[Bug 207419] Add ACPI support for RTC/CMOS device

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207419

--- Comment #4 from Jung-uk Kim <jkim at FreeBSD.org> ---
(In reply to Anthony Jenkins from comment #3)
> If you look closely at the OP's proposed ACPICA patch, the
> AcpiOs(Read|Write)Cmos() handlers are no-ops (Read returns 0, Write does
> nothing).

Actually, those are stubs for userland tools, i.e., acpiexec.  FYI, OSPM must
provide AcpiOsReadCmos() and AcpiOsWriteCmos().  See
sys/dev/acpica/Osd/OsdMemory.c, for example.

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