boot.scr.txt

boot_scr_filesize=${filesize}

# constant values
setenv mender_boot_part_A 3
setenv mender_boot_part_hex_A 3
setenv mender_boot_part_B 4
setenv mender_boot_part_hex_B 4
setenv bootlimit 1

# initialize and store variables on first boot
if test "${edi_first_boot_done}" != "true"
then
    echo "Going to write environment on first boot!"
    setenv bootcount 0
    setenv upgrade_available 0
    setenv mender_boot_part ${mender_boot_part_A}
    setenv mender_boot_part_hex ${mender_boot_part_hex_A}
    setenv edi_first_boot_done true
    saveenv
fi

if test ${upgrade_available} = 1
then
    # mender will reset bootcount within EnableUpdatedPartition
    setexpr bootcount ${bootcount} + 1
    saveenv
else
    setenv bootcount 0
fi

if test ${bootcount} -gt ${bootlimit}
then
    echo "Switching back to previous setup due to hitting bootlimit!"
    if test ${mender_boot_part} = ${mender_boot_part_A}
    then
        setenv mender_boot_part ${mender_boot_part_B}
        setenv mender_boot_part_hex ${mender_boot_part_hex_B}
    else
        setenv mender_boot_part ${mender_boot_part_A}
        setenv mender_boot_part_hex ${mender_boot_part_hex_A}
    fi
    setenv upgrade_available 0
    saveenv
fi

setexpr secondary_scriptaddr ${loadaddr}

setenv edi_mmc_device ${dev}:${mender_boot_part_hex}

if test "${iface}" = "usb"
then
    setenv edi_boot_device /dev/sda1
    setenv edi_data_device /dev/sda2
    setenv edi_root_device /dev/sda${mender_boot_part}
else
    setenv edi_boot_device /dev/mmcblk2p1
    setenv edi_data_device /dev/mmcblk2p2
    setenv edi_root_device /dev/mmcblk2p${mender_boot_part}
fi

if ext4load ${iface} ${edi_mmc_device} ${secondary_scriptaddr} /boot/boot.scr
then
    echo "Successfully loaded secondary boot script."
else
    echo "Trying to reset an environment setup that does not match the current installation!"
    setenv edi_first_boot_done false
    saveenv
    # avoid busy reboot loop
    sleep 60
    reset
fi

source ${secondary_scriptaddr}

if test ${upgrade_available} = 1
then
    reset
fi