>  but could you try this debug kernel?
> 
>  http://www.ceres.dti.ne.jp/~tsutsui/netbsd/cdhdtape-20070717.gz

Well, this one is interesting, but not yet usable:

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
mainbus0 (root)
cpu0 at mainbus0: ID 0 (primary), 21064-0
jensenio0 at mainbus0
pckbc0 at jensenio0 port 0x60
pms0 at pckbc0 (aux slot)
pckbc0: aux slot interrupting at vector 0x990
wsmouse0 at pms0 (mux ignored)
com0 at jensenio0 port 0x3f8: ns8250 or ns16450, no fifo
com0: console
com0: interrupting at vector 0x900
com1 at jensenio0 port 0x2f8: ns8250 or ns16450, no fifo
com1: interrupting at vector 0x920
lpt0 at jensenio0 port 0x3bc
lpt0: interrupting at eisa irq 1
mcclock0 at jensenio0 port 0x170: mc146818 or compatible
eisa0 at jensenio0
EISA config header at 0x1ac061000
EISA config at 0x1a0000000
EISA config stride: 512
SLOT 0: offset 0x18386800 eisaid DEC2400
SLOT 1: offset 0x18397000 eisaid ELS8041
SLOT 2: offset 0x183b4800 eisaid ADP0002
SLOT 3: offset 0x183c6400 eisaid CPQ6101
SLOT 8: offset 0x00000008 eisaid =DD=DD=DD=DD=DD=DD=DD
SLOT 9: offset 0x00009b63 eisaid =FF=FF=FF=FF=FF=FF=FF
SLOT 10: offset 0xffffffff eisaid =FF=FF=FF=FF=FF=FF=FF
SLOT 11: offset 0xffffffff eisaid =FF=FF=FF=FF=FF=FF=FF
SLOT 12: offset 0xffffffff eisaid =FF=FF=FF=FF=FF=FF=FF
SLOT 13: offset 0xffffffff eisaid =FF=FF=FF=FF=FF=FF=FF
SLOT 14: offset 0xffffffff eisaid =FF=FF=FF=FF=FF=FF=FF
SLOT 15: offset 0xffffffff eisaid =FF=FF=FF=FF=FF=FF=FF
Reading config bytes to cdata[0] at 0x1b8386800
Reading config bytes to cdata[1] at 0x1b8386a00
Reading config bytes to cdata[2] at 0x1b8386c00
Reading config bytes to cdata[3] at 0x1b8386e00
Reading config bytes to cdata[4] at 0x1b8387000
Reading config bytes to cdata[5] at 0x1b8387200
Reading config bytes to cdata[6] at 0x1b8387400
Reading config bytes to cdata[7] at 0x1b8387600
Reading config bytes to cdata[8] at 0x1b8387800
Reading config bytes to cdata[9] at 0x1b8387a00
Reading config bytes to cdata[10] at 0x1b8387c00
Reading config bytes to cdata[11] at 0x1b8387e00
Reading config bytes to cdata[12] at 0x1b8388000
Reading config bytes to cdata[13] at 0x1b8388200
Reading config bytes to cdata[14] at 0x1b8388400
Reading config bytes to cdata[15] at 0x1b8388600
Reading config bytes to cdata[16] at 0x1b8388800
Reading config bytes to cdata[17] at 0x1b8388a00
Reading config bytes to cdata[18] at 0x1b8388c00
Reading config bytes to cdata[19] at 0x1b8388e00
Reading config bytes to cdata[20] at 0x1b8389000
Reading config bytes to cdata[21] at 0x1b8389200
Reading config bytes to cdata[22] at 0x1b8389400
Reading config bytes to cdata[23] at 0x1b8389600
Reading config bytes to cdata[24] at 0x1b8389800
Reading config bytes to cdata[25] at 0x1b8389a00
Reading config bytes to cdata[26] at 0x1b8389c00
Reading config bytes to cdata[27] at 0x1b8389e00
Reading config bytes to cdata[28] at 0x1b838a000
Reading config bytes to cdata[29] at 0x1b838a200
Reading config bytes to cdata[30] at 0x1b838a400
Reading config bytes to cdata[31] at 0x1b838a600
Reading config bytes to cdata[32] at 0x1b838a800
Reading config bytes to cdata[33] at 0x1b838aa00
Reading config bytes to cdata[34] at 0x1b838ac00
Reading config bytes to cdata[35] at 0x1b838ae00
Reading config bytes to cdata[36] at 0x1b838b000
Reading config bytes to cdata[37] at 0x1b838b200
Reading config bytes to cdata[38] at 0x1b838b400
Reading config bytes to cdata[39] at 0x1b838b600
Reading config bytes to cdata[40] at 0x1b838b800
