I resubmitted the patch for this device because a lot of people asked for it. But it looks like the development of OpenWRT is stalled for some time - so I'll leave the firmware binaries here until it has been integrated.
There's an image with and one without LuCI in case you need more space for additional packages.
This is the current trunk (Designated Driver) from 04-04-2016. It's not completely tested so your device might catch fire.
WR802N image with LuCI:
https://github.com/RickP/OpenWRT-for-WR802N/raw/master/openwrt-ar71xx-generic-tl-wr802n-squashfs-factory.bin
WR802N image without LuCI:
https://github.com/RickP/OpenWRT-for-WR802N/raw/master/openwrt-ar71xx-generic-tl-wr802n-squashfs-factory-no_luci.bin
