It occurred to me that murray@river-styx.org wrote in gmane.os.netbsd.ports.x86-64:
> Hi all,
>     I have a nForce4 motherboard on amd64 and I can tell you that my
> experience is that the IDE controller works fine. However, my SATA II
> is not operational.

Hm, not having any SATA disks, I disabled these controllers in the BIOS
setup, but before doing so they *did* get probed by viaide(4).

(This is on an Asus A8N-E)