Reading config bytes to cdata[41] at 0x1b838ba00
Reading config bytes to cdata[42] at 0x1b838bc00
Reading config bytes to cdata[43] at 0x1b838be00
Reading config bytes to cdata[44] at 0x1b838c000
Reading config bytes to cdata[45] at 0x1b838c200
Reading config bytes to cdata[46] at 0x1b838c400
Reading config bytes to cdata[47] at 0x1b838c600
Reading config bytes to cdata[48] at 0x1b838c800
Reading config bytes to cdata[49] at 0x1b838ca00
Reading config bytes to cdata[50] at 0x1b838cc00
Reading config bytes to cdata[51] at 0x1b838ce00
Reading config bytes to cdata[52] at 0x1b838d000
Reading config bytes to cdata[53] at 0x1b838d200
Reading config bytes to cdata[54] at 0x1b838d400
Reading config bytes to cdata[55] at 0x1b838d600
Reading config bytes to cdata[56] at 0x1b838d800
Reading config bytes to cdata[57] at 0x1b838da00
Reading config bytes to cdata[58] at 0x1b838dc00
Reading config bytes to cdata[59] at 0x1b838de00
Reading config bytes to cdata[60] at 0x1b838e000
Reading config bytes to cdata[61] at 0x1b838e200
Reading config bytes to cdata[62] at 0x1b838e400
Reading config bytes to cdata[63] at 0x1b838e600
Reading config bytes to cdata[64] at 0x1b838e800
Reading config bytes to cdata[65] at 0x1b838ea00
Reading config bytes to cdata[66] at 0x1b838ec00
Reading config bytes to cdata[67] at 0x1b838ee00
Reading config bytes to cdata[68] at 0x1b838f000
Reading config bytes to cdata[69] at 0x1b838f200
Reading config bytes to cdata[70] at 0x1b838f400
Reading config bytes to cdata[71] at 0x1b838f600
Reading config bytes to cdata[72] at 0x1b838f800
Reading config bytes to cdata[73] at 0x1b838fa00
Reading config bytes to cdata[74] at 0x1b838fc00
Reading config bytes to cdata[75] at 0x1b838fe00
Reading config bytes to cdata[76] at 0x1b8390000
Reading config bytes to cdata[77] at 0x1b8390200
Reading config bytes to cdata[78] at 0x1b8390400
Reading config bytes to cdata[79] at 0x1b8390600
Reading config bytes to cdata[80] at 0x1b8390800
Reading config bytes to cdata[81] at 0x1b8390a00
Reading config bytes to cdata[82] at 0x1b8390c00
Reading config bytes to cdata[83] at 0x1b8390e00
Reading config bytes to cdata[84] at 0x1b8391000
Reading config bytes to cdata[85] at 0x1b8391200
Reading config bytes to cdata[86] at 0x1b8391400
Reading config bytes to cdata[87] at 0x1b8391600
Reading config bytes to cdata[88] at 0x1b8391800
Reading config bytes to cdata[89] at 0x1b8391a00
Reading config bytes to cdata[90] at 0x1b8391c00
Reading config bytes to cdata[91] at 0x1b8391e00
Reading config bytes to cdata[92] at 0x1b8392000
Reading config bytes to cdata[93] at 0x1b8392200
Reading config bytes to cdata[94] at 0x1b8392400
Reading config bytes to cdata[95] at 0x1b8392600
Reading config bytes to cdata[96] at 0x1b8392800
Reading config bytes to cdata[97] at 0x1b8392a00
Reading config bytes to cdata[98] at 0x1b8392c00
Reading config bytes to cdata[99] at 0x1b8392e00
Reading config bytes to cdata[100] at 0x1b8393000
Reading config bytes to cdata[101] at 0x1b8393200
Reading config bytes to cdata[102] at 0x1b8393400
Reading config bytes to cdata[103] at 0x1b8393600
Reading config bytes to cdata[104] at 0x1b8393800
Reading config bytes to cdata[105] at 0x1b8393a00
Reading config bytes to cdata[106] at 0x1b8393c00
Reading config bytes to cdata[107] at 0x1b8393e00
Reading config bytes to cdata[108] at 0x1b8394000
Reading config bytes to cdata[109] at 0x1b8394200
Reading config bytes to cdata[110] at 0x1b8394400
Reading config bytes to cdata[111] at 0x1b8394600
