Old the onboard pci driver is still seems to be needed as a dummy driver. On RS690 based system like dbm690t and pistachio, linux kernel is halted on scan PCI bus below 00:14:04 node.
I think this is a symptom of a broken RS690 driver, although it may be related to another problem. The right way to fix it is to figure out why it's needed, since it shouldn't be. I think the most likely thing is that the RS690 driver is trying to initialize the graphics device, and shouldn't.
If you need to add onboard for RS690 to work, lets add it in the RS690 directory. It's not something that we want to resurrect.
Thanks, Myles