It occurred to me that Rick Kelly wrote in gmane.os.netbsd.ports.x86-64:
> Neither Solaris or NetBSD recognizes most of the nforce4 hardware. 

Which hardware isn't being recognized? My board is fully supported, as far as
I'm aware.

> There isn't any audio 

auich0 at pci0 dev 4 function 0: nForce4 AC-97 Audio
auich0: interrupting at ioapic0 pin 11 (irq 11)
auich0: ac97: Avance Logic ALC850 codec; no 3D stereo
auich0: ac97: ext id 9c6<AC97_23,LDAC,SDAC,CDAC,SPDIF,DRA>
audio0 at auich0: full duplex, independent

> or network drivers 

nfe0 at pci0 dev 10 function 0: ioapic0 pin 5 (irq 5), address 00:15:f2:4d:39:d8
makphy0 at nfe0 phy 1: Marvell 88E1111 Gigabit PHY, rev. 2
makphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FD
X, auto

Granted, the NForce ethernet was committed only a few weeks ago in -current,
but the audio bit has been there for ages.

>>Anyone got any ideas on what else I might try?
>
> Shut off ACPI.

cpi0 at mainbus0: Advanced Configuration and Power Interface
acpi0: using Intel ACPI CA subsystem version 20060217
acpi0: X/RSDT: OemId <Nvidia,AWRDACPI,42302e31>, AslId <AWRD,00000000>
acpi0: SCI interrupting at int 9
acpi0: fixed-feature power button present

wfm.