on 19/10/2010 01:31 volker@vwsoft.com said the following:
quoted text
> 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!
-- 
Andriy Gapon
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