So the comment in there saying that in some cases BAR0-3 could contain junk is a
bogus? In other words, can we assume that one will always read 0x1f0 from BAR0
and 0x170 from BAR2 in compatibility mode. If so, the check is even simpler:

	if (pci_resource_start(p, 0) == 0x1f0)
		*primary = 1;
	if (pci_resource_start(p, 2) == 0x170)
		*secondary = 1;

In theory, but for the sake of about 30 bytes of code in an obscure 'last
resort work everywhere' driver it seemed a bit pointless.

Alan