Linux + u-boot port to MT6235

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Marcin Mielczarczyk marcin.mielczarczyk at
Wed Nov 3 18:22:58 UTC 2010

On Wed, Nov 3, 2010 at 6:41 PM, Wolfgang Spraul <wolfgang at> wrote:
> Marcin,
> I very much enjoyed reading your Sciphone G2 news and it motivated me
> to jump in and try to help :-)
> So it turns out a good friend of mine is Vice President of the company
> that made the Sciphone G2 - it's a small world after all.
> I wrote up what I found so far

I'm realy suprised :) I didn't expect taht it'll go that far.

> The G2 was discontinued about a year ago, but over 200,000 were made so
> we should be able to find some still.
> He donated the absolute last 2 phones we could find in his office to the
> OsmocomBB project, a normal black one as well as a prototype red one.
> He also donated another 9 boards to OsmocomBB, I took this picture

That's great news!

> They are reworked/fixed, but _should_ work (note that 3 are without Wi-Fi).
> Now my question:
> For those 9 boards, what are the most important missing pieces so they
> can become useful for the OsmocomBB project?
> I guess a charger/USB cable would be nice (it's not a standard plug).
> What else?
> LCM? Maybe not so important?
> How about antennas? speaker/buzzer?

For sure these 9 boards will be useful for this project.
Besides running osmocomBB we have to run Linux with drivers for MTK
peripherals: GPIO, SD/MMC, NAND, I2C, SPI, UART, PWM, USB, LCD, etc.
Most of these peripherals are available on mentioned boards so they'll
be useful for drivers development.
If it comes to USB cable, it's not that important because L12C
connectors (which are in Sciphone G2) are pretty cheap and available

So even without USB cables, LCD, antennas, speakers, etc. boards will
be useful for some people.

> If I just send these 9 boards to Harald the way they are on the picture,
> is that useful? Or should I try to find some more parts? I'm most concerned
> about the antenna, not sure whether this is easy to source/find.

I already answered above.

> Separately, I will try to take pictures of the individual PCB layers, using
> a V3.1 PCB. I should have them by the end of the week.
> I am also trying to get the schematics, maybe BOM or other helpful data,
> but I'm not so sure on those, maybe they cannot find them anymore even if
> they would like to give them to us. Don't hold your breadth on those.

Wow, but I'm not holding my breath yet :)
Schematics would be realy useful ...
You can also ask about technical documentation for BT chip MT6601.
I couldn't find datasheet and it'll be needed to make BT working.

> Bottom line: 2 full G2 + 9 PCBA donated to OsmocomBB, PCBA pictures
> uploaded, PCB layer pictures coming. Schematics maybe.

That's very good news!
I appreciate your help.


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