Open the Quick start guide to Yocto Project, located at: Quick start guide

Set up your Linux system with the right packages (instruction are provided for Ubuntu, Fedora, CentOS and openSUSE)

Download the latest stable release:

$ git clone -b pyro git://git.yoctoproject.org/poky.git

or

$ wget downloads.yoctoproject.org/releases/yocto/yocto-2.3.2/poky-pyro-17.0.2.tar.bz2

Source oe-init-build-env script, to create the build directory:

$ source poky/oe-init-build-env my_dir

Edit conf/local.conf and set MACHINE and any extra required variables

Build the OS image:

$ bitbake core-image-minimal

Boot the OS image of your chose

$ runqemu qemux86

If

MACHINE=qemux86