>
> on 19/10/2010 07:56 Andriy Gapon said the following:
>> on 19/10/2010 01:31
volker@vwsoft.com said the following:
>>> Hi Andriy& list!
>>>
>>> Since rev 213323 my Sony Vaio P11Z was unable to boot up. It broke with a divide
>>> by zero in topo_probe_0x4 at line 289 as cpu_logical is 0.
>>>
>>> The cpu is an Intel Atom Z520 (single core). System doesn't boot at all w/ acpi
>>> enabled.
>>>
>>> The following patch made me to boot up again.
>>>
>>> Index: i386/i386/mp_machdep.c
>>> ===================================================================
>>> --- i386/i386/mp_machdep.c (revision 213936)
>>> +++ i386/i386/mp_machdep.c (working copy)
>>> @@ -286,7 +286,7 @@
>>> cpu_logical++;
>>> }
>>>
>>> - cpu_cores /= cpu_logical;
>>> + cpu_cores /= cpu_logical==0?1:cpu_logical;
>>> hyperthreading_cpus = cpu_logical;
>>> }
>>>
>>> ``mptable -grope -verbose`` gives:
>>> ===============================================================================
>>>
>>> MPTable
>>>
>>> looking for EBDA pointer @ 0x040e, found, searching EBDA @ 0x0009fc00
>>> searching CMOS 'top of mem' @ 0x0009f800 (638K)
>>> searching default 'top of mem' @ 0x0009fc00 (639K)
>>> searching BIOS @ 0x000f0000
>>> searching extended BIOS @ 0x000e0000
>>> groping memory @ 0x00080000
>>> groping memory @ 0x00090000
>>>
>>> MP FPS NOT found,
>>> suggest trying -grope option!!!
>>>
>>> so it's not of much help.
>>>
>>> relevant part of dmesg looks like:
>>>
>>> FreeBSD 9.0-CURRENT #3 r213904:213936M: Sat Oct 16 22:50:53 UTC 2010
>>> root@juno.sz.vwsoft.com:/usr/obj/usr/src/sys/JUNO i386
>>> CPU: Intel(R) Atom(TM) CPU Z520 @ 1.33GHz (1333.31-MHz 686-class CPU)
>>> Origin = "GenuineIntel" Id = 0x106c2 Family = 6 Model = 1c Stepping = 2
>>>
>>> Features=0xbfe9fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>>>
>>>
>>> Features2=0x40c3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,xTPR,PDCM,MOVBE>
>>> AMD Features=0x100000<NX>
>>> AMD Features2=0x1<LAHF>
>>> TSC: P-state invariant
>>> real memory = 2147483648 (2048 MB)
>>> avail memory = 2081042432 (1984 MB)
>>>
>>> I'm wondering if there's a better way to fix that problem or if someone wants to
>>> commit my fix.
>>
>> Definitely not - it violates style(9).
>> Kidding, of course :-)
>>
>> Could you please download and run the following script and send back output?
>>
http://people.freebsd.org/~jkim/cpu_topology-12212009.sh
>> Thank you very much!
>
>
