Android works pretty well on the Nook ST I'm using. Seems pretty 'open' to me. I can run a plethora of apps.
Also custom builds of Android are available, so the source must be available. Android seems pretty open to me.
Also it's designed for mobile apps, which is good for e-readers.
What's the point re-inventing the wheel? Android does the job well and has a ton of apps available. The source is available. What's the problem? I don't see any practical advantage running Linux over Android on a portable device.
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