hi about u-boot and "1.5G problem" take a look here https://gist.github.com/iuncuim and in particular this patch for u-boot https://gist.github.com/iuncuim/3d2b20f7274aa8ea69a634bc7aeb54a2   I guess that will fix the problems surrounding 1.5G boards, possibly that the memory isn't correctly detected. But with the patch, it should 'just work'. But i'm not sure if that may have some unintended 'side effects'   I think iuncuim https://github.com/iun