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Patmos is a time-predictable VLIW processor, and the processor for the T-CREST project

Project README

About Patmos

Patmos is a time-predictable VLIW processor. Patmos is the processor for the T-CREST project. See also: and

The Patmos Reference Handbook contains build instructions in Section 5.

For questions and discussions use the GitHub discussion area of Patmos at:

Getting Started

In the following the installation and of the T-CERST/Patmos tools and design on a Linux machine is described.

A Virtual Machine for Development

However, we also provide a VMWare virtual machine with Ubuntu 20.04 and all tools installed and compiled at:

The user id is patmos and the password is also patmos.

Linux (Ubuntu) based Installation

Several packages need to be installed. The following apt-get lists the packages that need to be installed on a Ubuntu Linux:

sudo apt-get install git openjdk-11-jdk gitk cmake make g++ texinfo flex bison \
  subversion libelf-dev graphviz libboost-dev libboost-program-options-dev ruby-full \
  liblpsolve55-dev zlib1g-dev gtkwave gtkterm scala autoconf libfl2 expect verilator curl

Install sbt according to the instructions from sbt download

We assume that the T-CREST project will live in $HOME/t-crest. Before building the compiler, add the path to the compiler executables into your .bashrc or .profile:

export PATH=$PATH:$HOME/t-crest/local/bin

Use an absolute path as LLVM cannot handle a path relative to the home directory (~). Logout and login again to make your new PATH setting active.

Patmos and the compiler can be checked out from GitHub and are built as follows:

mkdir ~/t-crest
cd ~/t-crest
git clone [email protected]:t-crest/patmos-misc.git misc

Without a GitHub login the ssh based clone string is:

git clone misc will checkout several other repositories (the compiler, library, and the Patmos source) and build the compiler and the Patmos simulator. Therefore, take a cup of coffee and find some nice reading (e.g., the Patmos Reference Handbook).

You can also install (quicker) the precompiled tools with:

./misc/ -q

Hello World

We can start with the standard, harmless looking Hello World:

main() {
    printf("Hello Patmos!\n");

With the compiler installed it can be compiled to a Patmos executable and run with the sw simulator and the hardware emulation as follows:

patmos-clang hello.c
pasim a.out
patemu a.out

However, this innocent examples is quite challenging for an embedded system. For further details and how to build Patmos for an FPGA see Section 6 in the Patmos Reference Handbook.

You can also build the Patmos handbook yourself from the source. You first need to install LaTeX (about 3 GB) with:

sudo apt-get install texlive-full doxygen

The handbook is then built with:

cd patmos/doc
Open Source Agenda is not affiliated with "Patmos" Project. README Source: t-crest/patmos
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