As there seems to have been a bunch of attempts to fix the T9 boxes, the two solutions I've seen in this thread have either targetted the linux mainline or just been hacked up decompiled dtbs. So what I've tried to do is create a patch against the rockchip-linux fork of the kernel, and modifies one of the existing dts files so it's not full of magic numbers that should be symbols. From the dtb this built, I've copied it onto one of these tvboxes, and the sdmmc port works. From there I've been able to install to emmc. As I just wanted this headless, none of the fancy hardware has been tested.