The following example shows how to create a boot image with applications running on different cores. The pmu_fw.elf is loaded by BootROM. The fsbl_a53.elf is the bootloader and loaded on to A53-0 core. The app_a53.elf is executed by A53-1 core, and app_r5.elf by r5-0 core.
the_ROM_image:
{
[pmufw_image] pmu_fw.elf
[bootloader, destination_cpu=a53-0] fsbl_a53.elf
[destination_cpu=a53-1] app_a53.elf
[destination_cpu=r5-0] app_r5.elf
}