ac100 team mailing list archive

[Gilles Grandou <gilles@xxxxxxxxxxx>]

Le 17/08/2011 14:35, Gordan Bobic a écrit :
> On Wed, 17 Aug 2011 14:25:38 +0200, Marc Dietich <marvin24@xxxxxx> wrote:
> > Hi Gordan,
> >
> > > Has anyone got the model/part numbers for the Micron chips used in the
> > > AC100? Or the spec of the chips? I'm trying to find some larger capacity
> > > chips that will be pin compatible.
> >
> > I forgot the extact number (must have been something like
> > MT42L64M32D1KL-3 IT)
> > but you will find out when you open it ;-)
> >
> > Note: there is a special code on the chips which you need to
> > translate to the
> > partnumber (http://www.micron.com/support/fbga.html).
> >
> > But I wonder how you will solder a bga...
>
> Thanks Marc. I was hoping it wasn't BGA, but these guys have re-chipped
> non-DIY things for me before:
> http://www.retronix.com/
>
> It'll probably cost a non-trivial fraction of a new AC100 (they are
> cheap even by netbook standards nowdays), but it'll be worth it if it
> leads to an ARM laptop with oodles of RAM. :)
>
> I just have to figure out what chips are going to be compatible (need to
> find a Micron product list) and then find out what DIMMs have them on
> (I'm crossing my fingers that crucial.com support guys may be able to
> tell me that).

My model is equiped with hynix chips, zoom on this picture: 
https://picasaweb.google.com/lh/photo/hQ22i6s8WS0NirVCix-qrw?feat=directlink

If you change chips you might have to upate register configurations in 
arch/arm/mach-tegra/board-paz00-memory.c

However, I'm wondering how the bootstrap code would support new unknown 
RAM chips if they are not strictly compatible (I think RAM chips are 
described in the BCT partition, but its format is still unknown)

Good luck!
Gilles.