+ "boot_a_script=" \
+ "load ${devtype} ${devnum}:${distro_bootpart} " \
+ "${scriptaddr} ${prefix}${script}; " \
+ "env exists secureboot && load ${devtype} " \
+ "${devnum}:${distro_bootpart} " \
+ "${scripthdraddr} ${prefix}${boot_script_hdr} " \
+ "&& esbc_validate ${scripthdraddr};" \
+ "source ${scriptaddr}\0" \