Hi Wolfgang,
On Tue, Apr 13, 2010 at 12:40:39PM +0000, Wolfgang Spraul wrote:
I will try to support the MTK fact and phone finding
effort a bit.
thanks a lot for your feedback and input.
Since I am currently in Shenzhen I walked down to the
street and bought
3 books with MTK schematics. The stuff is probably online already somewhere
but I will try to find phones that have matching model numbers to the
ones we have schematics for.
You can find the MTK reference schematics easily online - but not the
various actual products that Chinese manufacturers build based on them.
So those books are probably a really good idea.
Next steps for me: Scan the schematics stuff and put
it online. Find some
6223/6225 based phones that are cheap & suitable for hacking, i.e. ideally
with some nice test points or JTAG.
yes, JTAG would be incredibly cool. I really don't understand why the
study-bbs.com P1302 and P1300 are sold as development platform and then
don't provide JTAG access. The same company even sells ARM JTAG
adapters :/
Other common MTK chips are 6205, 6217, 6218, 6219,
6226, 6228.
Yes, I'm aware of them, they all seem to be more or less the same.. but
since we have seen leaked versions of the 6223 and 6225 SDK, we should
start with them to have a 'known good' setup.
One word of caution - the above lists, and
documentation we start digging
up, may give a false impression of predictability. In reality the brand
names and model numbers are a total mess in China. Typos everywhere. All
sorts of things are printed on cases & boxes, chips are changed without
anybody noticing or caring. There are endless smaller Chinese brands making
phones with 6223 or 6225 chips, but I think it will be very hard to use
them as a stable source, to get phones with the same chips over time. So
I think it's better to focus on the somewhat bigger Chinese brands as
listed above.
I completely agree.
Thanks again,
Harald
--
- Harald Welte <laforge(a)gnumonks.org>
http://laforge.gnumonks.org/
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