The elfloader Kconfig isn‘t accessable in most of the top-level Kconfigs. Therefore, there are two ways to use the hashing algorithms: 1. CONFIG_HASH_INSTRUCTIONS=y in your defconfig CONFIG_HASH_SHA (optional - remove if you want to md5 hash) 2. Include the elf-loader’s Kconfig under a new menu in your top-level Kconfig like this:

     menu "Tools"
       source "tools/elfloader/Kconfig"
     endmenu

Either one of these options will allow the user to select the hashing process.

Please note, this process will add boottime, as hashing a very long file tends to take some time.