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kern/43702: hpet* at acpi? needs more work

>Number:         43702
>Category:       kern
>Synopsis:       hpet* at acpi? needs more work
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Aug 04 11:00:01 +0000 2010
>Originator:     Jukka Ruohonen
>Release:        5.0 - HEAD

Currently hpet(4) -- which, btw, also lacks a manual page -- attachs to
acpi0 based only the PNP/HID -information.  This however does not work on
some ACPI-based systems that expose the HPET information via a so-called
IA-PC High Precision Event Timer Table.


Code and DSDT exploration.


Make it optionally attach also via information from the HPET table.

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