starting AMD second core

[arthur <arthur%ilvsun3.com@localhost>]

I installed the latest NetBSD 4 iso image on my dual core AMD system, and I
noticed that when running two processor intensive applications, that "top"
showed them both splitting the CPU time (and not each having 100% of a different
core).

dmesg shows the second core "not started" (output below).

I don't see anything in the motherboard manual that indicates anything needs (or
can) be done via the bios to enable the second core.  Can someone point me to
what I need to do to get both cores running?

thanks.

cpu0 at mainbus0: apid 0 (boot processor)
cpu0: AMD Athlon(tm) 64 X2 Dual Core Processor 5000+, 2600.03 MHz
cpu0: features: ffdbfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu0: features: ffdbfbff<PGE,MCA,CMOV,PAT,PSE36,MPC,NOX,MMXX,MMX>
cpu0: features: ffdbfbff<FXSR,SSE,SSE2,B27,HTT,LONG,3DNOW2,3DNOW>
cpu0: features2: 2001<SSE3>
cpu0: I-cache 64 KB 64B/line 2-way, D-cache 64 KB 64B/line 2-way
cpu0: L2 cache 512 KB 64B/line 16-way
cpu0: ITLB 32 4 KB entries fully associative, 8 4 MB entries fully associative
cpu0: DTLB 32 4 KB entries fully associative, 8 4 MB entries fully associative
cpu0: AMD Power Management features: 7f<STC,TM,TTP,VID,FID,TS>
cpu0: AMD PowerNow! Technology 2600 MHz
cpu0: available frequencies (Mhz): 1000 1800 2000 2200 2400 2600
cpu0: calibrating local timer
cpu0: apic clock running at 199 MHz
cpu0: 8 page colors
cpu1 at mainbus0: apid 1 (application processor)
cpu1: not started