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blog/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"