[Gta04-owner] [Community] Status of OpenPhoenux project

Adrien Dorsaz adrien at adorsaz.ch
Tue Sep 4 14:31:55 CEST 2012


Many thanks for your work :) Thanks too for the community work on
GTA04A3/4 kernel and the softwares (QtMoko, Replicant, SHR,...) !

Adrien

On Tue, 2012-09-04 at 12:14 +0200, Dr. H. Nikolaus Schaller wrote:
> Hi all,
> good news below...
> 
> Am 28.08.2012 um 14:49 schrieb Dr. H. Nikolaus Schaller:
> 
> > Hi all,
> > after some time with rare news (holidays - not really for
> > me but some contributors) I have enough to say for
> > another status update.
> > 
> > 
> > 1) GTA04-Production
> > 
> > ...
> > 
> > So the only news I have is that they are now continuing to
> > work. But unfortunately no finalization date.
> 
> Well, still no finalization date yet, but I have received the first
> batch of boards produced with the new soldering stencil
> and production process.
> 
> Quality is very good - better than we have ever seen before!
> 
> So it is indeed the DM3730CBP chip that shows some
> warpage if heated to ~250 C during soldering. This squeezes
> some of the BGA balls so that they touch their neighbor and
> make short circuits. It appears that we now do understand this
> misbehavior completely and have found good  counter-measures...
> 
> So I will notify the group tour participants on our backlog list so that
> you can e.g. supply changes of address. Then, we can ship the next
> handful of boards within this week.
> 
> All other group tour boards are planned to be produced and shipped
> in the next weeks (needs more than 1 week, because producing,
> testing, flashing NAND, packing etc. also takes some time).
> 
> Looking back in the history of this project, this was not the first
> technical blocking point we finally did move away. The most
> important ones were (in sequence):
> 
> 1. choosing components that work together and we (small team) can really buy them
> 2. squeezing everything into the existing GTA01/02 case
> 3. being 100% successful in PCB layout for 8 layers and fulfilling *all* design rules
> 4. getting things into production (there are ~250 components)
> 5. and now finally raising production yield to a sane level
> 
> Each one was quite a big challenge and most of them were
> fun to solve. Except the last one, because we could not contribute
> very much to a solution (except doing some more X-Ray organized
> by this community! Thanks Alex!).
> 
> Here is a picture that shows how we feel now:
> 
> 
> -- hns
> 
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