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Back in the early days of the original ATI Radeon driver we had a similar/same problem. Joshua fixed it so I'm not sure exactly what he had to do, but he did find a way to tell the Radeon to allow ROM access. But I think that was Radeon specific, so we had to know that's what we were talking to and the right thing to do for this chip. Search your datasheets for your chips for what bit in what register to twiddle to open this up. I don't know if our solution survives reset or if it must be releated every possible boot. I won't have time for a few weeks, but will try to find a copy of sourcecode from back then and try to find this bit in there to report back.
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