Very useful Zynq and AXI bus tutorials.


Spent couple of my evenings watching this tutorials and found them painfully slow, but very very useful. Unfortunately for me, I'm already passed that point on my "learning curve" of Zynq and AXI4 bus, but still learned quite a few new tricks and got some ideas, especially on creation of AXI peripheral using HLS and RTL design flows. Hope, Mohammadsadegh Sadri will soon move from trivial examples to advanced topics as he promised in his videos.

Anyway, I suggest this tutorials for everyone. Very nice work Mohammadsadegh Sadri !

You can find full list of tutorials here:

PicoZed from AVnet arrived.

Yesterday, a new Zynq based SBC/SOM was released. It very similar to MicroZed boards - just without those huge Ethernet/USB connector and added versions with Z7015 and Z7030, which is nice.
Ethernet and USB got moved to 3rd 100pin's connector on a bottom of the board, so whose who needaccess to it can get it thru carrier board.
Another difference between MicroZed and PicoZed is absense of microSD connector - it got replaced with 1G/4G embedded MMC (eMMC).
Also a carrier card for PicoZed with PCIe and FMC connecor now available for purchase.

I'm not sure its a perfect solution for me, but very close. And it's very nice to have another option to choose from. Great job AVNet!




I finally received my FLIR One!!! It's kind of expansive, but very cool infra-red camera for IPhone5/5c. Can make still and video. A very nice toy :)
It has two sensors/cameras and as I understand one is infra-red and another regular. Image from regular camera passed thru some edge detection algorithm and then mixed with infra-red image.
The only 'problem' is that optimal distance for FlirOne is 1 meter+, so for close-up pictures edges and thermal picture shifted. Still gives some useful information, it's just picture don't look perfect.

So, this is how it FlirOne looks in a box, with two sensors in a middle:


A real practical application will be using it to find heat leaks in a house, pipes insulation and etc. But, of course I have to make a thermal pictures of my ZedBoard and MicroZed boards:



As you can see, where is some shift between left edge of MicroZed and where thermal image actually starts. I made this picture from the distance of about 40-50cm. So, not really useful for PCB thermal profiling. Below, just a picture of our custom 'heat spreader' for MicroZed.


And this is a ZedBoard, with heatsink+cooler mounted on Zynq.


HDMI on ZedBoard with Petalinux update.

I finally figure it out why Analog Devices reference design create/generated in Vivado 2014 by script(obviously updated to use new IP's, otherwise it didn't assemble 'Block Design' at all) didn't work. Reason is changes in Xilinx Concat IP, which used in reference design to concatenate interrupt signals from VDMA and I2C IP blocks to Zynq's F2S interrupt bus.
So, now in 2014.1, we got version 2.0 of it and it preserve the order of input signals on the output. Which means we must either change inputs order or change interrupt numbers in DTS.

So, for AD reference design generated in Vivado2014.1 interrupts are:

  • AXI_IIC_MAIN - #56.
  • AXI_VDMA_0 - #55.
  • AXI_IIC_FMC - #59.


HDMI on ZedBoard with Petalinux.

This is step-by-step tutorial on how to build reference design for Analog Devices ADV7511 HDMI encoder used on ZedBoard with PetaLinux 2013.10. It will be mostly based on AD HDL reference design and AD Linux drivers wiki page and Xilinx PetaLinux documentation

As of today, 25 May 2014, to create HDL design for ADV7511 from scratch, we have to use Vivado 2013.4, even though Vivado 2014.1 is already available. The reason is some changes in a Xilinx IP's (which I didn't had a chance to figure out yet) prevent HDL design from build/work properly.

  1. First step is to download HDL libraries and projects from AnalogDevices repositories on a github: You can clone it or download a ZIP. I will download a ZIP and extract 'hdl-master' in my Projects/FPGA/ folder on Windows7 machine.
  2. Second step is to build a few Analog Devices IP required to create ZedBoard HDMI design. Run Xilinx Vivado 2013.4, open a TCL console, change directories and 'source' a .tcl scripts. For example, to build AXI_CLKGEN IP:

    cd c:/Projects/FPGA/hdl-master/library/axi_clkgen
    source ./axi_clkgen_ip.tcl

    After script finish, close created project and build the next. For ZedBoard we have build the next IP's:

    • hdl-master/library/axi_clkgen
    • hdl-master/library/axi_hdmi_tx
    • hdl-master/library/axi_i2s_adi
    • hdl-master/library/axi_spdif_tx
    • hdl-master/library/util_i2c_mixer
  3. After we done with all required IP's, we can build ADV7511 reference design for ZedBoard. In a Tcl Console change directory to ADV7511 and run 'system_project' script.

    cd c:/Projects/FPGA/hdl-master/projects/adv7511/zed/
    source ./system_project.tcl

    Script will create block design, run synthesis and implementation, generate bitstream and even export software to SDK(without opening it). This was the case on my system - everything went smoothly. We are done with Vivado and can close it.

    We have to create HDL in Vivado 2013.4, but later we can import created project into Vivado 2014.1 and update it to use latest Xilinx IP's.

  4. Let's build a FSBL. We need very typical Zynq first stage boot loader and I covered creation of it before, so now just a short description:
    • Run XSDK.
    • Create new 'Hardware Platform Specification' project (I named it 'ZedBoard-HDMI-HW') and specify HW created in a previous step.
    • Create Application project (named 'ZedBoard-HDMI-FSBL') using our new 'Hardware Platform' and select to create new BSP for it. Don't forget to use 'Zynq FSBL' template. Build it if this not done automatically.
  5. Next step is to create PetaLinux BSP. This is also very typical PetaLinux BSP, just don't forget to change 'Configuration' to reflect ZedBoard configuration and name it 'ZedBoard-HDMI-petalinux_bsp'.


