OpenWrt with TVheadend Question

Hello dear forum.
I'm new here and would like to post a color. Don't know if it's in the right place here.
I would like to operate a router (e.g. Asus RT-n56u) with tvheadend and a TT connect S2 3600. I've found a lot on the net but I can't get any further. I would like to compile the image myself but I can't find the packages I need. I read in a German forum that there is a "Kernel DVB Support". But I can't find it. If there is a feed or something on git please tip. A howto would be most beautiful. I want to play around with it a bit more. E.g. on other routers or as an x86 image in VirtualBox.
Thank you very much.