You already created the PetaLinux images in Building Software for PS Subsystems. In this example, the PetaLinux is configured to build images for SD-boot with an initramfs root file system. This is the default boot setting in PetaLinux.
The images can be found in the $<PetaLinux_Project>/images/linux/ directory. For loading Linux on the APU, the following images are used from PetaLinux:
TF-A:
bl31.elfU-Boot:
u-boot.elfLinux images:
image.ub, which contains:Kernel image:
ImageDevice tree blob:
system.dtbRoot file system:
rootfs.cpio.gz.u-boot