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