> /pci@80000000/@d/@2/@1:2,/netbsd: Device not configured

The separator comma like 
@0:5,ofwboot.xcf
is for what you tell to Open Firmware.

The boot file string is to be read then by ofwboot instead.
You have to use slash without comma.
So it should look like

/pci@80000000/@d/@2/@1:2/netbsd

But this not only the problem. It is saying not configured.
If I were you, I will watch the boot message while intaller
boots. Write down the device name listed for your NetBSD.

By the way, it also be nice to look at the disklabel from
the installer kernel (after booting from boot.fs).

What does it look like when you type
disklabel sd0
? 
---
(Makoto Fujiwara)
http://www.ki.nu/software/NetBSD/iBook2/
http://www.ki.nu/software/namazu/tutorial/