only one logical CPU used in Xeon

[Robert Heron]

Hi,

I have FreeBSD 6.2R running on Intel SE7501HG2 motherboard with two  
Xeon installed.
System detects 2 CPUs with 2 cores in each of them (total 4 cores) but  
it uses only one core in each Xeon (total 2 of 4 cores are used only).
I see it in the 'top'. I tried the same hardware on FreeBSD 7.1R and  
this OS uses all of the detected cores.

What should I do FreeBSD 6.2R to use all of the available cores?
I cannot upgrade it to 7.x, must use 6.x

Regards,
Robert Heron