Hi,
I'm trying to run Fiasco.OC amd64 build on an Opteron 6100 magny-cours series (4-way-SMP, 12-cores-per-chip).  When it boots it is as if the scheduling interrupt on the local APIC is not getting set up correctly.  It also warns about some errata.  It does boot with MP disabled, and RTC for the scheduling - not much use on a 48-core machine though ;-)

Any clues??? Thanks,
Daniel

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Per_cpu_data_alloc: (orig: 0xfffffffff0080840-0xfffffffff0081498)              
Allocate 3160 bytes (3KB) for CPU[43] local storage (offset=fc887c0)           
OSVW_MSR1 = 0x000000000000000c                                                 
#Errata known 4, affected by at least one                                      
Allocate cpu_mem @ 0xffffffffffd0b000                                          
Local APIC[19]: version=10 max_lvt=5                                           
APIC ESR value before/after enabling: 00000000/00000000                        
Using the Local APIC timer on vector 90 (Periodic Mode) for scheduling         
CPU[43:25]: AuthenticAMD (10:9:1:0)[00100f91] Model: Unknown CPU at 2200 MHz   
                                                                               
  32/512 Entry I TLB (4K pages)     16 Entry I TLB (4M pages)                  
  48/512 Entry D TLB (4K pages)     48/128 Entry D TLB (4M pages)              
  64 KB L1 I Cache (2-way associative, 64 bytes per line)                      
  64 KB L1 D Cache (2-way associative, 64 bytes per line)                      
 512 KB L2 U Cache (8-way associative, 64 bytes per line)                      
10240 KB L3 U Cache (13-way associative, 64 bytes per line)                    
                                                                               
CPU[43]: goes to idle loop