8.4. gem5 initrd
TODO we were not able to get it working yet: https://stackoverflow.com/questions/49261801/how-to-boot-the-linux-kernel-with-initrd-or-initramfs-with-gem5
This would require gem5 to load the CPIO into memory, just like QEMU. Grepping initrd shows some ARM hits under:
src/arch/arm/linux/atag.hh
but they are commented out.