[ManDay]

I'm looking for a small reader (preferably light, of course) with a long battery life (chargeable via USB, if possible) and, very important, completely open source software (preferably Linux, but Android would do, if there is no Linux device which matches the criteria).

Do any of you know of such a device?

I want to use it as a kind of trekking tablet to keep maps on (and other things), but without gimmicks like "Earl" (if that's ever released...)

Thank you.

PS: Given that I would like a small device, it would need an accordingly high resolution.

PS 2: By completely FOSS I do not include certain programs which may or may not ship with the reader, but the base system (kernel and drivers) must be completly open and preferably vanilla.