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