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107 lines
4.1 KiB
Bash
107 lines
4.1 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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platform_do_upgrade_openmesh() {
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local tar_file="$1"
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local restore_backup
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local primary_kernel_mtd
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local setenv_script="/tmp/fw_env_upgrade"
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local kernel_mtd="$(find_mtd_index $PART_NAME)"
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local kernel_offset="$(cat /sys/class/mtd/mtd${kernel_mtd}/offset)"
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local total_size="$(cat /sys/class/mtd/mtd${kernel_mtd}/size)"
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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 isnt: 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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case "$(board_name)" in
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openmesh,a42)
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primary_kernel_mtd=8
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;;
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openmesh,a62)
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primary_kernel_mtd=10
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;;
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*)
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echo "failed to detect primary kernel mtd partition for board"
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return 1
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;;
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esac
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[ "$kernel_mtd" = "$primary_kernel_mtd" ] || next_boot_part="2"
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local board_dir=$(tar tf $tar_file | grep -m 1 '^sysupgrade-.*/$')
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board_dir=${board_dir%/}
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local kernel_length=$(tar xf $tar_file ${board_dir}/kernel -O | wc -c)
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local rootfs_length=$(tar xf $tar_file ${board_dir}/root -O | wc -c)
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# rootfs without EOF marker
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rootfs_length=$((rootfs_length-4))
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local kernel_md5=$(tar xf $tar_file ${board_dir}/kernel -O | md5sum); kernel_md5="${kernel_md5%% *}"
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# md5 checksum of rootfs with EOF marker
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local rootfs_md5=$(tar xf $tar_file ${board_dir}/root -O | dd bs=1 count=$rootfs_length | md5sum); rootfs_md5="${rootfs_md5%% *}"
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#
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# add tar support to get_image() to use default_do_upgrade() instead?
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#
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# take care of restoring a saved config
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[ "$UPGRADE_OPT_SAVE_CONFIG" -eq 1 ] && restore_backup="${MTD_CONFIG_ARGS} -j ${UPGRADE_BACKUP}"
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mtd -q erase inactive
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tar xf $tar_file ${board_dir}/root -O | mtd -n -p $kernel_length $restore_backup write - $PART_NAME
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tar xf $tar_file ${board_dir}/kernel -O | 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 0x%08x\n" $next_boot_part $kernel_length >> $setenv_script
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printf "vmlinux_start_addr 0x%08x\n" ${kernel_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 0x%08x\n" $next_boot_part $((total_size-kernel_length)) >> $setenv_script
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printf "rootfs_start_addr 0x%08x\n" $((kernel_offset+kernel_length)) >> $setenv_script
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printf "rootfs_size 0x%08x\n" ${rootfs_length} >> $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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