Booting of 200811 snapshot on Sun Fire V880

[Beat Gätzi]

Hi,

I'm trying to boot the 8.0-CURRENT-200811-sparc64-disc1.iso on a Sun 
Fire V880 but it failed:

Copyright (c) 1992-2008 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
         The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 8.0-CURRENT-200811 #0: Sun Nov  2 08:50:52 UTC 2008
     root at drazen.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC
WARNING: WITNESS option enabled, expect reduced performance.
real memory  = 8589934592 (8192 MB)
avail memory = 8377745408 (7989 MB)
cpu0: Sun Microsystems UltraSparc-III Processor (750.00 MHz CPU)
cpu1: Sun Microsystems UltraSparc-III Processor (750.00 MHz CPU)
cpu2: Sun Microsystems UltraSparc-III Processor (750.00 MHz CPU)
cpu3: Sun Microsystems UltraSparc-III Processor (750.00 MHz CPU)
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
registered firmware set <isp_1000>
registered firmware set <isp_1040>
registered firmware set <isp_1040_it>
registered firmware set <isp_1080>
registered firmware set <isp_1080_it>
registered firmware set <isp_12160>
registered firmware set <isp_12160_it>
registered firmware set <isp_2100>
registered firmware set <isp_2200>
registered firmware set <isp_2300>
registered firmware set <isp_2322>
registered firmware set <isp_2400>
kdb0 at kdbmux0
panic: trap: fast data access mmu miss
cpuid = 0
KDB: enter: panic
[thread pid 0 tid 100000 ]
Stopped at     kdb_enter+0x80: ta                %xcc, 1
db> bt
Tracing pid 0 tid 100000 td 0xc082f530
panic() at panic+0x20c
trap() at trap+0x570
-- fast data access mmu miss tar=0 %o7=0xc0123530 --
dcons_init_port() at dcons_init_port+0x7c
dcons_drv_init() at dcons_drv_init+0x144
dcons_modevent() at dcons_modevent+0x20
module_register_init() at module_register_init+0xdc
mi_startup() at mi_startup+0x18c
btext() at btext+0x30
db>

POST/diagnostic boot don't show any errors hence I think this is not a 
hardware error. I already tried a reset-all on OBP, to power-cycle the 
machine and updating OBP to the latest version (4.22.34) but it still 
fails. Any hints?

Thanks,
Beat