Re: solder points available?
> ...what address, data, control, and gpio lines are accessablevia soldering?
There are no address/data/control lines that are available to solder
to using *regular* soldering techniques.
Also we don't have a good idea which gpio lines are needed for the
normal functioning of the device. I've repurposed a few of them for
Take a look at the photos, or take your Zipit unit apart. Soldering
on this sucker is very difficult.
If you need access to certain signals, you can probably find them -
but it is painful.
Depending on your soldering skills, you can tap into points on the
I categorize them as 'very easy', 'easy', 'hard', 'very hard'
There are only two 'very easy' solder pads: for ground and DBG
(ground it for special boot mode).
If you are lucky, the signal comes out on one side of a surface
mount component like a resistor or transistor (I call that 'easy',
assuming you can solder to such small things)
If you are less lucky, you must solder onto a trace or trace + via
If you are less lucky than that, you must solder onto a via alone
If you are out of luck, then the signal is not exposed
('impossible'). This is a multilayer board with BGA connections.
Some vias and connections occur under the chips.
What are you trying to do ?
I have the minimal needed for special boot mode and COM2 for a debug
terminal (2 'very easy', 2 'easy' and 1 'very hard')
After that minimal enabling, I wouldn't wish more micro-soldering on
- i'm currently doing some mmc hacking on another
device, and was curious what possibilities existed for
adding a mmc interface on the zipit, if i could get
access to either 4 gpios, or 2 data lines, and the OE
and WR lines i could fix up something. worst case, i
could use one of the uarts to do the job.
> What are you trying to do ?dave
> I have the minimal needed for special boot mode and
> COM2 for a debug
> terminal (2 'very easy', 2 'easy' and 1 'very hard')
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