 To undertake such a design reference design is needed. Without reference
 design it is virtually impossible or so time consuming that it makes no
 sense to even start. Luke pointed out some of most difficult parts that
 include memory design but also all other high speed parts (hdmi, usb etc..)
 then power section position i.e. position of capacitors, positions of power
 supply ic, then how to route ever increasing number of lines and so on. Even
 with well documented producers like TI or Freescale with all documentation
 and all reference cad designs it is hard.

 yyep.  usually i now just take a reference design and, as best i can,
change as little as possible.  on the RK3388 PCB i had to rotate the
entire Power Management block - ICs, wires, power planes - by 90
degrees, to shoe-horn it into the available space.  it worked.  saved
a *massive* amount of time, not having to redesign a power layout that
is known to work.

 and you know what? it worked!  the power section worked perfectly,
first time.  ok, so i shorted out some of the inductors and blew up
$200 worth of components, on one of the boards, but hey, omelettes and
eggs... :)

l.

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