New Horizons

Welcome to my blog

My name is Sven Andersson and I
work as a consultant in embedded
system design, implemented in ASIC
and FPGA.
In my spare time I write this blog
and I hope it will inspire others to
learn more about this fantastic field.
I live in Stockholm Sweden and have
my own company


You are welcome to contact me
and ask questions or make comments
about my blog.


New Horizons
What's new
Starting a blog
Writing a blog
Using an RSS reader

Zynq Design From Scratch
Started February 2014
1 Introduction
Changes and updates
2 Zynq-7000 All Programmable SoC
3 ZedBoard and other boards
4 Computer platform and VirtualBox
5 Installing Ubuntu
6 Fixing Ubuntu
7 Installing Vivado
8 Starting Vivado
9 Using Vivado
10 Lab 1. Create a Zynq project
11 Lab 1. Build a hardware platform
12 Lab 1. Create a software application
13 Lab 1. Connect to ZedBoard
14 Lab 1. Run a software application
15 Lab 1. Benchmarking ARM Cortex-A9
16 Lab 2. Adding a GPIO peripheral
17 Lab 2. Create a custom HDL module
18 Lab 2. Connect package pins and implement
19 Lab 2. Create a software application and configure the PL
20 Lab 2. Debugging a software application
21 Running Linux from SD card
22 Installing PetaLinux
23 Booting PetaLinux
24 Connect to ZedBoad via ethernet
25 Rebuilding the PetaLinux kernel image
26 Running a DHCP server on the host
27 Running a TFTP server on the host
28 PetaLinux boot via U-boot
29 PetaLinux application development
30 Fixing the host computer
31 Running NFS servers
32 VirtualBox seamless mode
33 Mounting guest file system using sshfs
34 PetaLinux. Setting up a web server
35 PetaLinux. Using cgi scripts
36 PetaLinux. Web enabled application
37 Convert from VirtualBox to VMware
38 Running Linaro Ubuntu on ZedBoard
39 Running Android on ZedBoard
40 Lab2. Booting from SD card and SPI flash
41 Lab2. PetaLinux board bringup
42 Lab2. Writing userspace IO device driver
43 Lab2. Hardware debugging
44 MicroZed quick start
45 Installing Vivado 2014.1
46 Lab3. Adding push buttons to our Zynq system
47 Lab3. Adding an interrupt service routine
48 Installing Ubuntu 14.04
49 Installing Vivado and Petalinux 2014.2
50 Using Vivado 2014.2
51 Upgrading to Ubuntu 14.04
52 Using Petalinux 2014.2
53 Booting from SD card and SPI flash
54 Booting Petalinux 2014.2 from SD card
55 Booting Petalinux 2014.2 from SPI flash
56 Installing Vivado 2014.3

Chipotle Verification System

EE Times Retrospective Series
It all started more than 40 years ago
My first job as an electrical engineer
The Memory (R)evolution
The Microprocessor (R)evolution

Four soft-core processors
Started January 2012
Table of contents
OpenRISC 1200
Nios II

Using the Spartan-6 LX9 MicroBoard
Started August 2011
Table of contents
Problems, fixes and solutions

FPGA Design From Scratch
Started December 2006
Table of contents
Acronyms and abbreviations

Actel FPGA design
Designing with an Actel FPGA. Part 1
Designing with an Actel FPGA. Part 2
Designing with an Actel FPGA. Part 3
Designing with an Actel FPGA. Part 4
Designing with an Actel FPGA. Part 5

A hardware designer's best friend
Zoo Design Platform

Installing Cobra Command Tool
A processor benchmark

Porting a Unix program to Mac OS X
Fixing a HyperTerminal in Mac OS X
A dream come true

Stockholm by bike

The New York City Marathon

Kittelfjall Lappland

Tour skating in Sweden and around the world
Wild skating
Tour day
Safety equipment
A look at the equipment you need
Skate maintenance
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38000 feet above see level
A trip to Spain
Florida the sunshine state

Photo Albums
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Ronda Spain
Sevilla Spain
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Alhambra Spain
KittelfjÀll Lapland
Landsort Art Walk
Skating on thin ice

100 Power Tips for FPGA Designers

Adventures in ASIC
Computer History Museum
Design & Reuse
d9 Tech Blog
EDA Cafe
EDA DesignLine
Eli's tech Blog
FPGA Arcade
FPGA Central
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FPGA Journal
FPGA World
Lesley Shannon Courses
Mac 2 Ubuntu
Programmable Logic DesignLine
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Sunday, March 16, 2014
Zynq design from scratch. Part 25.
Rebuilding the PetaLinux reference design

So far, we have tested the PetaLinux reference design pre-built software image both with QEMU and on hardware. We can also rebuild the reference design. The following blog entry describe how to do it and how to test the resulting image.

Setting up the transfer directory

We will create a directory called /tftpboot and allow everyone full access. The result from the PetaLinux build will be copied to this directory.

-> sudo mkdir /tftpboot
-> sudo chmod -R 777 /tftpboot
-> sudo chown -R nobody /tftpboot

Compiling the PetaLinux design software

Run petalinux-build command to compile the software image.

-> cd <Project Dir>/
-> source /opt/PetaLinux/
-> petalinux-build

This will take a few minutes.

