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OpenPOWER Firmware Build Environment

The OpenPOWER firmware build process uses Buildroot to create a toolchain and build the various components of the PNOR firmware, including Hostboot, Skiboot, OCC, Petitboot etc.


See the doc/ directory for documentation source. Contributions are VERY welcome!


Issues, Milestones, pull requests and code hosting is on GitHub:

See for howto contribute code.

Building an image

To build an image for a Blackbird system:

git clone --recursive
cd op-build
./op-build blackbird_defconfig && ./op-build

There are also default configurations for other platforms in openpower/configs/. Current POWER9 platforms include Witherspoon, Boston (p9dsu), Romulus, and Zaius.

Buildroot/op-build supports both native and cross-compilation - it will automatically download and build an appropriate toolchain as part of the build process, so you don't need to worry about setting up a cross-compiler. Cross-compiling from a x86-64 host is officially supported.

The machine your building on will need Python 2.7, GCC 8.4 (or later), and a handful of other packages (see below).

Dependencies for 64-bit Ubuntu/Debian systems

  1. Install Ubuntu 22.04 or Debian 12 (x86_64 or ppc64le).

  2. Enable Universe (Ubuntu only):

     sudo apt-get install software-properties-common
     sudo add-apt-repository universe
  3. Install the packages necessary for the build:

     sudo apt-get install cscope universal-ctags libz-dev libexpat-dev \
       python2 python-is-python3 language-pack-en texinfo gawk cpio xxd \
       build-essential g++ git bison flex unzip \
       libssl-dev libxml-simple-perl libxml-sax-perl libxml-parser-perl libxml2-dev libxml2-utils xsltproc \
       wget bc rsync

Dependencies for 64-bit Fedora systems

  1. Install Fedora 33 (x86_64 or ppc64le).

  2. Install the packages necessary for the build:

     sudo dnf install gcc-c++ flex bison git ctags cscope expat-devel patch \
       zlib-devel zlib-static texinfo "perl(bigint)" "perl(XML::Simple)" \
       "perl(YAML)" "perl(XML::SAX)" "perl(Fatal)" "perl(Thread::Queue)" \
       "perl(Env)" "perl(XML::LibXML)" "perl(Digest::SHA1)" "perl(ExtUtils::MakeMaker)" \
       "perl(FindBin)" "perl(English)" "perl(Time::localtime)" "perl(open)" \
       libxml2-devel which wget unzip tar cpio python bzip2 bc findutils ncurses-devel \
       openssl-devel make libxslt vim-common lzo-devel python2 rsync hostname