Awesome

About Patmos

Patmos is a time-predictable VLIW processor. Patmos is the processor for the T-CREST project. See also: http://www.t-crest.org/ and http://patmos.compute.dtu.dk/

The Patmos Reference Handbook contains build instructions in Section 5.

For questions and discussions use the GitHub discussion area of Patmos at: https://github.com/t-crest/patmos/discussions

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:

• Patmos VM

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.

Install Quartus as instructed in the Patmos Handbook build instructions chapter.

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 git@github.com:t-crest/patmos-misc.git misc
./misc/build.sh

Without a GitHub login the ssh based clone string is:

git clone https://github.com/t-crest/patmos-misc.git misc

build.sh 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/build.sh -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
make