hello markus.gruber4,
you may include --no-flash options to flash scripts, it’ll perform all steps except physically flashing the board.
if you also adding -k options to specify partition name, (i.e. kernel-dtb), it’ll generate signed and encrypted device tree binary locally.
please refer to Flash Script Usage for command descriptions.
BTW,
it’s also CBoot feature to look extlinux.conf configuration file for loading binaries.
you may refer to CBoot chapter, and check [Kernel Boot Sequence Using extlinux.conf] session for more details.
thanks