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    'image' =>
    {
        'linux_axp_lpae' =>
...
            'post_script' => ['cesa/openswan/ipsec_build.sh']
        },
}

  <image image_name="uImage-axp-lpae"
         code_ref="linux_3.2.40_13q3_uni">
...
    </linux_image>
    <post_script>cesa/openswan/ipsec_build.sh</post_script>
  </image>