[gentoo-amd64] multicore strange issue

[Beso]

hi,

i've got a strange problem with my new notebook pc. i've bought a pc with an
amd athlon 64 x2 processor with 2 cores, an atheros board and an rs690 ati.
my old pc was a turion 64 with an atheros board and an rs480. now the
components inside are all about the same so i've just copied the old gentoo
system into the new pc and tried to recompile the kernel to have it tuned
for the new processor. so the thing i've done was to activate the symetric
multiprocessing and set to compiled into the kernel of md4, md5, md6 and aes
x86_64 chipers for a luks /home chipering.
the problem is that with the old normal config the kernel detects one
processor and one core and it works, loading the modules, but when enabling
simetric multiprocessing the kernel detects just one processor and one core
and then it fails to load modules because of a different executable format
in the modules.

the strange thing is that opensuse livecd and mandriva live cd recognize the
double processor (/proc/cpuinfo has 2 lines) and is able to step it in the
right way. does anyone has a hint on what to control in the kernel config to
see what's wrong?!

thanks.

-- 
dott. ing. beso