systemd-boot (Previosuly, gummiboot) requires linux kernel to be built as EFISTUB https://wiki.archlinux.org/index.php/Systemd-boot However, I don't see any option in Buildroot config to build kernel as EFISTUB. What is Buildroot option to set kernel building with CONFIG_EFI_STUB=y
Minimal Linux Live does that way. https://github.com/ivandavidov/minimal/blob/master/src/02_build_kernel.sh#L81
