TityraCore Z7 SODIMM FPGA

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How to run PetaLinux on TityraCore Z7 SODIMM FPGA

186 views March 22, 2024 milna-ms 0

Introduction

PetaLinux is a development environment provided by Xilinx for creating embedded Linux systems targeted for their FPGA  devices. It offers a streamlined workflow for building custom Linux distributions tailored to the specific requirements of embedded applications running on Xilinx FPGAs. It offers the developer the  flexibility, scalability, and robustness for a wide range of embedded applications. It simplifies the process of integrating custom hardware IP cores, drivers, and user applications into a unified Linux-based platform. This article will help you to create PetaLinux project and run it on TityraCore Z7 SODIMM FPGA. So, let’s jump straight into it.

Structure to run the PetaLinux

  • Section 1: Creating the Zynq7 processor based design on TityraCore Z7
  • Section 2: Creating the PetaLinux project
  • Section 3: Adding the Devicetree
  • Section 4: Building the project and Running PetaLinux on TityraCore Z7

Prerequisites:

For following this article, you would require:

  • Hardware:
    • TityraCore Z7 SODIMM FPGA
    • Xilinx Platform Cable JTAG debugger
    • Ethernet Cable
  • Software:
    1. Xilinx Vivado 2022.1 installed on either Windows or Linux system
    2. Linux system( Ubuntu 20.04.6 LTS)
    3. PetaLinux 2022.1

Section 1: Creating the Zynq7 processor based design on TityraCore Z7

Step 1:

Start Vivado Design Suite, and select “Create Project” from Quick Start section. The project wizard will pop up.  Press next to proceed with creating the project.

Step 2:

Type in a project name and save it at a convenient location. For this example “petalinux_tityra” is used as project name, but feel free to use any name. Select the check box below to keep all project files in a single folder. The image below shows the settings for the example project. Click “Next” to continue.

Step 3:

Choose “RTL Project” as project type and check the option “Do not specify sources at this time”.

Step 4:

At the “Default Part” step, select “Parts” and choose Family as “Zynq-7000”. Select the part number “xc7z020clg484-1” and click “Next”.

Step 5:

Under Flow Navigator, select “Create Block Design” in IP Integrator. Give an appropriate name to design. We will call it “tityra” for example.

Step 6:

Go to Diagram window, right click and select “Add IP” from the popup menu. Search for ZYNQ7 Processing System. Add it to block design by double clicking.

Step 7:

Download the preconfigured ZYNQ7 Processing System IP preset for TityraCore board here. To apply the preset, double click on the IP, select “Preset” and click on “Apply configuration”. A window will pop up, select the location where you have downloaded the preset. Click  “ok” to confirm the customization.

Select “Run Block Automation” in the above right corner of the window and select “ok” in the upcoming window. To assign IIC_0 and IIC_1 as external, right-click on each and choose the “Make External” option. The resulting image of the IP will resemble the following.

Step 8:

Now we have to add constraints for the external IIC_0 and IIC_1 port.In the “Project Manager”, select “Add sources” and select “add or create constraints”. Select “create file” and give necessary name for constraint file. Here we are using the name “tityra”, feel free to use any name.

 

Double-click the XDC file to open it, then paste the following constraint set.

set_property -dict {PACKAGE_PIN V7 IOSTANDARD LVCMOS33} [get_ports IIC_0_0_scl_io]; # eeprom scl
set_property -dict {PACKAGE_PIN W7 IOSTANDARD LVCMOS33} [get_ports IIC_0_0_sda_io]; # eeprom sda
set_property -dict {PACKAGE_PIN W17 IOSTANDARD LVCMOS33} [get_ports IIC_1_0_scl_io]; # RTC scl
set_property -dict {PACKAGE_PIN W18 IOSTANDARD LVCMOS33} [get_ports IIC_1_0_sda_io]; # RTC sda

Step 9:

Go to “Sources” tab, right click on “tityra” design file and select “Create HDL Wrapper”. Click OK on the window that appears to finish generating wrapper.

