[Bug 207677] atrtc Warning: Couldn't map I/O on Skylake Supermicro X11SSH-LN4F

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207677

Poul-Henning Kamp <phk@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |phk@FreeBSD.org

--- Comment #9 from Poul-Henning Kamp <phk@FreeBSD.org> ---
pstef@ ping'ed me on this one.

I have nothing much to add over the comment I put in atrtc_attach() in the
original commit (294643529963), but which has subsequently been lost:

       /*
        * Not that we need them or anything, but grab our resources
        * so they show up, correctly attributed, in the big picture.
        */

I wanted to make the RTC resources show up in the accounting, for instance
devinfo -rv

For what it is worth, I get the warning also on my laptop (T480):

    atrtc0: <AT realtime clock> port 0x70-0x77 irq 8 on acpi0
    atrtc0: Warning: Couldn't map I/O.
    atrtc0: registered as a time-of-day clock, resolution 1.000000s

I suspect the reason for the message is that acpi0 already claimed some of
those ports:

  acpi0
      Interrupt request lines:
          0x9
      I/O ports:
          […]
          0x70
          0x72-0x77
          […]

I guess, if somebody want to fix this, the ATRTC needs to be picked up through
ACPI rather than PNP ?

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