I retried building an older version and encountered a somewhat
different problem (entire boot log is attached):
xrtc0 at iic0 addr 0x6f: Xicor X1226 Real-time Clock/NVRAM
ixp425_intr_establish(irq=22, ipl=5, func=c0410070, arg=c1134008)
ixp425_intr_establish(irq=29, ipl=5, func=c040fff8, arg=c1134008)
ixp425_intr_establish(irq=28, ipl=5, func=c04103fc, arg=c1130790)
ixp425_intr_establish(irq=27, ipl=5, func=c0410354, arg=c1130790)
ixp425_intr_establish(irq=26, ipl=5, func=c04102ac, arg=c1130790)
ixp425_intr_establish(irq=5, ipl=6, func=c04101d8, arg=00000000)
uhub0 at usb1: vendor 0x1033 OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1 at usb2: vendor 0x1033 EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub2 at usb0: vendor 0x1033 OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
cprng sysctl: WARNING insufficient entropy at creation.
boot device: <unknown>
root on npe0
nfs_boot: trying DHCP/BOOTP
nfs_boot: DHCP next-server: 192.168.77.250
nfs_boot: my_name=kinder
nfs_boot: my_domain=eddyp.homeunix.net
nfs_boot: my_addr=192.168.77.251
nfs_boot: my_mask=255.255.255.0
nfs_boot: gateway=192.168.77.1
root on 192.168.77.250:/export/netbsd-nslu2/root
root time: 0x54f77695
init: copying out path `/sbin/init' 11
Process (pid 1) got sig 11
Process (pid 1) got sig 11
Process (pid 1) got sig 11
Process (pid 1) got sig 11
Process (pid 1) got sig 11
[...]