The PlayStation 2 emulation is not working yet. The focus is not on making an emulator for running games, as there are other emulators for that, but rather on making it possible to run NetBSD/playstation2. This page contains preliminary instructions for how to experiment with NetBSD.
NOTE: This doesn't work, and the playstation2 port of NetBSD is not active at the time of writing this.
It was removed from NetBSD's tree in 2009, although a blog post from 2014 indicates that it could possibly be brought back to life.
To attempt to run the latest snapshot (from 2002):
dd if=/dev/zero of=nbsd_playstation2.img bs=1024 count=1 seek=3900000
gxemul -X -E playstation2 -d nbsd_playstation2.img netbsd-GENERIC.gz
Then it hangs, waiting for keyboard input from a keyboard which doesn't exist, in order to select the root device.
As a horrible hack, which probably doesn't really work, one could imagine setting root_device and rootdev manually. For example:
<setroot> ffffffff8002ad98: 27bdff20 addiu sp,sp,-224 BREAKPOINT: pc = 0xffffffff8002ad98 (The instruction has not yet executed.) GXemul> put w root_device, 0xffffffffc0016800 <-- the a1 value from wdattach GXemul> put w rootdev, 0x100 <-- ??? GXemul> pc=ra <-- to return from setroot without GXemul> co keyboard interaction
But there are timeouts and lost interrupts, so even if a correct disk image was used, and the correct rootdev value was used, it is unlikely that it would work yet.