RE: x86-64 with nvidia MCP51 chipset: kernel does not find HPET

["Langsdorf, Mark" <mark.langsdorf@amd.com>]

 > > If the hardware is not providing the HPET description in ACPI,
> > there's little you can do, and most vendors do not provide
> > the HPET description.
> > 
> > Do you know if there's an entry for HPET in the ACPI?
> 
> I'm not exactly an ACPI expert, but I do not think there is 
> an entry for HPET in the ACPI, as the check in
> arch/x86_64/kernel/io_apic.c fails:
>
> But, with some help from anonymous sources, I have been able 
> to find the HPET and make it work using a userspace driver
> that pokes registers by mmap'ing /dev/mem.  So we just need
> a way to tell the kernel it's there.
> Presumably this would require a PCI quirk.
> 
> Is this likely to be worth the trouble?

It's not a general purpose solution, but if you can write
up the quirk, Andi might be willing to white list the 
machine in question.

-Mark Langsdorf
AMD, Inc.


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