offset="$(cat /sys/class/mtd/mtd${inactive_mtd}/offset)"
local total_size="$(cat /sys/class/mtd/mtd${inactive_mtd}/size)"
local total_kbs=$((total_size / 1024))
local flash_start_mem=0x9f000000
local data_offset=$((64 * 1024))
# detect to which flash region the new image is written to.
#
# 1. check what is the mtd index for the first flash region on this
# device
# 2. check if the target partition ("inactive") has the mtd index of
# the first flash region
#
# - when it is: the new bootseq will be 1,2 and the first region is
# modified
# - when it isn't: bootseq will be 2,1 and the second region is
# modified
#
# The detection has to be done via the hardcoded mtd partition because
# the current boot might be done with the fallback region. Let us
# assume that the current bootseq is 1,2. The bootloader detected that
# the image in flash region 1 is corrupt and thus switches to flash
# region 2. The bootseq in the u-boot-env is now still the same and
# the sysupgrade code can now only rely on the actual mtd indexes and
# not the bootseq variable to detect the currently booted flash
# region/image.
#
# In the above example, an implementation which uses bootseq ("1,2") to
# detect the currently booted image would assume that region 1 is booted
# and then overwrite the variables for the wrong flash region (aka the
# one which isn't modified). This could result in a device which doesn't
# boot anymore to Linux until it was reflashed with ap51-flash.
local next_boot_part="1"
local primary_kernel_mtd="3"
[ "$inactive_mtd" = "$primary_kernel_mtd" ] || next_boot_part="2"
local cfg_size=$(dd if="$img_path" bs=8 skip=70 count=1 iflag=skip_bytes 2>/dev/null)
local cfg_length=$((0x$cfg_size))
local cfg_content=$(dd if="$img_path" bs=$cfg_length skip=$data_offset count=1 iflag=skip_bytes 2>/dev/null)
local kernel_size=$(dd if="$img_path" bs=8 skip=142 count=1 iflag=skip_bytes 2>/dev/null)
local kernel_length=$((0x$kernel_size))
local kernel_kbs=$((kernel_length / 1024))
local kernel_md5=$(cfg_value_get "$cfg_content" "vmlinux" "md5sum")
local rootfs_size=$(dd if="$img_path" bs=8 skip=214 count=1 iflag=skip_bytes 2>/dev/null)
local rootfs_length=$((0x$rootfs_size))
local rootfs_md5=$(cfg_value_get "$cfg_content" "rootfs" "md5sum")
local rootfs_checksize=$(cfg_value_get "$cfg_content" "rootfs" "checksize")
# take care of restoring a saved config
[ -n "$UPGRADE_BACKUP" ] && restore_backup="${MTD_CONFIG_ARGS} -j ${UPGRADE_BACKUP}"
# write image parts
mtd -q erase inactive
dd if="$img_path" bs=1 skip=$((data_offset + cfg_length + kernel_length)) count=$rootfs_length 2>&- | \
mtd -n -p $kernel_length $restore_backup write - $PART_NAME
dd if="$img_path" bs=1024 skip=$((data_offset + cfg_length)) count=$kernel_kbs iflag=skip_bytes 2>&- | \
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 %i\n" $next_boot_part $kernel_kbs >> $setenv_script
printf "vmlinux_start_addr 0x%08x\n" $((flash_start_mem + inactive_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 %i\n" $next_boot_part $((total_kbs - kernel_kbs)) >> $setenv_script
printf "rootfs_start_addr 0x%08x\n" $((flash_start_mem+inactive_offset+kernel_length)) >> $setenv_script
printf "rootfs_size %s\n" $rootfs_checksize >> $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
}
}
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