Because blank screen issue can't be fixed by me I decided to build also imx6 images based on Linux kernel 3.14 from solidrun. It has some drawbacks but the most important part (video playing) should work.
Images can be downloaded from here: Index of /imx6-solidrun-kernel-3.14/
Current version is LibreELEC-imx6.arm-7.90.007-sr-3.14.img.gz