Changes

The typical linuxLinux-based Zynq design is composed by of the following parts:* FSBL (or U-boot SPL for BELK-4.0.0 or newer and BXELK-2.0.0 or newer)

Generally speaking, these parts - in the binary/sinthesized synthesized form - are combined together in one monolithic file that is stored in a non-volatile memory such as SPI NOR flash. Generating this file is quite easy as described by Vivado documentation. However , in real world products, this may be too rigid because developers may want to handle these parts separately and independently.Starting from BELK-4.0.0 and BXELK-2.0.0 developers can take advantages of the flexibility of U-boot dual stage bootloader support that allows to handle handling all binaries separately and independently instead of a unique monolithic file. FSBL creation through Vivado SDK environment is no longer needed. U-boot SPL bootloader is now responsible to correctly initialize the PS (Processing System) based on configurations from the Vivado project.