I just port volumio to a RK3188 based TV stick, name MK802IV.
While working on a old kernel version 3.0.36, there is no overlayfs an squashfs support. The whole file system is install in internal nand flash.
Here is the code :
and here is the working image :
after download the image, download rk3188.tar.xz file from :
extract the files inside rk3188.tar.xz , there are tools to download the image into the TV stick.
on linux use the upgrade_tool :
sudo ./upgrade_tool uf image_path
on windows use the RKBathTool