This is a modified version of the Erlang runtime system that can run Erlang on the Epiphany co-processor, most commonly found on the [Parallella] 2 single-board computer.

Erlang is a programming language used to build massively scalable soft real-time systems with requirements on high availability. Some of its uses are in telecom, banking, e-commerce, computer telephony and instant messaging. Erlang's runtime system has built-in support for concurrency, distribution and fault tolerance.

OTP is set of Erlang libraries and design principles providing middle-ware to develop these systems. It includes its own distributed database, applications to interface towards other languages, debugging and release handling tools.

Please see the [erlang/otp] 3 repository for upstream Erlang/OTP.

BEAM is the name of the virtual machine where all Erlang code is executed. Every compiled Erlang file has the suffix .beam. The virtual machine is sometimes referred to as the emulator.

ERTS is the Erlang Runtime System where the BEAM, kernel and standard libraries amongst others are included.

More information can be found at [erlang.org] 1.

Building from a git clone is quite simple:

./otp_build autoconf
./configure --enable-slave-emulator --enable-hipe
make -j4

You will get the erl binary in bin/erl. Start it up, and you will see [slave:0] in the ERTS system version line. This means that you are not using the Epiphany. Only one process may use it at a time. To do so, use:

env SLAVE_BINARY=bin/epiphany-unknown-elf/slave.smp bin/erl

It should now show [slave:16] instead. Use epiphany:spawn/1 to run an Erlang process on the Epiphany.

There are some tests included. These can be run on the release build (that we compiled above) with the following command:

make -j4 -C tests fast

%CopyrightBegin%

Copyright Ericsson AB 2010-2014. All Rights Reserved.

The contents of this file are subject to the Erlang Public License, Version 1.1, (the "License"); you may not use this file except in compliance with the License. You should have received a copy of the Erlang Public License along with this software. If not, it can be retrieved online at http://www.erlang.org/.

Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License.

%CopyrightEnd%