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
[email protected]:/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.
Thanks,
Volker
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