Xen devel - Aug 2008 - FW: ACPI HPET Timer - Works on standard Kernel - Broken on Xen Kernel

Sorry to have to send this to the dev list but no one in the user list
seems to know the answer and Google turned up nothing at all.

 

I have an error in my dmesg system log about hpet not correctly
enabling:

hpet_acpi_add: no address or irqs in _CRS

 

The same kernel without Xen enables it fine:

hpet0: at MMIO 0xfed00000 (virtual 0xffffffffff5fe000), IRQs 2, 8, 31

hpet0: 3 32-bit timers, 25000000 Hz

hpet_resources: 0xfed00000 is busy

 

Do I have to pass an additional boot option? (ACPI is already enabled)
or is there something wrong with my Xen Kernel build? Anyone have any
idea why the Xen kernel would break hpet support? (I''m using default
Centos 5.2 kernel and 3.2.1 stable)

 

Thanks,

 

Rob


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Xen takes the HPET for itself, so it¹s not available to dom0 kernel (nor is
it emulated).

 -- Keir

On 28/8/08 08:28, "Robert Dunkley" <Robert@saq.co.uk> wrote:
> Sorry to have to send this to the dev list but no one in the user list
seems
> to know the answer and Google turned up nothing at all.
>  
> I have an error in my dmesg system log about hpet not correctly enabling:
> hpet_acpi_add: no address or irqs in _CRS
>  
> The same kernel without Xen enables it fine:
> hpet0: at MMIO 0xfed00000 (virtual 0xffffffffff5fe000), IRQs 2, 8, 31
> hpet0: 3 32-bit timers, 25000000 Hz
> hpet_resources: 0xfed00000 is busy
>  
> Do I have to pass an additional boot option? (ACPI is already enabled) or
is
> there something wrong with my Xen Kernel build? Anyone have any idea why
the
> Xen kernel would break hpet support? (I¹m using default Centos 5.2 kernel
and
> 3.2.1 stable)
>  
> Thanks,
>  
> Rob
>  
> The SAQ Group
> Registered Office: 18 Chapel Street, Petersfield, Hampshire GU32 3DZ
> SEMTEC Limited Trading as SAQ is Registered in England & Wales
> Company Number: 06481952
>  
> http://www.saqnet.co.uk <http://www.saqnet.co.uk/>  AS29219
> SAQ Group Delivers high quality, honestly priced communication and I.T.
> services to UK Business.
> DSL : Domains : Email : Hosting : CoLo : Servers : Racks : Transit :
Backups :
> Managed Networks : Remote Support.
>  
> Find us in http://www.thebestof.co.uk/petersfield
>  
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel



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