Re: booting SMP P6 kernel on P4 hangs.

From: Mikael Pettersson (
Date: Tue Jul 31 2001 - 05:45:44 EST

On Tue, 31 Jul 2001 07:10:34 +0100 (BST), Tigran Aivazian wrote:

>Isn't SMP P6 kernel supposed to boot fine on a P4? Btw, booting with
>"nosmp" works but booting with "noapic" hangs just the same.
>Here is where it hangs:
>> CPU0: Intel(R) Pentium(R) 4 CPU 1300 Mhz stepping 0a
>> per-CPU timeslice cutoff: 731.49 usecs
>> weird, boot CPU (#0) not listed by the BIOS
>> Getting VERSION: f000acde
>> Getting VERSION: f0ffac21
>> leaving PIC mode, enabling symmetric IO mode.
>> enabled ExtINT on CPU#0
>> ESR value before enabling vector: 00000000
>> ESR value after enabling vector: 00000000
>> CPU present map: 1
>> Before bogomips.
>> Error: only one processor found.
>> Boot done.
>> Synchronizing Arb IDs.
>> ..TIMER: vector=31 pin1=2 pin2=0
>> activating NMI Watchdog...done
>> CPU#0 NMI appears to be stuck
>> testing the IO APIC.............
>> ..........................done
>> calibrating APIC timer...
>> .....CPU clock speed is 1285.2614 Mhz
>> bus clock speed is 0.0000 Mhz
>> cpu:0, clocks:0, slice:0

Which kernel version?
I actually wouldn't expect the current local APIC or SMP code to
work perfectly on a P4, since there are many differences to P6/K7.
I scribbled some of them down a while ago (based on reading
the first rev of Intel's IA32 Vol3 for P4 manual):
- FEE000090 Arbitration Priority not supported in P4
- broadcast is 0xFF in P4
- flat cluster model is not supported in P4
- focus processor concept doesn't exist in P4
- "all excluding self" destination shorthand == "all including self"
  in P4 if lowest-priority delivery mode is used (not recommended)
- SPIV bit 9 (focus) should be 0 on P4
- version is 0x14 and maxlvt is 5 on P4

2.4.7 apic.c enables the SPIV focus bit, maybe that's the problem.

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This archive was generated by hypermail 2b29 : Tue Jul 31 2001 - 21:00:50 EST