On my motherboard I also have to use the downstream patch otherwise the sata controller gets lumped with the Ethernet controllers. Could be something else for your specific situation, but maybe it’s something common which should be in the wiki...
I ran into this today after updating. Found this thread about ROM-Bar and had high hopes, but it didn't work.
After typing up a plea for help in this thread, but before hitting post I thought maybe I should just double check everything so people...