    We are done with Xilinx SDK. You can close it.

  6. Next step is to create PetaLinux project and set 'hardware description'. I will call it 'ZedBoard-HDMI' Petalinux project:

    petalinux-create -t project -n ZedBoard-HDMI
    cd ~/Projects/ZedBoard-HDMI-petalinux_bsp/
    petalinux-config --get-hw-description -p ../ZedBoard-HDMI/
    cd ~/Projects/ZedBoard-HDMI/
    rm -r hw-description

  7. Now, as of today, ADV7511 Linux driver not in a mainstream kernel. So, we need to get Kernel from Analog Devices repository with appropriate patches. Current version is 3.14.0. Let's clone it, and checkout 'xcomm_zynq' branch.

    cd ~/Projects/
    git clone analogdevices-kernel
    cd analogdevices-kernel/
    git checkout xcomm_zynq

  8. Create necessary directories and copy 'xcomm_zynq' branch to our PetaLinux project directory.

    cd ~/Projects/
    mkdir ~/Projects/ZedBoard-HDMI/components
    mkdir ~/Projects/ZedBoard-HDMI/components/linux-kernel
    cp -a analogdevices-kernel ~/Projects/ZedBoard-HDMI/components/linux-kernel/

  9. Run 'petalinux-config' and change kernel to 'analogdevices-kernel' and system boot device to 'SD card'.
  10. cd ZedBoard-HDMI

  11. Next we need to configure Linux kernel for PetaLinux and we need to enable all options required by ADV7511. AnalogDevices kernel support special configuration option 'zynq_xcomm_adv7511_defconfig', but we cannot run it with PetaLinux. So, we have to pre-configure kernel separately ('make ARCH=arm zynq_xcomm_adv7511_defconfig') and just copy resulted config into 'ZedBoard-HDMI/subsystems/linux/configs/kernel'. So, I did it and also copied it into PetaLinux Kernel configs directory '/opt/petalinux-v2013.10-final/etc/template/project/template-zynq/subsystems/linux/configs/kernel'. So, I can later reuse it. Also notice that kernel default config file have dot in the front and PetaLinux files don't.
    Anyway, here is link to my resulted kernel config file:
  12. We also, have to modify 'devices tree' generated by PetaLinux for our project. AnalogDecices Linux kernel have template for ZedBoard which you can find in 'arch/arm/boot/dts/zynq-zed-adv7511.dts', so we basically have to copy missing devices from AD into our tree.
    Link to my resulted DTS file for ZedBoard:
  13. We are basically done. At this point you my want to modify PetaLinux project, for example, include Qt5 library and test app to check frame buffer device later. I covered this topics in my previous post, so I wont repeat it here.

    Build Petalinux project, create BOOT.BIN and copy it together with Linux image file 'image.ub' on SD card:

    petalinux-package --boot --fsbl ../ZedBoard-HDMI-FSBL/Release/ZedBoard-HDMI-FSBL.elf --fpga ../ZedBoard-HDMI-HW/system_top.bit --uboot --force -o images/linux/BOOT.BIN

  14. Insert SD card into slot of ZedBoard and turn it on. During boot kernel should detect ADV7511(hdmi) and ADAU1761(sound) devices and create '/dev/fb0' device.So, below partial bootlog from my ZedBoard:
  15. ...
    [drm] Initialized drm 1.1.0 20060810
    platform 70e00000.axi_hdmi: Driver axi-hdmi requests probe deferral
    adv7511-hdmi-snd adv7511_hdmi_snd.2: adv7511 <-> 75c00000.axi-spdif-tx mapping ok
    zed-adau1761-snd zed_sound.3: adau-hifi <-> 77600000.axi-i2s mapping ok
    Console: switching to colour frame buffer device 180x56
    axi-hdmi 70e00000.axi_hdmi: fb0:  frame buffer device
    axi-hdmi 70e00000.axi_hdmi: registered panic notifier
    [drm] Initialized axi_hdmi_drm 1.0.0 20120930 on minor 0
    /analogdevices-kernel/drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
    ALSA device list:
      #0: HDMI monitor
      #1: ZED ADAU1761
    Freeing unused kernel memory: 23356K (c062b000 - c1cfa000)
    INIT: version 2.88 booting
    Starting Bootlog daemon: bootlogd.
     _____       _           _      _
    | ___ \     | |         | |    (_)
    | |_/ / ___ | |_   __ _ | |     _  _ __   _   _ __  __
    |  __/ / _ \| __| / _` || |    | || '_ \ | | | |\ \/ /
    | |   |  __/| |_ | (_| || |____| || | | || |_| | >  <
    \_|    \___| \__| \__,_|\_____/|_||_| |_| \__,_|/_/\_\
    PetaLinux v2013.10 (Yocto 1.4) ZedBoard ttyPS0
    ZedBoard login: root
    login[923]: root login  on `ttyPS0'
    root@ZedBoard:~# ls /dev/fb0
    root@ZedBoard:~# uname -a
    Linux ZedBoard 3.14.0-g681a2d8-dirty #2 SMP PREEMPT Sun May 25 22:46:28 EDT 2014 armv7l GNU/Linux
  16. This is basically it - once you have a framebuffer device you can start using it. So I ran my Qt5 test app and it worked. We obviously don't have any hardware acceleration with this HDL design, but we got basic FB device and HDMI output. Congratulations!