Reading config bytes to cdata[112] at 0x1b8394800
Reading config bytes to cdata[113] at 0x1b8394a00
Reading config bytes to cdata[114] at 0x1b8394c00
Reading config bytes to cdata[115] at 0x1b8394e00
Reading config bytes to cdata[116] at 0x1b8395000
Reading config bytes to cdata[117] at 0x1b8395200
Reading config bytes to cdata[118] at 0x1b8395400
Reading config bytes to cdata[119] at 0x1b8395600
Reading config bytes to cdata[120] at 0x1b8395800
Reading config bytes to cdata[121] at 0x1b8395a00
Reading config bytes to cdata[122] at 0x1b8395c00
Reading config bytes to cdata[123] at 0x1b8395e00
Reading config bytes to cdata[124] at 0x1b8396000
Reading config bytes to cdata[125] at 0x1b8396200
Reading config bytes to cdata[126] at 0x1b8396400
Reading config bytes to cdata[127] at 0x1b8396600
Reading config bytes to cdata[128] at 0x1b8396800
Reading config bytes to cdata[129] at 0x1b8396a00
Reading config bytes to cdata[130] at 0x1b8396c00
Reading config bytes to cdata[131] at 0x1b8396e00
SLOT 0 compressed data length 132:
0x01 0x00 0x01 0x01 0x00 0x01 0x10 0xbf 0x98 0x80 0x18 0xbf 0x98 0x80 
0x20 0xbf 
0x98 0x80 0x28 0xbf 0x98 0x80 0x11 0x01 0x27 0x55 0xa1 0x04 0x1d 0x10 
0xa3 0x24 
0x00 0x01 0x10 0xa3 0x24 0x00 0x01 0x11 0x00 0x1d 0x01 0x43 0x4f 0x4d 
0x31 0x00 
0xff 0x00 0x1a 0x10 0xa3 0x24 0x00 0x01 0x11 0x00 0x1d 0x01 0x43 0x4f 
0x4d 0x32 
0x00 0xff 0x00 0x1a 0x10 0xa3 0x24 0x00 0x01 0x11 0x00 0x1d 0x05 0x4c 
0x50 0x54 
0x31 0x00 0x8b 0x01 0x00 0x8d 0x10 0xa3 0x24 0x00 0x01 0x11 0x00 0x1d 
0x1d 0x46 
0x4c 0x4f 0x50 0x50 0x59 0x20 0x44 0x49 0x53 0x4b 0x20 0x43 0x4f 0x4e 
0x54 0x52 
0x4f 0x4c 0x4c 0x45 0x52 0x00 0x79 0x06 0x00 0x0d 0x02 0x00 0x07 0x07 
0xf0 0x03 
0x00 0x75 0x00 0x00 
SLOT 0 uncompressed header data:
0x01 0x00 0x01 0x00 0x10 0xbf 0x98 0x80 0x18 0xbf 0x98 0x80 0x20 0xbf 
0x98 0x80 
0x28 0xbf 0x98 0x80 0x11 0x01 0x27 0x55 0xa1 0x04 0x1d 0x10 0xa3 0x24 
0x00 
SLOT 0: ndevfuncs 4
SLOT 0:0 uncompressed data:
0x10 0xa3 0x24 0x00 0x11 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x01 0x43 0x4f 0x4d 0x31 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x01 0x00 0x01 0x01 0x00 0x01 0x10 0xbf 0x98 0x80 0x18 0xbf 0x98 0x80 
0x20 0xbf 
0x98 0x80 0x28 0xbf 0x98 0x80 0x11 0x01 0x27 0x55 0xa1 0x04 0x1d 0x10 
0xa3 0x24 
0x00 0x01 0x10 0xa3 0x24 0x00 0x01 0x11 0x00 0x1d 0x01 0x43 0x4f 0x4d 
0x31 0x00 
0xff 0x00 0x1a 0x10 0xa3 0x24 0x00 0x01 0x11 0x00 0x1d 0x01 0x43 0x4f 
0x4d 0x32 
0x00 0xff 0x00 0x1a 0x10 0xa3 0x24 0x00 0x01 0x11 0x00 0x1d 0x05 0x4c 
0x50 0x54 
0x31 0x00 0x8b 0x01 0x00 0x8d 0x10 0xa3 0x24 0x00 0x01 0x11 0x00 0x1d 
0x1d 0x46 
0x4c 0x4f 0x50 0x50 0x59 0x20 0x44 0x49 0x53 0x4b 0x20 0x43 0x4f 0x4e 
0x54 0x52 
0x4f 0x4c 0x4c 0x45 0x52 0x00 0x79 0x06 0x00 0x0d 0x02 0x00 0x07 0x07 
0xf0 0x03 
0x00 0x75 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
[...]
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 
CPU 0: fatal kernel trap:
CPU 0    trap entry =3D 0x2 (memory management fault)
CPU 0    a0         =3D 0xfffffe0000058000
CPU 0    a1         =3D 0x1
CPU 0    a2         =3D 0x0
CPU 0    pc         =3D 0xfffffc00005903b0
CPU 0    ra         =3D 0xfffffc00005903a4
CPU 0    pv         =3D 0xfffffc00004974a0
CPU 0    curlwp    =3D 0xfffffc0000bc3940
CPU 0        pid =3D 0, comm =3D swapper
panic: trap
Stopped in pid 0.1 (swapper) at 0xfffffc00005da0c0:     ret     
zero,(ra)
db> 
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Regards, Christoph