OpenWrt on a GigaCenter

I have a GigaCenter 844E-2 which my ISP provided. They are unlike any router I've seen, looking at its specs and firmware. Are Calix GigaCenters compatible with OpenWrt?

Your device doesn't seem to be supported.

Read here to see how can you help adding your device to the supported list.

Mind to share the specs (i.e. SoC, RAM, Flash, Wifi hardware, ...)?