XServe Node running a debian with only one processor

[grave]

Got the xserve booting
(thanks to http://ozlabs.org/ppc64-patches/patch.pl?id=59)

But I can only run a single CPU kernel, does somebody know how to get  
the second CPU on ?

The kernel is a ppc64 one with smp compiled in but only able to boot  
with nosmp option
kernel from kernel.org + patch to setup.c and pmac_features.c)

Thanks in advance for any hint...

xavier