x86: Fix boot on Twinhead H12Y (80b3e557) · Commits · 戴 / test

Despite lots of investigation into why this is needed we don't know or have an elegant cure. The only answer found on this laptop is to mark a problem region as used so that Linux doesn't put anything there. Currently all the users add reserve= command lines and anyone not knowing this needs to find the magic page that documents it. Automate it instead. Signed-off-by:

Alan Cox <alan@linux.intel.com> Tested-and-bugfixed-by:

Arne Fitzenreiter <arne@fitzenreiter.de> Resolves-bug: https://bugzilla.kernel.org/show_bug.cgi?id=10231 Link: http://lkml.kernel.org/r/20120515174347.5109.94551.stgit@bluebook Signed-off-by:

Ingo Molnar <mingo@kernel.org>

arch/x86/pci/fixup.c

+17 −0

Original line number	Diff line number	Diff line
		@@ -519,3 +519,20 @@ static void sb600_disable_hpet_bar(struct pci_dev *dev)
		}
		}
		DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ATI, 0x4385, sb600_disable_hpet_bar);

		/*
		* Twinhead H12Y needs us to block out a region otherwise we map devices
		* there and any access kills the box.
		*
		* See: https://bugzilla.kernel.org/show_bug.cgi?id=10231
		*
		* Match off the LPC and svid/sdid (older kernels lose the bridge subvendor)
		*/
		static void __devinit twinhead_reserve_killing_zone(struct pci_dev *dev)
		{
		if (dev->subsystem_vendor == 0x14FF && dev->subsystem_device == 0xA003) {
		pr_info("Reserving memory on Twinhead H12Y\n");
		request_mem_region(0xFFB00000, 0x100000, "twinhead");
		}
		}
		DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x27B9, twinhead_reserve_killing_zone);

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