grit-iso/releng/efiboot/loader/entries/archiso-x86_64-usb.conf

title   Arch Linux archiso x86_64 UEFI USB
linux   /%INSTALL_DIR%/boot/x86_64/vmlinuz
initrd  /%INSTALL_DIR%/boot/x86_64/archiso.img
options archisobasedir=%INSTALL_DIR% archisolabel=%ARCHISO_LABEL%