[Gta04-owner] Gta04-owner Digest, Vol 74, Issue 14

joerg at azami.de joerg at azami.de
Thu Feb 23 12:22:25 CET 2017


Hi all.

About OMAP  unsolderable ?

I just wonder if it is possible to use a foil with micro gold pearls an
glue the chip only in stat soldering.

LG Joerg Mueller.


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> Today's Topics:
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>    1. GTA04A5: good news and bad news (H. Nikolaus Schaller)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 22 Feb 2017 15:49:53 +0100
> From: H. Nikolaus Schaller <hns at goldelico.com>
> To: List for communicating with real GTA04 owners
> 	<gta04-owner at goldelico.com>
> Cc: Tinkerphones Community <community at tinkerphones.org>
> Subject: [Gta04-owner] GTA04A5: good news and bad news
> Message-ID: <A7E55D81-57F9-449F-BD6F-74E599943B1C at goldelico.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi,
> let's start with the good news.
>
> 1. Yesterday GTA04A5 boards have been produced.
>
> 2. We have a Letux 4.10 kernel which is really good
> and can be used as the basis for future OS development,
> e.g. Replicant and QtMoko.
>
> 3. I managed to get a new GPS chip driver working, which
> has a better chance to go upstream.
>
> But now the bad news.
>
> -1.: Only 12 out of 36 (*) GTA04A5 boards we
> have produced, are booting to Linux. The others either have a
> short circuit under the OMAP (which is the general PoP soldering
> problem we already know since the first generations of the
> GTA04) or the OMAP shows no response or does not recognise the
> ?SD card for unknown reasons.
>
> Unfortunately this yield of ~33% is not enough to avoid a financial
> fiasco, because we now have to pay for each good board approx.
> three times as much as it was planned.
>
> Hence we aborted production and it will not be continued.
> It simply does not make sense to waste more money for getting
> so much bad boards.
>
> Instead we will try to repair some of the non-working boards
> with using the components already bought.
>
> Sadly, this also makes it really the last GTA04 batch which will
> ever be built (making these GTA04A5 boards rare collectibles).
> Unless someone spends us enough money to make more experiments
> with OMAP3 PoP soldering.
>
> This situation makes me assume a very high risk for the Neo900
> project, since it uses exactly the same CPU and RAM/NAND PoP
> chip as we have on the GTA04A5. And it was planned to use the
> same production company and line. This means if we can't
> get it soldered for the GTA04A5 by a company with >10
> years experience and >150 projects per year, it is unlikely
> that they will try again and be more successful for the
> Neo900. They already nick-name this chip combination
> "unsolderable chips". And it is also unlikely to find someone
> else who can do it better without making ex(p+t)ensive experiments.
> So the best for Neo900 would be to change the CPU/RAM chip.
> But AFAIK, one of the key ideas is to use Maemo/Fremantle
> which is closely tied to the OMAP3 architecture.
>
> What will be the next steps for the GTA04A5?
>
> 1. I will test the boards we have and make 3 bins:
> A) good (let's hope that the 12 do not have other bugs making them
> unuseable)
> B) needs to try some repair
> C) does not seem possible to repair
>
> 2. We will repair what can be done and then I know
> how many good units we really have got
>
> 3. I will try to get as many pre-orders fulfilled
> sorted by order date.
>
> 4. We hope that someone can help to fill the financial
> gap. Well, this does not necessarily mean a donation
> but if you know a project that is in need and can pay
> an engineering team like we have, please contact me.
>
> BR and sorry to have no better good news,
> Nikolaus
>
> (*) The attached photo shows the 36 boards plus 4 produced in the
> first runs end of last year
>
>
>
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