On Mon, Nov 30, 2009 at 01:52:03PM -0800, Yinghai Lu wrote: > if HW state that reg is only 32bit pref, > why should we care about the upper 32bit? pref_mem64 describes the resource, not the HW. All the PCI specs define Type 1 configuration space with Prefetchable Memory register as 64-bit. Even if the Type 1 (PCI Bridge) HW ignores this register. See "7.5.3. Type 1 Configuration Space Header" of PCI EXPRESS BASE SPECIFICATION, REV. 1.1. > looks like that your bridge device need quirk to clear that so called > upper 32bit for it. Hrm...I don't think this is a quirk. PCI spec defines 64-bit PrefMem window register regardless of what type of resource we program into it. hth, grant -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
