The issue at hand is going to be BIOS. The 5xx chipset was designed and released for 3xxx CPU. Any motherboard that has been laying around on a shelf, or if the manufacturer even still makes and updates BIOS for new sales, then you may well need to update that before it will work on the 5600G.
One of the easy ways that motherboard manufacturers have gotten around this glaring issue to is offer a system where you can update (flash) the BIOS without a CPU/RAM connected.
I didn't look into the model suggested above, but happened to look at the Tomahawk from the 550 line and it will not work without BIOS update. In truth, and as much respect as I have for what AMD did with AM4, this is a quagmire and solutions that are more sure to work readily are available from Intel in this regard. If you happen to have a 3xxx CPU laying around it wouldn't matter....