NetBSD boots on the IBM MCA RS/6000 model 7011-250

Hello.
Finally here is the result of booting file taken from message

To: port-prep%netbsd.org@localhost
Subject: Re: NetBSD ported to the IBM MCA RS/6000 model 7006
From: Karl Dietz <dekarl%web.de@localhost>
Date: Tue, 15 Jan 2008 01:14:03 +0100

The machine is 7011-250 with 32 mb of ram, no video card, two frame
relay cards (not connected to the network), runs AIX 4.3.3 fine

When netbooting I got the following

IPLCB ptr = 0x0x4fd0000
Machine model = 0x8010046
RAM = 0x20
p=0x80b680 start 0x800000 edata 0x808fb0 end 0x80b680 ladr 800000
Found magic at 0xde0, kernel is size 0x14a25c

>> NetBSD/rs6000 BOOT, Revision 1.1
>> ([email protected], Mon Dec 17 12:51:36 MST 2007)

Boot:
Loading in()
|2477848+204140 [158896+150412]=0x2da88c
start=0x100000

About to run
123

NetBSD/rs6000 booting ...

bi addr= 0x3e0ee8

i=0 ssize=70

bi addr= 0x3e0ee8

i=1 ssize=70

bi addr= 0x3e0ee8
i=2 ssize=70
bi addr= 0x3e0ee8
i=3 ssize=70
bi addr= 0x3e0ee8
i=4 ssize=70
found 5 bucs
BUC type: 2
BUC cfg incr: 0
BUC devid reg: ffffffff
BUC iocc?= 0
BUC location= 30303030
BUC type: 3
BUC cfg incr: 0
BUC devid reg: ffffffff
BUC iocc?= 0
BUC location= 30303030
BUC type: 3
BUC cfg incr: 0
BUC devid reg: ffffffff
BUC iocc?= 0
BUC location= 30303030
BUC type: 3
BUC cfg incr: 0
BUC devid reg: ffffffff
BUC iocc?= 0
BUC location= 30303030
BUC type: 3
BUC cfg incr: 0
BUC devid reg: ffffffff
BUC iocc?= 0
BUC location= 30303030
sysinfo scr_addr 0xff200000 -> f0

Loaded initial symtab at 0x38ec84, strtab at 0x3b5d00, # entries 9377
trap: pid 0.1 (system): kernel MCHK trap @ 0x266be0 (SRR1=0x1030)
panic: trap
Stopped in pid 0.1 (system) at  netbsd:cpu_Debugger+0x10:       lwz
 r0, r1, 0x14

db> show trace
0x003e0cc0: at panic+0x1b4
0x003e0d10: at trap+0x100
0x003e0da0: kernel MCHK trap by initmsgbuf+0x4c: srr1=0x1030
            r1=0x3e0e60 cr=0x2282f444 xer=0x20000000 ctr=0 mq=0
0x003e0e60: at _prop_dictionary_keysym32_pool+0xffc71470
0x003e0e80: at oea_startup+0x58
0x003e0ed0: at cpu_startup+0x1c
0x003e0ee0: at main+0x78
0x003e0f30: at 0x1000f0

db> show registers
r0          0x26cdd4    panic+0x1b8
r1          0x3e0cb0    _prop_dictionary_keysym32_pool+0x52124
r2          0x35aaa0    cpu_info
r3          0x35aaa0    cpu_info
r4          0xc0000030
r5          0
r6          0xd
r7          0x3e0c78    _prop_dictionary_keysym32_pool+0x520ec
r8          0x80
r9          0x360000    iplcrc+0x268
r10         0
r11         0x360000    iplcrc+0x268
r12         0x20001044
r13         0
r14         0x8f98
r15         0x3
r16         0x4fd1b74
r17         0x4fcfc00
r18         0x8ef5
r19         0x4fffe08
r20         0x8ef4
r21         0x4fd0338
r22         0x4fd0000
r23         0x8fc8
r24         0x2
r25         0x360000    iplcrc+0x268
r26         0x357e50    proc0
r27         0x3dd000    _prop_dictionary_keysym32_pool+0x4e474
r28         0x360000    iplcrc+0x268
r29         0x360000    iplcrc+0x268
r30         0x331274    null_vnodeop_entries+0xd0
r31         0x100
iar         0x2fe2b8    cpu_Debugger+0x10
msr         0x1030
lr          0x2fe2b8    cpu_Debugger+0x10
ctr         0x30b304    cnflush
cr          0x40001042
xer         0x20000000
mq          0
netbsd:cpu_Debugger+0x10:       lwz     r0, r1, 0x14
db> show callout
hardclock_ticks now: 0
    ticks  wheel       arg  func
2083603110 -49/-12760 93a10118  _prop_dictionary_keysym32_pool
trap: kernel read DSI trap @ 0x7c6802ae by 0x25a39c (DSISR 0x40000000,
err=14), lr 0x25a38c
panic: trap
Faulted in DDB; continuing...

db> show map

MAP 0x375338: [0xd0000000->0xf0000000]
        #ent=6, sz=51322880, ref=1, version=9, flags=0x1
        pmap=0x38df20(resident=30, wired=30)

db> reboot
The operating system has halted.
Please press any key to reboot.

rebooting...

How could I help at least fix the panic?

Actually I'm more interested in PPC601 code in the kernel than in MCA
part.  I have tried to boot NetBSD on Powermac 7200 and run into some
PPC601 related issues.
Yet I have 8 rs/6000 MCA machines that definitely deserve somethig to run