[yocto] More up to date network boot (PXE?) reference

[Ronald Oakes]

My target will need to be loaded over the network - maintaining only a
ram file system.  So, I've been reading up on doing network booting
using PXE or gPXE.  However, the best reference (or the one I'm most
likely to trust) is coming from the Yocto Project Wiki.  Except it is
5.5 years out of date (September 2010).

So, can anyone recommend a more recent reference to consult in trying
to make sure I've got my build (etc.) set up correctly?

Ron Oakes