The gziped tar ball contains the pre-built Linux images for the board platform
Extract the archive
tar -zxhvf 2017.2-<board>-release.tar.xz
Release Git Tags
The Xilinx Git repositories, U-Boot and Linux, are tagged for the release with a tag of xilinx-v2017.2
FSBL The First Stage Boot Loader (FSBL) used to generate the boot.bin file is based on the 2017.2 release of the Xilinx tools.
U-Boot The release is based on U-Boot 2017.01 created from the xilinx-v2017.2 tag. More details about configuring, building and running U-Boot are located on the U-Boot and Build U-Boot pages.
Linux The release is based on a 4.9 Linux kernel created from the xilinx-v2017.2 tag. More details about configuring, building and running Linux are located on the Linux, Zynq Linux and Build Kernel pages.