I need a very small ARM based development board capable of running Linux (and Android, if possible, via SD card). The board should be not more than 25mm in terms of breadth. I found Raspberry Pi Model A to be perfect but it's not available. Any alternatives?
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After measuring a Raspberry Pi and looking at claimed dimensions I conclude that your 25mm measurement refers to the "height" or thickness.
A Raspberry Pi model B is slightly less than 25mm thick between extreme projections.
The model A may be slightly less, and you can easily reduce Model B height by 2.3mm by fitting a single USB socket or hard wiring to an external socket.
Raspberry Pi Model B is available On ebay now for from $105 buy now.
The Olunuxino ARM board is close to Raspberry Pi and can be had on ebay for $63 buy now
Raspberry Pi dimensions:
You don't state the other dimensions which are critical.
Your 25mm breadth (= width) does not make sense as a RP is
~ 85 mm x 56 mm (PCB) or
Model B is just under 25mm thick or tall from SD socket on one side to top of dual USB connector on the other.
Check out Carambola: http://www.8devices.com/product/3/carambola
It's 35x45mm, running OpenWRT. Plus it has WiFi onboard.
They're also developing the same board, but way much smaller. Like 25x35mm or something... It was announced on forum.