Re: [PATCH 0/7] more HPET fixes and enhancements

[Clemens Ladisch]

Randy.Dunlap wrote:

> On Tue, 18 Oct 2005, Clemens Ladisch wrote:
>
> > Randy.Dunlap wrote:
> > > hpet_poll, HPET_IE_ON failed: (5) Input/output error
> >
> > This probably means that the interrupt isn't free.
>
> Isn't free because it is already in use as a system timer
> interrupt, for example?

If it tries to use interrupt 0, yes.

> Does this test work (succeed) for you?  If so, is HPET being
> used as replacement for legacy timer and RTC?  (as it is where I
> am testing)

Yes.  Yes.


However, I've patched my kernel to initialize the HPET manually
because my BIOS doesn't bother to do it at all.  A quick Google search
shows that in most cases where the BIOS _does_ bother, the third timer
(which is the only free one after system timer and RTC have grabbed
theirs) didn't get initialized and is still set to interrupt 0 (which
isn't actually supported by most HPET hardware).

This means that hpet.c must initialize the interrupt routing register
in this case.  I'll write a patch for this.


Regards,
Clemens

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