On 01/07/2014 02:40 AM, joeyli wrote: > > Due to accessing CMOS through ASL need enable SMM support in OVMF, Why? The CMOS is its own ASL address space, and you need that anyway to be able to access the RTC proper. If you don't want to use it because you don't want to export any indication of a legacy RTC you should be able to just do I/O port references directly in your ASL. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html