I'm out of my depth with Intel hardware; pointers appreciated!

The short version (with a short question at the end) is: I had a stable
Pentium 166 running NetBSD 1.4.1, with a SCSI adaptor and a bunch of
disks.  I decided to upgrade to a Pentium III 866, and at about the same
time, one of my disks failed.  I figured then was as good a time as any
to do my hardware upgrade, since I'd be playing with the system anyway.

I assembled the new motherboard, CPU, and RAM in an appropriate case,
and added the floppy drive from the old system.  I was able to boot NetBSD
from the 1.4.1 boot floppy.  Then I moved the PCI SCSI controller and its
devices (except for the dead disk, which was not the terminated device,
BTW) to the new system, and there the problems started.

Over a period of many hours, I tried the SCSI controller in each of the
three PCI slots on that motherboard, and I changed the PROM settings to
enable or disable various onboard devices (to try to solve IRQ conflicts).
I tried to boot a 1.4.1 floppy, a set of 1.5.2 floppies, and my 1.4.1
system on disk (and even a couple of Slackware Linux floppies!).

In some configurations, the system took a very long time to boot, even
at the hardware level, and NetBSD reported a lot of this kind of
stuff:

  probe(ahc1:0:0): SCB 1d - timed out in Message-out phase, SEQADDR ==
    0xbb SCSIRATE == 0x0
  probe(ahc1:0:0): BDR message in message buffer
  probe(ahc1:0:0): SCB 1d - timed out in Message-out phase, SEQADDR ==
    0x153 SCSIRATE == 0x0
  probe(ahc1:0:0): no longer in timeout, status = 0
  ahc1: Issued Channel A Bus Reset. 1 SCBs aborted

In some configurations, I could boot from floppy (with the SCSI
adaptor reported as "ahc1: aic7880 Single Channel A, SCSI Id=7, 16/255
SCBs"), with 14 "Timedout SCB handled by another timeout" reports.  At
least some efforts to boot from disk ended up with a kernel panic.  In
case it's of use, I append /kern/msgbuf from one of the 1.5.2-floppy
attempts (with SCSI controller installed but no disks connected).

At the hardware level, most of the time, the reset/power-up sequence of
the SCSI adaptor reported all devices correctly, though at least a few
times it hung during its report of devices.  In those cases, cycling
the power solved that.  The SCSISelect (TM) utilities were able to see
the disks, and I even started scanning one for bad blocks just to show
it worked.

My question is this: is an old SCSI adaptor (aic7880) supposed to work
with a fancy fast new motherboard, or might it be too slow for the
motherboard?  I *thought* that PCI was PCI, but I'm starting to wonder.


Anne.
----------------------------------------------------------------------------
NetBSD 1.5.2 (INSTALL) #3: Sat Aug 18 23:52:07 CEST 2001
    he@hamster.urc.uninett.no:/usr/src/sys/arch/i386/compile/INSTALL
cpu0: Intel Pentium III (Coppermine) (686-class), 866.87 MHz
total memory = 991 MB
avail memory = 913 MB
using 11424 buffers containing 50872 KB of memory
BIOS32 rev. 0 found at 0xfdae0
mainbus0 (root)
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o space, memory space enabled
pchb0 at pci0 dev 0 function 0
pchb0: vendor 0x10b9 product 0x1621 (rev. 0x04)
ppb0 at pci0 dev 1 function 0: vendor 0x10b9 product 0x5247 (rev. 0x01)
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled
vendor 0x10de product 0x00a0 (VGA display, revision 0x20) at pci1 dev 0 function 0 not configured
ohci0 at pci0 dev 2 function 0: vendor 0x10b9 product 0x5237 (rev. 0x03)
ohci0: interrupting at irq 10
ohci0: OHCI version 1.0, legacy support
usb0 at ohci0: USB revision 1.0
uhub0 at usb0
uhub0: vendor 0x10b9 OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
pcib0 at pci0 dev 7 function 0
pcib0: vendor 0x10b9 product 0x1533 (rev. 0xc3)
vendor 0x13f6 product 0x0111 (audio multimedia, revision 0x10) at pci0 dev 12 function 0 not configured
vendor 0x13f6 product 0x0211 (miscellaneous communications, revision 0x10) at pci0 dev 12 function 1 not configured
sip0 at pci0 dev 14 function 0: SiS 900 10/100 Ethernet
sip0: interrupting at irq 5
sip0: Ethernet address 00:d0:09:63:8d:9d
ukphy0 at sip0 phy 0: Generic IEEE 802.3u media interface
ukphy0: OUI 0x000760, model 0x0000, rev. 0
ukphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
pciide0 at pci0 dev 15 function 0: Acer Labs M5229 UDMA IDE Controller (rev. 0xc2)
pciide0: bus-master DMA support present
pciide0: primary channel configured to compatibility mode
pciide0: disabling primary channel (no drives)
pciide0: secondary channel configured to compatibility mode
pciide0: disabling secondary channel (no drives)
ahc1 at pci0 dev 18 function 0
ahc1: interrupting at irq 11
ahc1: aic7880 Single Channel A, SCSI Id=7, 16/255 SCBs
scsibus0 at ahc1 channel 0: 8 targets, 8 luns per target
isa0 at pcib0
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
isapnp0 at isa0 port 0x279: ISA Plug 'n Play device support
npx0 at isa0 port 0xf0-0xff: using exception 16
pc0 at isa0 port 0x60-0x6f irq 1: color
pc0: console
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
isapnp0: no ISA Plug 'n Play devices found
biomask ffcd netmask ffed ttymask ffef
scsibus0: waiting 2 seconds for devices to settle...
Timedout SCB handled by another timeout
Timedout SCB handled by another timeout
Timedout SCB handled by another timeout
Timedout SCB handled by another timeout
Timedout SCB handled by another timeout
Timedout SCB handled by another timeout
Timedout SCB handled by another timeout
Timedout SCB handled by another timeout
Timedout SCB handled by another timeout
Timedout SCB handled by another timeout
Timedout SCB handled by another timeout
Timedout SCB handled by another timeout
Timedout SCB handled by another timeout
Timedout SCB handled by another timeout
md0: internal 2048K image area
boot device: fd0
root on md0a dumps on md0b
root file system type: ffs
----------------------------------------------------------------------------