Problem in finding hard disks

[Lorenzo Campo]

I passed the problem, obviously <nfsroot>/etc/hosts was completely wrong (don't know why), 
anyway I corrected it and installation proceeded. Now I've another problem with disks. It says 
that can't find any hard disk:

Disk probe:
Disk found:

Can't find /dev/sda

I've a possible cause for this: I have SATA disks on any node, so maybe it's loading the wrong 
kernel (2.4 and not 2.6). I specified in fai.conf to load 2.6 image, but maybe there was a 
problem somewhere, so: where is the kernel image that FAI uses at the boot?
If this is not the problem, there is some issue about not-detected hard-disks by FAI?
Thank you very much for your help!
Lorenzo