[gta02-core] Board parameters update

[Álvaro Lopes]

Rene Harder wrote:
>> Hmm, I'm not sure we'll be able to pull this off with through vias.
>> Also, don't they increase the EMI risk by spreading signals all over
>> the place ?
>>
>>   
> 
> Actually neither do I and It probably will get really messy around the
> BGAs ;-)
> Well, yeah they'll make a swiss cheese out of our image planes, which
> results in an increase of their impedance.

I just took a look at some echocanceller board with FBGA. All vias are PTH. Many lay unconnected on bottom side of FBGA.

Álvaro