Re: WARNING: MP table in the EBDA can be UNSAFE

[Zwane Mwaikambo]

On Fri, 5 Dec 2003, Paul Rolland wrote:

> Our Linux, running on an IBM X-Series 445, says :
> (excerpt from dmesg) :
>
> found SMP MP-table at 0009dd40
> hm, page 0009d000 reserved twice.
> hm, page 0009e000 reserved twice.
> hm, page 0009e000 reserved twice.
> hm, page 0009f000 reserved twice.
> WARNING: MP table in the EBDA can be UNSAFE, contact linux-smp@xxxxxxxxxxxxxxx if you experience SMP problems!

This bit is ok and can be safely ignored.

> LAPIC (acpi_id[0x0000] id[0x0] enabled[1])
> CPU 0 (0x0000) enabledProcessor #0 Pentium 4(tm) XEON(tm) APIC version 16
>
> LAPIC (acpi_id[0x0001] id[0x12] enabled[1])
> CPU 1 (0x1200) enabled<4>Processor #18 INVALID - (Max ID: 16).
> LAPIC (acpi_id[0x0002] id[0x20] enabled[1])
> CPU 1 (0x2000) enabled<4>Processor #32 INVALID - (Max ID: 16).
> LAPIC (acpi_id[0x0003] id[0x32] enabled[1])
> CPU 1 (0x3200) enabled<4>Processor #50 INVALID - (Max ID: 16).
>
> Is there any known solution to re-enable the CPU 1, CPU 2 and CPU 3 ?
>
> Is this an IBM bug ?

Did you compile your kernel with the following option?
IBM x440 Summit/EXA support

CONFIG_X86_SUMMIT
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