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
Kittelfjäll 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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Sunday, January 28, 2007
Porting a Unix program to Mac OS X
After the successful porting of all my Zoo Design Platform programs from Solaris Unix to Ubuntu Linux I am ready for a new challenge; porting some of my programs from Linux to Mac OS X. Mac OS X is my favorite OS and having my programs running in Mac OS X would be a great thing. Before we can run a Linux or Unix program in Mac OS X we have to make sure we have the X11 software installed.

X11 for Mac OS X

X11 for Mac OS X offers a complete
X Window System implementation for running X11-based applications on Mac OS X. The X11 program is part of the normal Mac OS X 10.5 installation and can be found in the /Application/Utilities directory. After starting the X11 program we can start the terminal program xterm from the Program menu.

From the xterm window it is now possible to run almost any X11 compliant program compiled for Max OS X.

Xcode development environment

To compile and link programs we have to install the
Xcode development environment. The Xcode package includes the GNU Compiler Collection (GCC) and other useful tools. You can download the Xcode package from Apple's developer web site. You must be an Apple Developer Connection member to download Xcode. Online membership is free. If you have another account at Apple, enter your existing username (Apple ID) and password in the ADC Member Log In area and complete your membership registration. Or sign up today for your ADC online membership. The latest version of Xcode is 3.1.3 and it requires Mac OS X 10.5 The package is almost 1GB so you better look for a high-speed connection. The package will be installed in the Developer folder in Macintosh HD.

Get the source code

I will start by copying the Cobra source code to my MacBook.              Cobra_globals.h         Cobra_stubs.c           Make_linux
Cobra_define.h          Cobra_include.h         Cobra_tree.c            Make_macosx
Cobra_find_mac.c        Cobra_main.c            Cobra_ui.c              RunCobra
Cobra_function.c        Cobra_popup.c           Cobra_ui.h             

Header files

Header files serve two purposes.
  • System header files declare the interfaces to parts of the operating system. You include them in your program to supply the definitions and declarations you need to invoke system calls and libraries.
  • Your own header files contain declarations for interfaces between the source files of your program. Each time you have a group of related declarations and macro definitions all or most of which are needed in several different source files, it is a good idea to create a header file for them.
The header files for the xview, olgx and slingshot library functions must be included in the compilation. The xview header files can be downloaded from Physionet. The slingshot header files can be downloaded from this site.

This screen plot shows the /usr/openwin directory which is the default installation directory for the header files used in the SUN OS. This is where I put the header fils.


I use a makefile (Make_macosx) to compile and build the program. The following command is used to run the makefile:  make -f

Shared libraries

Cobra makes use of some shared libraries that are not part of the normal X11 installation. These libraries have to be compiled for Mac OS X. These libraries will be linked to the Cobra program when it is starting. The libraries can be downloaded from
here. They are included in the file cobra_9.9macosx.tar.gz.

 Library Name
 libxview.dylib  The XView toolkit
 libolgx.dylib  The OLGX toolkit (used by XView)
 libsspkg.dylib  The Slingshot toolkit

I add the following command in the startup script to tell the program where to find the shared libraries: export DYLD_LIBRARY_PATH=$INSTALL_DIR/libraries

Running Cobra

I compiled and linked the Cobra program and here it runs on my MacBook. I am happy as a child.

Download Cobra

You can download and try the Cobra program yourself. Here is the
download site.

Running X11 applications in Mac OS X

You can read more about configuring and running X11 applications in Mac OS X
here. xterm provides a significant advantage: when you start an xterm session, it sets up the X11 environment for you. You can then easily run X11 applications from the command-line. By contrast, in Terminal you need to run the /usr/bin/open-x11 script to set up the X11 environment and launch X11 applications, as shown here: /usr/bin/open-x11 ./cobra &

Launching Aqua apps from the Terminal window

One way to launch Aqua applications from the Terminal or xterm windows is the open command. To start Firefox use the following command:
open /Applications/ or
open -a /Application/

The Fink project

Fink project wants to bring the full world of Unix Open Source software to Darwin and Mac OS X. We modify Unix software so that it compiles and runs on Mac OS X ("port" it) and make it available for download as a coherent distribution. Fink uses Debian tools like dpkg and apt-get to provide powerful binary package management. You can choose whether you want to download precompiled binary packages or build everything from source. Here is a good description of how to run X11 on Darwin and Mac OS X.

Useful links

Posted at 15:40 by

December 5, 2007   02:49 AM PST
Hello, Sven!
I have read your page on compiling x11 compliant software on mac os x with great interest.
The problem I am having is following:
I would love to run línux version of Xilinx Web pack (vhdl deslgn) for one of our courses at Chalmers on my Ibook G4.
Is it possible at all to run linux version of this software on mac (ppc based) under x11?
You can mail me on this to:

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