Add the experimental/meta-x32 layer to your local Build Directory. You can find the experimental/meta-x32 source repository at http://git.yoctoproject.org.

Edit your conf/bblayers.conf file so that it includes the meta-x32. Here is an example:

     BBLAYERS ?= " \
        /home/nitin/prj/poky.git/meta \
        /home/nitin/prj/poky.git/meta-yocto \
        /home/nitin/prj/poky.git/meta-yocto-bsp \
        /home/nitin/prj/meta-x32.git \
     "
                    

Enable the x32 psABI tuning file for x86_64 machines by editing the conf/local.conf like this:

      MACHINE = "qemux86-64"
      DEFAULTTUNE = "x86-64-x32"
      baselib = "${@d.getVar('BASE_LIB_tune-' + (d.getVar('DEFAULTTUNE', True) \
         or 'INVALID'), True) or 'lib'}"
      #MACHINE = "atom-pc"
      #DEFAULTTUNE = "core2-64-x32"
                    

As usual, use BitBake to build an image that supports the x32 psABI. Here is an example:

     $ bitake core-image-sato
                    

As usual, run your image using QEMU:

     $ runqemu qemux86-64 core-image-sato