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Date: Fri, 26 Aug 2011 10:48:38 +0400 From: Cyrill Gorcunov <gorcunov@...il.com> To: "H. Peter Anvin" <hpa@...or.com> Cc: Bjorn Helgaas <bhelgaas@...gle.com>, Suresh Siddha <suresh.b.siddha@...el.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Ralf Jung <ralfjung-e@....de>, Yinghai Lu <yinghai@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 1/2] x86, ioapic: Reserve only 128 bytes for IOAPICs 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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