Step 10:

Click “Generate Bitstream” under PROGRAM AND DEBUG section and click “Yes” in any subsequent dialog window which comes up.

Step 11:

Once the bitstream is successfully generated, close any “Bitstream Generation Completed” dialog which comes up asking for what to do next.

Go to File -> Export -> Export Hardware…

Check “Include bitstream”, keep “Export to:” default, and click OK.

Step 12:

Open terminal in the location of PetaLinux installation Directory and Set Up PetaLinux Working Environment.

source <path-to-installed-PetaLinux>/settings.sh

Step 13:

Create new project in a convenient location using zynq template. For this example, “tityra_peta” is used as project name, but feel free to use any name. Type the command given below.

petalinux-create -t project -n New_project/tityra_peta --template zynq

Change the working directory to newly created project location using the command:

cd New_Project/tityra_peta

Step 14:

Include the XSA file, which is generated in the Vivado Design Suite, to this location by specifying the appropriate path.

petalinux-config --get-hw-description=<path-to-xsa>/tityra_wrapper.xsa

A misc/config system configuration menu will appear, go to Subsystem AUTO Hardware Settings –> Ethernet Settings –> unselect Obtain IP address automatically. Keep all other settings as default and Exit the configuration menu by selecting Exit–> Yes.

Step 15:

Execute the provided command to configure the root file system, and rootfs menu will appear.

petalinux-config -c rootfs

Enable the following packages:

  • Filesystem packages –> admin –> sudo –> sudo
  • Filesystem packages –> base –> i2c – tools –> i2c – tools
  • Filesystem packages –> console –> network –> dropbear –> dropbear
  • Filesystem packages –> console –> network –> ethtool –> ethtool
  • Filesystem packages –> console –> utils –> grep –> grep
  • Image Features –> auto – login

Save and exit the configuration file.

Step 16:

Add the following lines to the devicetree file located in <path-to-project>/ project-spec/meta-user/recipes-bsp/device-tree/files/system-user.dtsi

&gem1 {
   phy-handle = <&phy1>;
   ps7_ethernet_1_mdio: mdio {
      #address-cells = <1>;
      #size-cells = <0>;
      phy1: phy@0 {
         compatible = "micrel,ksz9031";
         device_type = "ethernet-phy";
         reg = <0>;
      };
   };
};

/ {
    usb_phy0:usb_phy@0 {
        compatible="usb-nop-xceiv";
        #phy-cells = <0>;
    };
};

&usb0 {
   dr_mode = "otg";
   usb-phy = <&usb_phy0>;
};

&i2c0 {
  status = "okay"; 
  clock-frequency = <400000>;
  #address-cells = <1>; 
        #size-cells = <0>;
        eeprom: eeprom@51
            {
               compatible = "atmel,24c02";
               reg = <0x51>;
            };
};

&i2c1 {                         
    status = "okay"; 
    clock-frequency = <100000>; 
    #address-cells = <1>; 
    #size-cells = <0>;    

    //  RTC 
    rtc0:rtc-ti@68 {
             compatible = "ti,bq32000"; 
             reg = <0x68>; 
    };
};

Step 15:

Now build the entire project using the command mentioned below. This will take a while.

petalinux-build

Step 16:

After building the project successfully, let’s powerup the board for programming. Make sure the board is in JTAG boot mode configuration. Open any serial terminal (Putty, TeraTerm..) for observing output and connect Ethernet cable to check ethernet connectivity. Use the following command for programming the board.

petalinux-boot --jtag --u-boot --fpga --kernel

Step 17:

If everthing went well, the board will start booting.

To check whether the ethernet connection is established, use the command:

ifconfig -a

You will get the output as shown below.

This approach allows us to test various functionalities such as OTG, MAC ID of EEPROM, RTC, and more.

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