There's more...

You can also obtain a graphical representation of the data using the pybootchartgui.py tool included in the Poky source. From your project's build folder, you can execute the following command to obtain a bootchart.png graphic in /tmp:

$ cd /optyocto/fsl-community-bsp/wandboard/
$ /opt/yocto/fsl-community-bsp/sources/poky/scripts/pybootchartgui/pybootchartgui.py 
   tmp/buildstats/ -o /tmp 

An example graphic is shown next: