The &architecture; boot loader is called elilo. It is modeled on the lilo boot loader for the x86 architecture and uses a similar configuration file. However, instead of writing an MBR or partition boot record to the disk, it copies the necessary files to a separate FAT formatted disk partition and modifies the EFI Boot Manager menu in the firmware to point to the files in the EFI partition. The elilo boot loader is really in two parts. The /usr/sbin/elilo command manages the partition and copies file into it. The elilo.efi program is copied into the EFI partition and then run by the EFI Boot Manager to actually do the work of loading and starting the Linux kernel. The elilo configuration and installation is done as the last step of installing the packages of the base installation. &d-i; will present you with a list of potential disk partitions that it has found suitable for an EFI partition. Select the partition you set up earlier in the installation, typically a partition on the same disk that contains your root filesystem. The criteria for selecting a partition is that it is FAT format filesystem with its boot flag set. &d-i; may show multiple choices depending on what it finds from scanning all of the disks of the system including EFI partitions of other system disks and EFI diagnostic partitions. Remember, the elilo may format the partition during the installation, erasing any previous contents! The EFI partition is a FAT filesystem format partition on one of the hard disks of the system, usually the same disk that contains the root filesystem. It is normally not mounted on a running system as it is only needed by the EFI Boot Manager to load the system and the installer part of the elilo writes to the filesystem directly. The /usr/sbin/elilo utility writes the following files into the efi/debian directory of the EFI partition during the installation. Note that the EFI Boot Manager would find these files using the path fsn:\efi\debian. There may be other files in this filesystem as well over time as the system is updated or re-configured. elilo.conf This is the configuration file read by the boot loader when it starts. It is a copy of the /etc/elilo.conf with the filenames re-written to refer to files in the EFI partition. elilo.efi This is the boot loader program that the EFI Boot Manager runs to boot the system. It is the program behind the Debian GNU/Linux menu item of the EFI Boot Manager command menu. initrd.img This is the initial root filesystem used to boot the kernel. It is a copy of the file referenced in the /etc/elilo.conf. In a standard Debian installation it would be the file in /boot pointed to by the symbolic link /initrd.img. readme.txt This is a small text file warning you that the contents of the directory are managed by the elilo and that any local changes would be lost at the next time /usr/sbin/elilo is run. vmlinuz This is the compressed kernel itself. It is a copy of the file referenced in the /etc/elilo.conf. In a standard Debian installation it would be the file in /boot pointed to by the symbolic link /vmlinuz.