On Tuesday 03 November 2015 10:10:21 Sinan Kaya wrote: > > I don't see anywhere in the SBSA spec addendum that the PCI > configuration space section that unaligned accesses *MUST* be supported. > > If this is required, please have this info added to the spec. I can work > with the designers for the next chip. > > Unaligned access on the current hardware returns incomplete values or > can cause bus faults. The behavior is undefined. Unaligned accesses are not allowed, but any PCI compliant device must support aligned 1, 2 or 4 byte accesses on its configuration space, though the byte-enable mechanism. In an ECAM host bridge, those are mapped to load/store accesses from the CPU with the respective width and natural alignment. Arnd -- 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