The final kernel image is the "zImage" for Zynq. The result from the compilation will be stored in two places.

1. In the /tftpboot directory

2. In the project directory

Test new software with QEMU

We use the command:

-> petalinux-boot --qemu --kernel

to boot the image file zImage.

PetaLinux running in QEMU.

To terminate QEMU type ctrl-a and then x

Test the new software on hardware

1. Use petalinux-boot to program the FPGA with the reference design pre-built bitstream.

-> petalinux-boot --jtag --prebuilt 1

2. Use petalinux-boot to download the built Linux image to the board and boot it.

-> petalinux-boot --jtag --kernel

We got an error. Unable to download the image. Doesn't say much. Anyone has an answer? Let's try another solution.

Make a prebuilt package

We will use the command petalinux-package to packages all files into a prebuilt package and then use the command: petalinix-boot --jtag --prebuilt 3 to boot the ZedBoard. Before we can do that we have to make some preparations.

1. Copy the file bitstream file to the working directory:

-> cp pre-built/linux/implementation/download.bit .

2. Copy the first stage boot loader file to the images/linux directory:

-> cp pre-built/linux/images/zynq_fsbl.elf images/linux/.

3. Rename the prebuilt directory (just in case)

-> mv pre-built pre-built.orig

Generate the prebuilt package

We are now ready to generate the package:

->petalinux-package --prebuilt --fpga download.bit

Reset the ZedBoard

Before we can configure the board again we must reset the board. The reset button on the board will not perform a complete reset. The only solution I have found is to power off the ZedBoard. Anyone has a better solution?

Load and boot PetaLinux

->petalinux-boot --jtag --prebuilt 3

This time it works.

Top   Previous   Next

Posted at 15:33 by

July 21, 2015   12:21 PM PDT
First off, thanks for the excellent blog. It has been a great help in getting my Zynq project up and running.

I have been getting similar errors to the above while trying to boot an updated kernel over jtag under the following environment
CentOS 7
Vivado 2015.2
Petalinux 2015.2
Zedboard RevC

While your steps to update the pre-built images worked for me, I found the following command also will work and perhaps is more standard:

$ petalinux-boot --jtag --fpga --bitstream pre-built/linux/implementation/download.bit --u-boot --kernel

Hope this helps someone else.
April 1, 2015   03:11 AM PDT
Hi Sven,

Thank you for such wonderful blog.

I ran into same errors. I am using petalinux 2014.2+ Zybo bsp in Ubuntu 14.04 LTS, 64 bit machine.

Here's the solution: (It worked for me)

December 2, 2014   10:54 AM PST
I am getting the same error message as Murad. What is the fix ?

I am stuck.

I have created the tftpboot directory in Projects/Petalinux/

Error :

INFO: Checking component...
INFO: Generating make files and build linux
INFO: Generating make files for the subcomponents of linux
INFO: Building linux
[INFO ] pre-build linux/rootfs/fwupgrade
[INFO ] pre-build linux/rootfs/peekpoke
[INFO ] pre-build linux/rootfs/uWeb
[INFO ] build linux/kernel
[INFO ] update linux/u-boot source
[INFO ] generate linux/u-boot configuration files
[INFO ] build linux/u-boot
[INFO ] Expanding stagefs
[ERROR] E: Sub-process /opt/Petalinux/petalinux-v2014.2-final/tools/packagemanager/bin/dpkg returned an error code (127)
[ERROR] make[2]: *** [.pkg_stagefs] Error 255
[ERROR] make[1]: *** [sub_build_component_/none/packages-repo/single/plnx-repo] Error 2
ERROR: Failed to build linux
September 16, 2014   11:54 PM PDT
You said you were able to download a new kernel to the ZedBoard over JTAG after you added the following libraries.


I believe that you're running Ubuntu, but I'm running Centos 6.5. Do I need to load a different set of libraries for CentOS?

FWIW, I'm seeing the exact same errors as Ivan reports on his July 8 post.

August 21, 2014   08:35 PM PDT
I installed the following libraries and got it to work.

July 13, 2014   07:05 PM PDT
I am using Ubuntu 14.04 LTS, PetaLinux 2014.2, 64-bit machine.
I am getting the following error trying to execute:

[ERROR] E: Sub-process /opt/PetaLinux/petalinux-v2014.2-final/tools/packagemanager/bin/dpkg returned an error code (127)
[ERROR] make[2]: *** [.pkg_stagefs] Error 255
[ERROR] make[1]: *** [sub_build_component_/none/packages-repo/single/plnx-repo] Error 2
ERROR: Failed to build linux

Any idea please
July 8, 2014   10:24 AM PDT
Regarding error after
-> petalinux-boot --jtag --kernel
I have the same error with zc706 board and its support package.
But if running with verbose flag:
-> petalinux-boot -v --jtag --kernel
I get a following error message:
XMD% XMD% Downloading Data File -- /opt/Xilinx/petalinux-v2014.2-final/Xilinx-ZC706-2014.2/images/linux/zImage at 0x00008000
Progress ..................ERROR:
Access aborted (DSCR=0x4b186043)
Error Address = 0x00030000, Size = 0x00000004

XMD% ERROR: Write value 0x00008000 to Register 15 failed

AP transaction timeout: ACK = 0x01, expected=0x02)

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