Openwrt on Rockchip RK3066 device or starting in chroot on android

I have Android TV box - DNS T-818 (CX-818, xtouch XTV01, stb902b): Rockchip RK 3066 2х1.6, Mali 400, RAM 1024 Mb, ROM 8Gb. I not found rk3066 support for openwrt. I saw another Linux builds (PicUntu, Lubuntu, Linaro, OpenSUSE, Fedora and another), but I can't understand - can I build custom owrt for this device if kernel source code for this SoC opened (but too old) and how do it? Or can I run owrt for armv7 build in chroot from installed android and make from don't needed TVbox router\nas\server?