hi,
> 
> Interesting ! Could you send me you config file ?
yup! no problem. here we go: 

#	$NetBSD: GENERIC,v 1.231 1999/03/29 21:51:25 perry Exp $
#
#	GENERIC -- everything that's currently supported
#

include "arch/i386/conf/std.i386"

maxusers	32		# estimated number of users

# CPU support.  At least one is REQUIRED.
options 	I486_CPU
options 	I586_CPU

# NO CPU-related options.

# Misc. i386-specific options
options 	XSERVER		# X server support in console drivers

# Standard system options

#options 	UCONSOLE	# users can use TIOCCONS (for xconsole)
options 	INSECURE	# disable kernel security levels

options 	RTC_OFFSET=0	# hardware clock is this many mins. west of GMT
#options 	NTP		# NTP phase/frequency locked loop

options 	KTRACE		# system call tracing via ktrace(1)

options 	SYSVMSG		# System V-like message queues
options 	SYSVSEM		# System V-like semaphores
options 	SYSVSHM		# System V-like memory sharing
#options 	SHMMAXPGS=1024	# 1024 pages is the default

#options 	LKM		# loadable kernel modules

# Diagnostic/debugging support options
#options 	DIAGNOSTIC	# cheap kernel consistency checks
#options 	DEBUG		# expensive debugging checks/support
#options 	KMEMSTATS	# kernel memory statistics (vmstat -m)
options 	DDB		# in-kernel debugger
#options 	DDB_HISTORY_SIZE=100	# enable history editing in DDB
#options 	KGDB		# remote debugger
#options 	"KGDB_DEVNAME=\"com\"",KGDBADDR=0x3f8,KGDBRATE=9600
#makeoptions	DEBUG="-g"	# compile full symbol table

# Compatibility options
options 	COMPAT_NOMID	# compatibility with 386BSD, BSDI, NetBSD 0.8,
options 	COMPAT_09	# NetBSD 0.9,
options 	COMPAT_10	# NetBSD 1.0,
options 	COMPAT_11	# NetBSD 1.1,
options 	COMPAT_12	# NetBSD 1.2,
options 	COMPAT_13	# NetBSD 1.3,
options 	COMPAT_43	# and 4.3BSD
options 	COMPAT_386BSD_MBRPART # recognize old partition ID

#options 	COMPAT_SVR4	# binary compatibility with SVR4
#options 	COMPAT_IBCS2	# binary compatibility with SCO and ISC
#options 	COMPAT_LINUX	# binary compatibility with Linux
#options 	COMPAT_FREEBSD	# binary compatibility with FreeBSD

# Executable format options
#options 	EXEC_ELF32	# 32-bit ELF executables (SVR4, Linux)

# File systems
file-system 	FFS		# UFS
#file-system 	EXT2FS		# second extended file system (linux)
#file-system 	LFS		# log-structured file system
file-system 	MFS		# memory file system
file-system 	NFS		# Network File System client
#file-system 	CD9660		# ISO 9660 + Rock Ridge file system
#file-system 	MSDOSFS		# MS-DOS file system
#file-system 	FDESC		# /dev/fd
#file-system 	KERNFS		# /kern
#file-system 	NULLFS		# loopback file system
#file-system 	PORTAL		# portal filesystem (still experimental)
#file-system 	PROCFS		# /proc
#file-system 	UMAPFS		# NULLFS + uid and gid remapping
#file-system 	UNION		# union file system
#file-system	CODA		# Coda File System; also needs vcoda (below)

# NO File system options

# Networking options
options 	INET		# IP + ICMP + TCP + UDP

options 	NFS_BOOT_BOOTPARAM

# NO wscons options

# Kernel root file system and dump configuration.
config		netbsd	root on ? type ?
#config		netbsd	root on sd0a type ffs
#config		netbsd	root on ? type nfs

#
# Device configuration
#

mainbus0 at root

# Basic Bus Support

# NO PCI bus support

# NO EISA bus support

# ISA bus support
isa*	at mainbus?

# NO PCMCIA bus support

# Coprocessor Support

# Math Coprocessor support
npx0	at isa? port 0xf0 irq 13	# x86 math coprocessor


# Console Devices

# ISA console.  You can only configure one of these!
#pc0	at isa? port 0x60 irq 1		# pccons generic PC console driver
vt0	at isa? port 0x60 irq 1		# PCVT console driver

# NO wscons

# NO Serial Devices

# NO Parallel Printer Interfaces

# NO SCSI Controllers and Devices

# IDE and related devices
# NO PCI IDE controllers - see pciide(4) for supported hardware.

# NO ISA Plug-and-Play IDE controllers

# NO PCMCIA IDE controllers

# ISA ST506, ESDI, and IDE controllers
wdc0	at isa? port 0x1f0 irq 14

# IDE drives
# Flags are used only with controllers that support DMA operations
# and mode settings (e.g. some pciide controllers)
# The lowest order four bits (rightmost digit) of the flags define the PIO
# mode to use, the next set of four bits the DMA mode and the third set the
# UltraDMA mode. For each set of four bits, the 3 lower bits define the mode
# to use, and the last bit must be 1 for this setting to be used.
# For DMA and UDMA, 0xf (1111) means 'disable'.
# 0x0fac means 'use PIO mode 4, DMA mode 2, disable UltraDMA'.
# (0xc=1100, 0xa=1010, 0xf=1111)
# 0x0000 means "use whatever the drive claims to support".
wd*	at wdc? channel ? drive ? flags 0x0000


# NO ATAPI bus support

# NO ATAPI devices

# NO Miscellaneous mass storage devices

# Network Interfaces

# NO PCI network interfaces

# NO EISA network interfaces

# NO ISA Plug-and-Play network interfaces

# NO PCMCIA network interfaces

# ISA network interfaces
ep0	at isa? port ? irq ?			# 3C509 ethernet cards

# NO MII/PHY support

# NO USB Controller and Devices

# NO Audio Devices

# NO Mice

# NO Joysticks

# NO Miscellaneous Devices

# Pull in optional local configuration
include	"arch/i386/conf/GENERIC.local"

# Pseudo-Devices

# NO disk/mass storage pseudo-devices

# network pseudo-devices
pseudo-device	bpfilter	8	# Berkeley packet filter
pseudo-device	loop			# network loopback

# miscellaneous pseudo-devices
pseudo-device	pty		16	# pseudo-terminals
# rnd works; RND_COM does not on port i386 yet.
pseudo-device	rnd			# /dev/random and in-kernel generator


> I'll try to get the line in the code corresponding to
> _wdc_ata_bio_intr+0x372 
> Is this with 1.4_ALPHA, BETA, or 1.4 ?
this is what was suppable last friday or so as current, 1.4 now, I think.
a freshly compiled kernel from sources supped this morning does the same.
and the snapshot kernel from the install floppies from April 21. failed
this way, too.

if you need any further information or testing or... just ask!

-ks