grab the prebuilt x86 ext4.img from their barrier breaker release dir, mount it on a computer, change the /etc/inittab to spawn a getty on ttymfd4. copy over the firmware and kernel modules from the edison and boot it. no wifi tools in that image so that's about all that you can do with it. And I suspect that uboot is enabling the watchdog, and this image isn't disabling it.
Been trying to get a working openwrt image built by hand, but no luck as yet. The kernel version matching the edison release doesn't build on openwrt, and I usually end up doing the patching by hand, but the intel patch is around 100k lines, so it's not worth my time.