meta-ezynq

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This layer provides an unofficial support for Xilinx Zynq architecture as well as evaluation boards.

ezynq-u-boot creates u-boot image (SPL + u-boot) without any extra proprietary tools required. It does not support secure boot functionality and loading the FPGA (PL) part with a bitstream - it is planned to do under the control of the operating system - if needed this feature can be implemented using u-boot.

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Supported boards/machines

Boards supported by this layer:

• Elphel393
• MicroZed
• Zedboard (not tested)
• ZC706 (not tested)

Dependencies

This layer depends on:

• URI: git://git.openembedded.org/bitbake
• URI: git://git.openembedded.org/openembedded-core, layers: meta
• URI: git://github.com/MentorEmbedded/meta-sourcery.git, layers: meta-sourcery (for external toolchains only)
• URI: git://github.com/Xilinx/u-boot-xlnx.git, branch=master-next
• URI: git://git.code.sf.net/p/elphel/ezynq

Build instructions

The following instructions require a Poky installation (or equivalent).

Initialize a build using the oe-init-build-env script in Poky. Once initialized configure bblayers.conf by adding the meta-ezynq layer:

meta-ezynq \

To build a specific target BSP configure the associated machine in local.conf:

MACHINE ?= "microzed"

Build U-Boot:

$ bitbake u-boot-ezynq

or: $ bitbake virtual/bootloader or: $ bitbake u-boot

Once complete the images for the target machine will be available in the output directory tmp/deploy/images.

Images generated:

• boot.bin+u-boot.img (fsbl is not required to boot)

Extra output at build/tmp/work/.../ezynq-u-boot/${PV}_${PR}/git/u-boot-xlnx/:

• u-boot.html - configuration settings overview
• u-boot.map - the bootloader's memory map
• u-boot - ELF file

Booting

SD Card Boot

Note: This boot flow generates a bootable boot.bin.

1. Copy boot.bin and u-boot.img(if generated) onto the SD Card.

• (might not work) Copy the following to the SD card (ensure to rename the files where appropriate):
  • uImage - kernel
  • uramdisk.image.gz (core-image-minimal-.ext2.gz.u-boot) - RootFS
  • devicetree.dtb (uImage-.dtb) - Device Tree Blob
• Insert SD Card, connect UART to Terminal program and boot board (Ensure the board is configured for SD Boot).
• To get to u-boot command line press any key withing 1 second.

Develop (add new machine/board)

1. Configure the new board in build/conf/local.conf:

    MACHINE ?= "{new-board}"
   

2. Create conf/machine/.conf - use microzed.conf as a reference.

3. Edit {new-board}.conf - add:

    UBOOT_MACHINE = "{new-config-name}_config"
   

   where {new-config-name} is from boards.cfg in u-boot-xlnx plus "_config"-ending

4. Run

    bitbake ezynq-u-boot -c patch -f
   

   The command clones git repositories and add ezynq files to u-boot-xlnx.

   Note: Ezynq can be cloned and generate boot.bin apart from poky - please see Ezynq's documentation.

5. Edit ezynq files located at build/tmp/work/.../ezynq-u-boot/${PV}_${PR}/git/u-boot-xlnx/:

   • boards.cfg - add {new-config-name} if it's not in the list.

   • create a new include/configs/{new-config-name}.h - use zynq_microzed.h as a reference)

   • {new-config-name}.h needs to include the following files:

       #include <configs/ezynq/ezynq_MT41K256M16RE125.h>  /* should be before zed_ezynq.h as it overwrites DDR3L with DDR3 */
       #include <configs/ezynq/ezynq_XC7Z010_1CLG400.h>
       #include <configs/ezynq/zed_ezynq.h>
     

   • edit the included header files according to the new board configuration.

   WARNING: After the step 5 don't run bitbake ezynq-u-boot -c clean - deletes everything in build/tmp/work/.../ezynq-u-boot/${PV}_${PR}/

6. Run

    bitbake u-boot-ezynq
   

   Note: u-boot.bin (not the final boot.bin) size cannot exceed 192KB

Trademark notices

Xilinx® and Zynq® are registered trademarks of Xilinx.

Ezynq project is not endorsed by or affiliated with Xilinx Inc.