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
Books, photos, films and videos
Weather forecasts

38000 feet above see level
A trip to Spain
Florida the sunshine state

Photo Albums
Seaside Florida
Ronda Spain
Sevilla Spain
Cordoba Spain
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
FPGA developer
FPGA Journal
FPGA World
Lesley Shannon Courses
Mac 2 Ubuntu
Programmable Logic DesignLine
World of ASIC

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Wednesday, March 19, 2014
Zynq design from scratch. Part 28.
Indirect PetaLinux boot via U-boot

Because we have configured ethernet in our evaluation system and connected the ZedBoard to the netwoork, we can use U-boot to boot PetaLinux using the TFTP server running on the host. This is much faster than loading everything using JTAG.

Copy the kernel image file to the host

As we are running the TFTP server on the host, we will use sftp to copy the kernel image file image.ub from the guest to the host. Let's open a terminal on the host and execute the following commands:

cd tftpboot
sftp svenand@
svenand@'s password:
Connected to
sftp> get /tftpboot/image.ub

Start U-boot

1. First bootstrap the system by downloading U-boot via JTAG.

petalinux-boot --jtag --prebuilt 2

2. When autoboot starts hit any key to stop it.

3. Use the help command to find out about all commands available in U-boot.

4. Check whether the TFTP server IP address is set to the IP Address of the host where the image resides.

5. In the PetaLinux console type 

print serverip

6. If not set, set the server IP addreess to the host IP address.

set serverip <HOST IP ADDRESS>

7. Confirm the IP address of the board.

print ipaddr

Boot the kernel image

8. Execute the following command in the GTKterm window:

run netboot

What netboot does is load from a TFTP host a file defined by image.ub (the tftp command), then add the TCP/IP related parameters to the kernel command string, and finally boot Linux from the just loaded image (bootm).

This time the Linux kernel boot only takes seconds. This will save us a lot of time in the future.

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Posted at 17:23 by

Larry Byars
November 7, 2014   04:31 PM PST
Sven, thank you for your useful posts. Like you, I've been envolved in computers from the late 60's (I met my first PDP-8 in 1967). My path has been mostly software based but recently I'm trying to extend my knowledge into the realms of FPGAs. Who says you can't teach an old dog new tricks? Well, this old dog is struggling, but your posts have helped quite a bit.

I wanted to mention my recent experiences with the subject of this and the last few posts. I could not get my ZedBoard to boot over jtag. It would just give all the INFO but never start the kernel. I finally put everything on an SD card and could boot using that mechanism. Yesterday I finally discovered my problem. If there is an SD card in the slot, UBoot seems to try to load it. So to get
> petalinux-boot --jtag --prebuilt 3
to work I had to remove the SD card. I discovered this when I was making changes to the rootfs but noticed that they never showed up (added gpio-demo and PrimeNumbers per your posts). Turns out that Uboot was booting the SD card which had the unmodified kernel files. Took this old bird a while to figure that one out.

Anyway, wanted to again say thank you and offer this tidbit that may help someone else.

Regards from East Tennessee

Larry Byars
Sr. Staff Scientist
Siemens Healthcare

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