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ACPI: Add support to parse 2nd MADT

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When a BIOS bug presents multiple APIC/MADTs,
Linux currently uses the 1st and ignores the 2nd.

But some machines work better if we use the 2nd.

http://bugzilla.kernel.org/show_bug.cgi?id=7465

Add a warning and boot parameter "acpi_apic_instance=2"
to allow parsing the 2nd.

No change to default behaviour in this patch.

Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Len Brown 2007-03-11 03:26:14 -04:00
commit a1fdcc0d27
2 changed files with 58 additions and 5 deletions
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6
Documentation/kernel-parameters.txt
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@ -138,6 +138,12 @@ and is between 256 and 4096 characters. It is defined in the file
See also Documentation/pm.txt, pci=noacpi
acpi_apic_instance= [ACPI, IOAPIC]
Format: <int>
2: use 2nd APIC table, if available
1,0: use 1st APIC table
default: 0
acpi_sleep= [HW,ACPI] Sleep options
Format: { s3_bios, s3_mode }
See Documentation/power/video.txt