於 五，2013-12-20 於 22:45 +0100，Rafael J. Wysocki 提到： > On Friday, December 20, 2013 01:10:26 PM H. Peter Anvin wrote: > > On 12/19/2013 09:38 PM, joeyli wrote: > > > > > > If don't use EFI time, then the first priority is using ACPI TAD if it > > > present. Due to ACPI TAD is a generic acpi device that's need OS parsing > > > DSDT table before set system time. > > > > > > Either move DSDT parser from subsystem initial stage to start_kernel or > > > move timekeeping initial to after DSDT be parsed. Which one you think is > > > more possible and risk less? Then I will try that way. > > > > > > > I discussed the DSDT/SSDT parsing issue with Rafael and he claims it > > would require a lot of restructuring. Unfortunately ACPI is at this > > point done rather late, as I understand. All of this is a big problem. > > My understanding, however, is that to use the TAD, we don't actually need to > create a struct acpi_device for it. We just need a handle to the ACPICA > object which can be found using acpi_get_devices() as soon as the namespace > has been extracted from the DSDT and friends. That in turn happens in > acpi_early_init(), which is called from start_kernel() right before > efi_late_init(). > > Is that early enough? > > Rafael > Thanks for your good suggestion, then I have a direction on using ACPI TAD earlier. Joey Lee -- 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
