[Arm-netbook] rk3399 what full schematics does lkcl want?

[Luke Kenneth Casson Leighton]

> 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.