blogng/posts/2013-05-28-getting-started-with-rtems-on-archlinux.markdown
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---
layout: post
title: "Getting started with RTEMS on Archlinux"
date: 2013-05-28 21:24
comments: true
categories:
- RTEMS
- GSoC
- Archlinux
---
The default RTEMS geting started does not cover the toolchain setup as it should be. It either redirects the user to download a ~1 GB distro or some pretty old RPMs. This shouldn't be like this.
There is an excellent tool called ***rtems source builder*** which can help a newbie setup RTEMS environment in a brisk. This post is the authors journal about how he did it, shared beacuse it might be beneficial to people looking to bootstrap RTEMS.
RTEMS is a real time operating system. It works on various type of hardware, and a devlopment setup is specific to the hardware of developers choice. Here I will demonstrate setting up a sparc toolchain with b-sis simulator.
### Setting up toolchain
First step of our RTEMS journey. A toolchain consists of a compiler, linker, debuggger and a simulator for the hardware. We need these tools to compile the RTEMS code and execute our programs.
This was a painful step in past. Cross compiler environments are nasty to get right. But dont worry, we have our wonderful rtems-source-builder to rescue.
rtems-source-builder automates the task of setting up this toolchain - it downloads the source files, builds them and installs in the system. It also have the option to make a tarball.
The actuall steps are documented here - [rtems-source-builder documentation][1], but if you prefer a capsule
- Setup directories and get source
```
$ cd
$ mkdir -p development/rtems/src
$ cd development/rtems/src
$ git clone git://git.rtems.org/rtems-source-builder.git
$ cd rtems-source-builder
```
- Check environment.
```
$ ./source-builder/sb-check
RTEMS Source Builder environment is ok
```
- Build a sparc target
```
$ cd rtems
$ ../source-builder/sb-set-builder --log=l-sparc.txt /
--prefix=$HOME/development/rtems/4.11 4.11/rtems-sparc
```
this will produce binaries in `$HOME/development/rtems/4.11` directory.
__Note__: Default version of makeinfo in archlinux is incomaptible with tools we build, source-builder documentations says
>Archlinux, by default installs texinfo-5 which is incompatible for building GCC 4.7 tree. You will have to obtain texinfo-legacy from AUR and provide a manual override.
```
# pacman -R texinfo
$ yaourt -S texinfo-legacy
# ln -s /usr/bin/makeinfo-4.13a /usr/bin/makeinfo
```
### Building RTEMS
- First obtain the RTEMS code from github.
```
$ cd
$ mkdir -p development/rtems/repo
$ cd development/rtems/repo
$ git clone git@github.com:RTEMS/rtems.git
$ cd rtems
```
- Bootstrap the rtems and build code.
```
$ export PATH=/home/dhananjay/build/rtems/4.11/bin:$PATH
$ ./bootstrap
```
- Build a b-sis simulator code.
```
$ cd ..
$ mkdir b-sis && cd b-sis
$ ../rtems/configure --target=sparc-rtems4.11 --enable-rtemsbsp=sis --enable-tests=samples --enable-posix --prefix=/home/dhananjay/build/rtems/src/
$ make
```
### Running example code.
- Find the sample applications and execute them.
```
$ cd sparc-rtems4.11/c/sis/testsuites/samples/hello
$ ls
hello.exe hello.num hello.ralf init.o Makefile
$ sparc-rtems4.11-run hello.exe
*** GSOC HELLO WORLD TEST ***
Hello RTEMS World
Dhananjay Balan
*** END OF HELLO WORLD TEST ***
```
*Update*: Newer versions of RSB builds RTEMS automatically, no manual intervention needed. You can skip this step altogether.
[1]: http://www.rtems.org/ftp/pub/rtems/people/chrisj/source-builder/source-builder.html "rtems-source-builder documentation"