101 lines
3.4 KiB
Markdown
101 lines
3.4 KiB
Markdown
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---
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layout: post
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title: "Getting started with RTEMS on Archlinux"
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date: 2013-05-28 21:24
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comments: true
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categories:
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- RTEMS
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- GSoC
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- Archlinux
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---
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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.
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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.
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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.
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### Setting up toolchain
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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.
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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.
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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.
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The actuall steps are documented here - [rtems-source-builder documentation][1], but if you prefer a capsule
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- Setup directories and get source
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```
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$ cd
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$ mkdir -p development/rtems/src
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$ cd development/rtems/src
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$ git clone git://git.rtems.org/rtems-source-builder.git
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$ cd rtems-source-builder
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```
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- Check environment.
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```
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$ ./source-builder/sb-check
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RTEMS Source Builder environment is ok
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```
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- Build a sparc target
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```
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$ cd rtems
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$ ../source-builder/sb-set-builder --log=l-sparc.txt /
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--prefix=$HOME/development/rtems/4.11 4.11/rtems-sparc
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```
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this will produce binaries in `$HOME/development/rtems/4.11` directory.
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__Note__: Default version of makeinfo in archlinux is incomaptible with tools we build, source-builder documentations says
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>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.
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```
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# pacman -R texinfo
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$ yaourt -S texinfo-legacy
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# ln -s /usr/bin/makeinfo-4.13a /usr/bin/makeinfo
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```
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### Building RTEMS
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- First obtain the RTEMS code from github.
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```
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$ cd
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$ mkdir -p development/rtems/repo
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$ cd development/rtems/repo
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$ git clone git@github.com:RTEMS/rtems.git
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$ cd rtems
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```
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- Bootstrap the rtems and build code.
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```
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$ export PATH=/home/dhananjay/build/rtems/4.11/bin:$PATH
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$ ./bootstrap
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```
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- Build a b-sis simulator code.
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```
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$ cd ..
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$ mkdir b-sis && cd b-sis
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$ ../rtems/configure --target=sparc-rtems4.11 --enable-rtemsbsp=sis --enable-tests=samples --enable-posix --prefix=/home/dhananjay/build/rtems/src/
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$ make
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```
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### Running example code.
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- Find the sample applications and execute them.
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```
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$ cd sparc-rtems4.11/c/sis/testsuites/samples/hello
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$ ls
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hello.exe hello.num hello.ralf init.o Makefile
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$ sparc-rtems4.11-run hello.exe
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*** GSOC HELLO WORLD TEST ***
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Hello RTEMS World
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Dhananjay Balan
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*** END OF HELLO WORLD TEST ***
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```
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*Update*: Newer versions of RSB builds RTEMS automatically, no manual intervention needed. You can skip this step altogether.
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[1]: http://www.rtems.org/ftp/pub/rtems/people/chrisj/source-builder/source-builder.html "rtems-source-builder documentation"
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