Panic in ata_attach on sparc64

With sources over the past few months (since May, up to BETA5), I get
the following panic at boot time on this sparc64 (SunBlade-100):

ata0 at port 0x3f6,0x1f0-0x1f7 irq 14 on isa0
panic: isa_route_intr_res: start out of isa range
at line 168 in file /a/portbuild/sparc64/src-client/sys/sparc64/isa/isa.c
cpuid = 0;
Debugger("panic")
Stopped at      Debugger+0x1c:  ta              %xcc, 1
db> tr
__panic() at __panic+0x170
isa_route_intr_res() at isa_route_intr_res+0x80
isa_alloc_resource() at isa_alloc_resource+0x2b8
bus_alloc_resource() at bus_alloc_resource+0x68
ata_attach() at ata_attach+0x3c
device_probe_and_attach() at device_probe_and_attach+0xcc
isa_probe_children() at isa_probe_children+0x1e0
configure() at configure+0x38
mi_startup() at mi_startup+0xe4
btext() at btext+0x34

Kris