Hi everyone, I hope you’re okay. I was following this post by PeterOgden to create a Pynq 2.7 image for Zybo-Z7 and thought in sharing my experience.
- The files used in the process can be found here: Zybo-Z7 files.
- Pynq 2.7 for Zybo-Z7 image.
- Demostration video.
For those interested in recreating the image you can follow these stages.
1. Create the Board Support Package (BSP) (30 min approx.)
Although the Pynq-Z2 and the Zybo-Z7 have the same FPGA (i.e. xc7Z020-clg400), they present some differences. So, the following specifications should be considered for the Zybo-Z7.
- DDR part number: MT41K256M16 RE-125.
- The PS UART1 is routed to the FTDI instead of the UART0 for the Pynq-Z2.
- The Crystal oscillator has a frequency of 33.3333 MHz.
The Zybo-Z7/petalinux_bsp/hardware_project/zyboz7.tcl file was modified to considered the aforementioned. Also, the block diagram for the bsp is shown in bd_layout.pdf (38.4 KB).
- $ source /tools/Xilinx/Vitis/2020.2/settings.sh
- $ source ~/petalinux/2020.2/settings.sh
- $ petalinux-util --webtalk off
- Make sure that ~/PYNQ/boards/Zybo-Z7/Zybo-Z7.spec has the line BSP_Zybo-Z7 :=
- $ cd ~/PYNQ/sdbuild
- $ make bsp BOARDDIR=/home/user/PYNQ/boards BOARDS=“Zybo-Z7”
- copy the bsp file from ~/PYNQ/sdbuild/output/bsp/Zybo-Z7/xilinx-zyboz7-2020.2.bsp to ~/PYNQ/boards/Zybo-Z7/. Thus, along the Zybo-Z7.spec.
- Add the bsp to the Zybo-Z7.spec: BSP_Zybo := xilinx-zyboz7-2020.2.bsp.
2. Create the image (2h30 min approx.)
To make the port process simple, I deleted the logictools overlay and reduce the base overlay deleting the Arduino and Raspberry Pi peripherals. Also, I modified the Makefile inside the sdbuild folder to avoid compiling for all the boards (Pynq-Z1, Pynq-Z2, ZCU-104, sw_repo). The changes are after the Pynq repository is cloned in line 65 (you can check this changes in the file Makefile_sdbuild shared).
This changes also affect the ~/PYNQ/build.sh file.
The base overlay block diagram is shown in bd_layout.pdf (107.0 KB). Also the constraints file base.xdc was updated from the Zybo-Z7 master xdc.
The steps used were:
- Download the PYNQ rootfs arm v2. 7 found in PYNQ - Python productivity for Zynq - Board The downloaded file is named focal.arm.2.7.0_2021_11_17.tar.gz and will be placed in ~/PYNQ/sdbuild/.
- $ cd ~/PYNQ/sdbuild
- $ make BOARDDIR=/home/user/PYNQ/boards BOARDS=“Zybo-Z7” PREBUILT=focal.arm.2.7.0_2021_11_17.tar.gz nocheck_images
- Wait patiently, be happy
The image file named Zybo-Z7-2.7.0.img will be stored in ~/PYNQ/sdbuild/output. Its size will be around 7.6 GB.
3. Copy image to micro SD card (20 min approx.)
The steps used were:
- $ cd ~/PYNQ/sdbuild/output
- $ df -h
- Select the device corresponding to your SD card. Be careful, you could damage your OS if choose wrong.
- $ umount /dev/sXX1 (for instance mine was in /dev/sdb1).
- $ sudo dd bs=4M if=Zybo-Z7-2.7.0.img of=/dev/sXX status=progress
That’s it 
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I know these instructions can be vague and lack of deep explanations. But my intention is to share the stages I followed, so you can adjust them to your own needs.
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