Yes Android kernel, with some patches.<p>These links might be useful:<p><a href="https:&#x2F;&#x2F;sturmflut.github.io&#x2F;ubuntu&#x2F;bq&#x2F;2015&#x2F;07&#x2F;02&#x2F;hacking-the-bq-part-4-building-and-booting-a-kernel&#x2F;" rel="nofollow">https:&#x2F;&#x2F;sturmflut.github.io&#x2F;ubuntu&#x2F;bq&#x2F;2015&#x2F;07&#x2F;02&#x2F;hacking-the...</a><p><a href="https:&#x2F;&#x2F;github.com&#x2F;bq&#x2F;aquaris-E4.5&#x2F;tree&#x2F;aquaris-E4.5-ubuntu-master" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;bq&#x2F;aquaris-E4.5&#x2F;tree&#x2F;aquaris-E4.5-ubuntu-...</a>