The reality is that with the time pressures to get Firefox OS running and working on the devices intended to be released there has been very little resource to

The reality is that with the time pressures to get Firefox OS running and working on the devices intended to be released there has been very little resource to supported other hardware. At some point this may change but it's really up to those interested in that hardware putting the effort in from the looks of things. Mozilla can't provide an image to flash due to licensing restrictions on binary blobs for the hardware (graphics drivers, video decoders, etc).