This is the Buildroot support for Zynq boards. Zynq boards are available from Xilinx and some third party vendors, but the build procedure is very similar. Currently, three boards are natively supported by Buildroot: - Xilinx ZC706 board (zynq_zc706_defconfig) - Avnet ZedBoard (zynq_zed_defconfig) - Avnet MicroZed (zynq_microzed_defconfig) Steps to create a working system for a Zynq board: 1) Configuration (do one of the following) make zynq_zc706_defconfig (ZC706) make zynq_zed_defconfig (Zedboard) make zynq_microzed_defconfig (MicroZed) 2) make 3) All needed files will be available in the output/images directory. Create a FAT32 partition at the beginning of your SD Card and copy files: - boot.bin - u-boot.img - uImage - uramdisk.image.gz (should be renamed from rootfs.cpio.uboot) - devicetree.dtb (should be renamed from zynq-***.dtb) into your SD card 4) boot your board You can alter the booting procedure by creating a file uEnv.txt in the root of the SD card. It is a plain text file in format = one per line: kernel_image=myimage modeboot=myboot myboot=... Note: The DTB for MicroZed is the same as the one for the Zedboard (zynq-zed.dtb), and this is the recommended solution, see https://forums.xilinx.com/t5/Embedded-Linux/Microzed-default-device-tree-dts/td-p/432856. References: - ZC706 information including schematics, reference designs, and manuals are available from http://www.xilinx.com/products/boards-and-kits/ek-z7-zc706-g.html. - Zedboard/Microzed information including schematics, reference designs, and manuals are available from http://www.zedboard.org . Support for other boards: If you want to build a system for other boards based on the same SoC (for ex. Digilent Zybo board), and the board is already supported by the upstream kernel and U-Boot, you simply need to change the following Buildroot options: - Kernel Device Tree file name (BR2_LINUX_KERNEL_INTREE_DTS_NAME) - U-Boot board defconfig (BR2_TARGET_UBOOT_BOARD_DEFCONFIG) Custom ps7_init_gpl.c/h support: To generate a working boot.bin image, ps7_init_gpl.c/h are required in the U-Boot source tree. Without those files, boot.bin will be built successfully but it will not be functional at all. Those files are output from the Xilinx tools, but for convenience, U-Boot includes the default ps7_init_gpl.c/h of popular boards. Those files may need to be updated for any programmable logic customizations which impact ps7_init (clock/pin setup & mapping/AXI bridge setup/etc). See board/xilinx/zynq/ directory of U-Boot for natively supported ps7_init files. If the ps7_init files for your board are not found in U-Boot, you need to add them by yourself. 1) Start with a defconfig supported by Buildroot (e.g. Zedboard) make zynq_zed_defconfig 2) make uboot-menuconfig Visit the following menu and enable CONFIG_ZYNQ_CUSTOM_INIT. ARM architecture ---> [*] Use custom ps7_init provided by Xilinx tool 3) Copy ps7_init_gpl.c/h generated by the Xilinx tools into output/build/uboot-xilinx-/board/xilinx/zynq/custom_hw_platform/ 4) make Note: The files in step 3 will need to be re-copied after cleaning the output directory and at this time, there is no way to save them as part of the buildroot configuration, except as a U-Boot patch.