[Arm-netbook] update to EOMA68 specification [was Re: 5" LCD resolution 800x480 working for EOMA but color problems may exist because of miswire]

[joem]

:this is not a miswire.  the specification has now changed to reflect
:what cannot now be changed.


>> 5" LCD resolution 800x480 working for EOMA.
>> Details here
>> http://www.gplsquared.com/eoma_boot/eoma_boot.html#eoma_with_5inch_lcd
>> These displays are about $16 from Aliexpress:
>> http://www.aliexpress.com/item/5inch-5-TFT-LCD-LCM-RGB-800-480-Display-TOUCH/474988848.html
>>
>> I still notice a problem with color - Red and Blue appear to be swapped.
>
>  ok.  the specification's going to have to change.  we cannot modify
> the CPU Card, so the spec has to be changed to match the card.  what a
> pain.


Hmmmppp...... The is another outstanding issue that needs resolving
before the next batch goes into production - this time to do with the RS232 RX line.
When connected, the entire board is able to power up through the RX line.
The cubieboard1,2 and iteaduino plus and EOMA-A20 boards all have same defect
because I assume all of them were designed and tested by the same engineering
team from Wits with no peer review input onto the process.

If you are doing another batch, make sure the CPU board RX line doesn't
power up the entire board through that line. They need to put a serial resistor in series
or a FET pair to sufficiently isolate the RX line. The same note applies to anyone else
using designs that originated with Allwinner/Wits.