Getting ready

Poky uses the OpenEmbedded build system, and as such, uses the BitBake tool, a task scheduler written in Python which forked from Gentoo's Portage tool. You can think of BitBake as the make utility in Yocto. It will parse the configuration and recipe metadata, schedule a task list, and run through it.

BitBake is also the command-line interface to Yocto.

Poky and BitBake are two of the open source projects used by Yocto. The Poky project is maintained by the Yocto community. You can download Poky from its Git repository at http://git.yoctoproject.org/cgit/cgit.cgi/poky/.

Development discussions can be followed and contributed to by visiting the development mailing list at https://lists.yoctoproject.org/listinfo/poky.

BitBake, on the other hand, is maintained by both the Yocto and OpenEmbedded communities, as the tool is used by both. BitBake can be downloaded from its Git repository at http://git.openembedded.org/bitbake/.

Development discussions can be followed and contributed to by visiting the development mailing list at http://lists.openembedded.org/mailman/listinfo/bitbake-devel.

The Poky build system only supports virtualized QEMU machines for the following architectures:

Apart from these, it also supports some reference hardware Board Support Packages (BSPs), representative of the architectures just listed. These are those BSPs:

To develop on different hardware, you will need to complement Poky with hardware-specific Yocto layers. This will be covered later on.

How to do it...

The Poky project incorporates a stable BitBake release, so to get started with Yocto, we only need to install Poky in our Linux host system.

The current Yocto release is 1.7.1, or Dizzy, so we will install that into our host system. We will use the /opt/yocto folder as the installation path:

$ sudo install -o $(id -u) -g $(id -g) -d /opt/yocto
$ cd /opt/yocto
$ git clone --branch dizzy git://git.yoctoproject.org/poky

How it works...

The previous instructions will use Git (the source code management system command-line tool) to clone the Poky repository, which includes BitBake, into a new poky directory on our current path, and point it to the Dizzy stable branch.

There's more...

Poky contains three metadata directories, meta, meta-yocto, and meta-yocto-bsp, as well as a template metadata layer, meta-skeleton, that can be used as a base for new layers. Poky's three metadata directories are explained here:

See also