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The BootLoaderSpec (BLS) defines a file format for boot configurations, so bootloaders can parse these files and create their boot menu entries by using the information provided by them [0]. This allow to configure the boot items as drop-in files in a directory instead of having to parse and modify a bootloader configuration file. If the /boot/loader/entries exists and there are BLS files there, then these are parsed and configuration sections are added without the need to have these in a zipl.conf file. A different BLS directory can be specified from the command line using the --blsdir option. [0]: https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/ GitHub-ID: #28 Signed-off-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Stefan Haberland <sth@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>