However, if I’m not mistaken, a Freebsd image is available for the R2.
I thought that too till this thread: BPI-R2 FreeBSD support/ZRouter.org support
No,openwrt is a system (afaik busybox/buildroot based) with linux kernel for router-boards
Maybe ray uploaded his current work,but hardware support was not much like linux
No, FreeBSD has own kernel. Even more Debian did version of their distro with FreeBSD kernel.
No, OpenWRT is linux based. There is set of projects for FreeBSD based routers: pfSense, freebsd-wifi-build, ZRouter.org.
Unfortunately there is nothing to test yet. Work I done for R2’s FreeBSD support is not compatible with FreeBSD HEAD and I have to do big work on conversation with other guys in project to find best way that will satisfy all of us before commit R2 support. But I’m very low on free time yet. 