Most accelerometers can be configured to fire an interrupt when a programmed threshold is met. You'd have to hook it up to spi or i2c bus for configuration, then patch the interrupt output around to the l/r pads.
1) Pretty much yes, if the app itself isn't assuming too much about the environment
2) Not really. Only minor hassle is setting up and using a cross-compiler rather than the standard host compiler.
I havn't fully thought this through yet, but adding some basic dependency management would be interesting. If a program needed say allegro as packaged by Joe, it could specify depends="joe.com/allegro" .
Libraries would also have their own pxml file stating what they provide, and a list of...
It doesn't matter as the kernel and gcc provide different paths of floating point emulation, as well as the option to use neon etc.
All of the stuff that runs on the GP2X was not ported to fixed point :)
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