Since i should have been mistaken about the protocol it uses, i had marked it disqualified because it could never be imported as a UCI engine.
Thanks to the user comments coming to blog, i recently woke up and tried again using XB protocol. And voila! It works perfectly on Exynos and Rockchip with 900+1 time control.
Minimardi is written by Juan Pablo Fernandez and the Android port will probably be very useful as a trustable build around 1500 ELO. I've already included it in Rapidroid.
Download and enjoy an engine you can beat yourself as human, very rare these days: HERE
Another version of Minimardi packed with a GUI is also available HERE on Google Play. However, the engine included seems to be v1.1, an earlier version. I never tried that one, so i don't know about it but in case it's a Java port and not a native code, it should perform much weaker than the XB engine.