PetaLinux tool has system software components (embedded software, TF-A, Linux, U-Boot, OpenAMP, and Yocto framework) and host tool components ( Vivado® Design Suite and Vitis™ software development platform). To upgrade to the latest system software components only, you need to install the corresponding host tools.
petalinux-upgrade command resolves this
issue by upgrading the system software components without changing the host tool
components. The system software components are upgraded in two steps: first, by
upgrading the installed PetaLinux tool, and then by upgrading existing PetaLinux
projects. This allows you to upgrade without having to install the latest version of
the Vivado hardware project or Vitis software platform.