[Arm-netbook] motherboard negotiation

[Anthony Sheetz]

On Jan 13, 2012, at 3:53 PM, lkcl luke wrote:

> On Fri, Jan 13, 2012 at 8:42 PM, jonsmirl at gmail.com <jonsmirl at gmail.com> wrote:
> 
>> There is no good solution to the LCD problem, they are simply way too
>> many variations. I suspect that you'll end up with at most two or
>> three different LCDs interfaced to the EOMA board.
> 
> nope - no can do: inflexibility is failure.  failure is not an
> option.  this project has to cope with 320x240 all the way up to
> 1900x1200.

Darn, there goes my dream of having something that can drive my 2560x1600 display that'll also fit in my pocket.

> 
> we'll start _off_ small, just to make it manageable (2 or 3 different
> LCDs), but not dealing with this isn't an option.
> 
> 
>> You also have to deal with the fact that different CPU LCD controllers
>> have different capabilities. You may make a baseboard for an LCD that
>> a future CPU does not have the ability to control.
> 
> that would surprise me greatly.  *thinks*.... actually it wouldn't,
> no you're right (forgot about a couple of cases)  i know for example
> that the S5PV210 and S5PC110 can only cope with 1024x768 - if you try
> to push them to 1388x768 (like hardkernel.com did) then not only do
> you lose 2 pixels at either edge (because the internal memory buffer
> is only 1mb) but the quality is pretty dreadful, too.
> 
> under these circumstances we just have to say "Tough: Uncertified Combination".
> 
> 
>> Plus what about touch?  4-wire, 5-wire, capacitive, etc...
> 
> outside of scope of EOMA: i.e. not our problem [*1].  external I2C or
> USB chipsets on motherboard, or even running entirely in software on
> an STM32F or other embedded R/T CPU.
> 
> l.
> 
> [*1] except in the case of expansion headers such as putting the
> 4-wire TS controller of the A10 onto expansion-1, and even then it's
> _still_ not our problem because it's outside of the scope of EOMA.
> 
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