You can use Bootgen in GUI mode in the Vitis IDE for simple boot image creation, or in command-line mode for more complex boot images. You can install Bootgen from the Vivado Design Suite installer. The Vitis software platform is available for use when you install the Vivado® Design Suite, or it can be downloaded and installed individually. See the Vivado Design Suite User Guide: Release Notes, Installation, and Licensing (UG973) for all possible installation options.
To install Bootgen from Vivado, go to the Xilinx Download Site, and select the Vivado self-extracting installer. During Vivado installation, choose the option to install Vitis as well. Bootgen is included along with Vitis. You can also install Bootgen from the Vitis Installer. The Vitis self-extracting installer found on the Xilinx Download site. After you install Vitis with Bootgen, you can start and use the tool from the Vitis IDE option that contains the most common actions for rapid development and experimentation, or from the XSCT.
The command-line option provides many more options for creating a boot image. See Using Bootgen Options on the Command Line for more information.