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I want to do the same thing you did, because I've also got an eGalax touch screen. For the input I've got the choice beween DVI and VGA, no HDMI (may I ask you which touch screen you are using BTW?)
I want to use it with my home automation system. The ideal would be that I could use it with Android, because my home automation manufacturer provides an Android app. If not I can also use regular Linux, because it works in any browser windows as well. But regular Linux is not optimized for touch, as you can probably imagine.
I tried this with a Raspberry Pi, but it was too slow (and no Android). I then bought an Odroid U3, which was plenty fast, but has a hard time providing picture on anything but true HDMI. Only one of the 3 HDMI to DVI converters I used worked, and even then, only with Linux. It did not work with Android.
So I then returned the Odroid, and now how got 3 options left in my opinion: a Banana Pi (with VGA adapter), a CubieTruck or a dedicated Atom PC miniITX board. These are in order of cost.
The first thing I'll try now is the Banana Pi. I'm guessing I'll have to go through the same thing you did (maybe not recompiling, I've found drivers here, but I'm not sure if that'll work and especially not with Android. It does intimidate me though, because, even though I know my way around computers very well, I don't have much Linux experience, and this is especially so for command line and in-depth stuff. (doesn't mean I don't want to learn though!)