Messages in this thread |  | | | Date | Fri, 26 Aug 2011 10:48:38 +0400 | | From | Cyrill Gorcunov <> | | Subject | Re: [PATCH 1/2] x86, ioapic: Reserve only 128 bytes for IOAPICs |
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On Thu, Aug 25, 2011 at 06:41:57PM -0700, H. Peter Anvin wrote: > On 08/25/2011 05:17 PM, Bjorn Helgaas wrote: > > > > If the OS allocated the next 128 bytes to another device, it sounds > > like it would cause a conflict on Intel boxes. This must be an area > > that differs between vendors. I haven't seen a spec that mentions 256 > > bytes as the required minimum MMIO size for IOAPICs, and apparently > > the AMD IOAPIC decodes 240 bytes or fewer. > > > > For what it's worth, it's probably a bad idea on x86 for the OS to > allocate addresses in the 0xFExxxxxx range... > > -hpa >
I rather wonder if there a way to assign a different address for the watchdog Bjorn referring to. I don't have such machine to test but seems its base address is configurable via pmio. Just curious.
Cyrill
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