I'm having trouble booting a Sun 4/300 with NetBSD 1.3.  NetBSD 1.2.1
boots the machine just fine (at least no error messages), but 1.3 gives
the following output:

Booting netbsd @ 0x4000
1376256+116880+73776+[77844+91083]=0x1abca7
console is ttya
Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 1.3 (GENERIC) #0: Thu Jan  1 18:26:28 MET 1998
    pk@flambard:/usr/src1/sys/arch/sparc/compile/GENERIC
real mem = 33529856
avail mem = 29835264
using 204 buffers containing 1671168 bytes of memory
bootpath: /obio0/esp0/sd@0,0
mainbus0 (root): SUN-4/300 series
cpu0 at mainbus0: cache chip bug; trap page uncached: CY7C601 @ 25 MHz,
L64812 o
r ACT8847 FPU
cpu0: 128K byte write-back, 16 bytes/line, sw flush: cache enabled
obio0 at minbus0
le0 at obio0 addr 0xf9000000 pri 6: address 08:00:20:0b:62:e6
le0: 8 receive buffers, 2 transmit buffers
clock0 at obio0 addr 0xf2000000: mk48t02 (eeprom)
timer0 at obio0 addr 0xef000000 delay constant 10
memreg0 at obio0 addr 0xf4000000
zs0 at obio0 addr 0xf1000000 pri 12, softpri 6
zstty0 at zs0 channel 0 (console)
zstty1 at zs0 channel 1
zs1 at obio0 addr 0xf0000000 pri 12, softpri 6
kbd0 at zs1 channel 0
ms0 at zs1 channel 1
zs2 at obio0 addr 0xe0000000 pri 12, softpri 6
zstty2 at zs2 channel 0
zstty3 at zs2 channel 1
dma0 at obio0 addr 0xfa001000: rev 0
esp0 at obio0 addr 0xfa000000 pri 4: ESP100A, 24MHz, SCSI ID 7
scsibus0 at esp0: 8 targets
probe(esp0:0:0): max sync rate 4.80Mb/s
sd0 at scsibus0 targ 0 lun 0: <SEAGATE, ST41651, 7668> SCSI2 0/direct
fixed
sd0: 1350MB, 2107 cyl, 15 head, 87 sec, 512 bytes/sect x 2766300 sectors
vmel0 at mainbus0
vmes0 at mainbus0
root on sd0a dumps on sd0b
(esp0:0:0): select; 6 left in DMA buffer
esp0: unexpected disconnect; sending REQUEST SENSE
(esp0:0:0): select; 6 left in DMA buffer
esp0: unexpected disconnect; resetting
sd0(esp0:0:0): max sync rate 4.80Mb/s
(esp0:0:0): select; 6 left in DMA buffer
esp0: unexpected disconnect; resetting

[... more of same deleted ...]

sd0(esp0:0:0): max sync rate 4.80Mb/s
(esp0:0:0): select; 6 left in DMA buffer
esp0: unexpected disconnect; resetting
no file system for sd0 (dev 0x700)
cannot mount root, error = 79
root device (default sd0a):

I've also tried OpenBSD 2.1 and 2.2 on this machine (2.1 works, 2.2 gives
similiar messages).  I've check the drive's termination, and I'm at a loss
now.  Any pointers?

--Jason