NetBSD 8.1 on PB 550c

Hello,

I installed NetBSD 8.1 (using the sysinst method) on a PowerBook 550c.
SCSI, ADB and SONIC Ethernet all appear to work. The installation was on
the internal disk using a 640 MB root partition and a 40 MB swap
partition.  I'm using a custom installation without X11 or man pages; I
haven't modified any of the startup scripts yet.  The system is booting
using the default GENERICSBC kernel.

The problem is that I'm getting a consistent kernel crash at every
shutdown; see example entries from /var/log/messages below -- the crash
appears to be related to an MMU issue:

Feb 10 06:14:16 Blackbird /netbsd: panic: MMU fault

The PB 550c should be roughly equivalent to a Centris 650, except
slightly faster.  I haven't tried installing on a Centris 650 yet.

On a side note, is anyone able to confirm that the traditional
installation method still doesn't work?  I think it stopped working in
NetBSD 7.  The issue was that the ffs filesystem created by Mkfs in
MacOS wasn't recognized by NetBSD (plus installation was limited to the
first 1 GB of a disk).

thanks for any suggestions

-Stan Johnson

-----
...
Feb 10 06:14:16 Blackbird syslogd[204]: restart
Feb 10 06:14:16 Blackbird /netbsd: 08CC28: 00000000 00000000 00000000
001B1064 001B1132 0082D8C0 0408CC94 00212182
Feb 10 06:14:16 Blackbird /netbsd: 08CC48: 0408CC74 00212320 007D21C8
0408CCD0 00000000 7FFFFFFF 0408CD24 0000308C
Feb 10 06:14:16 Blackbird /netbsd: 08CC68: 0408CC78 00000008 00000505
A929A92D 01FBEA50 00002200 00000B14 00002000
Feb 10 06:14:16 Blackbird /netbsd: 08CC88: 00002200 00B14005 001A402E
0408CD20 0036F740 A929A929 12800014 008A5DC8
Feb 10 06:14:16 Blackbird /netbsd: 08CCA8: 01FBEA50 001A41BE 0408CD24
FFFFB900 00000000 22080002 3C787008 0408CC9C
Feb 10 06:14:16 Blackbird /netbsd: 08CCC8: 05050005 00050005 A929A92D
0408CCE4 0408CD24 0408CCEC 001A13A0 0408CD24
Feb 10 06:14:16 Blackbird /netbsd: 08CCE8: 00023DD0 00000000 00000B14
0408CD20 00005000 12800018 00000000 00041000
Feb 10 06:14:16 Blackbird /netbsd: 08CD08: 00040000 0019C236 008A5DC8
00023B0A 008A4360 00A56B10 0000066E 0408CD5C
Feb 10 06:14:16 Blackbird /netbsd: 08CD28: 00023EEA 008A5DC8 00005000
12800014 00000000 00000000 FFFFD000 0003F000
Feb 10 06:14:16 Blackbird /netbsd: 08CD48: 00000000 0019C1F6 00023E1C
00928848 008A4390 0408CDA0 0019C3EE 008A5DC8
Feb 10 06:14:16 Blackbird /netbsd: 08CD68: 00002000 00041000 00956A4C
00000000 0002CAF0 00A8BDC4 008F0018 00045BCC
Feb 10 06:14:16 Blackbird /netbsd: 08CD88: 047021A8 008A4360 008A436C
0408CE0C 001CC5DC 00000000 0408CDCC 0019CC74
Feb 10 06:14:16 Blackbird /netbsd: 08CDA8: 008A4360 00001000 FFFFD000
0408CDC8 00000000 0000000F 008F0004 00A8BC20
Feb 10 06:14:16 Blackbird /netbsd: panic: MMU fault
Feb 10 06:14:16 Blackbird /netbsd: cpu0: Begin traceback...
Feb 10 06:14:16 Blackbird /netbsd: ?(?)
Feb 10 06:14:16 Blackbird /netbsd: db_panic(8,ffffff7f,0,1eac0c,408cbc8)
at 0
Feb 10 06:14:16 Blackbird /netbsd:
vpanic(2b1772,408cbd4,408cc60,21600,2b1772) + 15e
Feb 10 06:14:16 Blackbird /netbsd: panic(2b1772,b14,2000,2200,b14005) + c
Feb 10 06:14:16 Blackbird /netbsd: trap(408cc78,8,505,a929a92d) + 290
Feb 10 06:14:16 Blackbird /netbsd:
pmap_remove_mapping(8a5dc8,5000,12800014,0,0) + 16e
Feb 10 06:14:16 Blackbird /netbsd:
pmap_remove(8a5dc8,2000,41000,956a4c,0) + cc
Feb 10 06:14:16 Blackbird /netbsd:
uvm_unmap_remove(8a4360,1000,ffffd000,408cdc8,0) + 176
Feb 10 06:14:16 Blackbird /netbsd: uvmspace_free(?)
Feb 10 06:14:16 Blackbird /netbsd: uvm_proc_exit(8a4360) + 64
Feb 10 06:14:17 Blackbird /netbsd: exit1(a8bc20,0,f,f,0) + 244
Feb 10 06:14:17 Blackbird /netbsd: sigexit(a8bc20,f,2cb0a,2caf0,45bd8) + 206
Feb 10 06:14:17 Blackbird /netbsd: postsig(f) + 128
Feb 10 06:14:17 Blackbird /netbsd:
lwp_userret(a8bc20,3e,0,a8bc20,8f0004) + 5e
Feb 10 06:14:17 Blackbird /netbsd:
machine_userret(a8bc20,408cfb4,0,3e,1b3,a8bc20,408cfb4) + 34
Feb 10 06:14:17 Blackbird /netbsd: syscall(1b3) + 82
Feb 10 06:14:17 Blackbird /netbsd: trap0() + e
Feb 10 06:14:17 Blackbird /netbsd: cpu0: End traceback...
Feb 10 06:14:17 Blackbird /netbsd:
Feb 10 06:14:17 Blackbird /netbsd: dumping to dev 4,1 offset 8205
Feb 10 06:14:17 Blackbird /netbsd: dump 1 2 3 4 5 6 7 8 9 10 11 12 13 14
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 succeeded
Feb 10 06:14:17 Blackbird /netbsd: rebooting...