Getting started with RTEMS on 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, 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
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
- First obtain the RTEMS code from github.
$ cd $ mkdir -p development/rtems/repo $ cd development/rtems/repo $ git clone firstname.lastname@example.org: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.