Hello,

Have just recently put together a system and installed NetBSD 2.0.
Motherboard MSI-6103, dual 200Mhz Pentium PRO CPUs.
Adaptec 2940 Ultra SCSI.
The system will boot just fine when using the GENERIC kernel (or
GENERIC.MP with and IDE drive) however it gives up with GENERIC.MP and
the SCSI adapter/disk installed. Here's the output I managed to grab via
the serial console:


------------------ start dmesg -------------------------
boot netbsd.mp
booting hd0a:netbsd.mp
BIOS CFG: Model-SubM-Rev: fc-01-00, 0x70<KBDINT,RTC,IC2>
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
    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 2.0 (GENERIC.MP) #0: Wed Dec  1 11:06:48 UTC 2004
builds@build:/big/builds/ab/netbsd-2-0-RELEASE/i386/200411300000Z-obj/big/builds/ab/netbsd-2-0-RELEASE/src/sys/arch/i386/compile/GENERIC.MP
total memory = 127 MB
avail memory = 117 MB
BIOS32 rev. 0 found at 0xfb530
mainbus0 (root)
mainbus0: Intel MP Specification (Version 1.1) (OEM00000 PROD00000000)
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel Pentium Pro (686-class), 199.81 MHz, id 0x619
cpu0: features fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu0: features fbff<PGE,MCA,CMOV>
cpu0: I-cache 8 KB 32B/line 4-way, D-cache 8 KB 32B/line 2-way
cpu0: L2 cache 256 KB 32B/line 4-way
cpu0: ITLB 32 4 KB entries 4-way, 2 4 MB entries fully associative
cpu0: DTLB 64 4 KB entries 4-way, 8 4 MB entries 4-way
cpu0: calibrating local timer
cpu0: apic clock running at 66 MHz
cpu0: 16 page colors
cpu1 at mainbus0: apid 1 (application processor)
cpu1: starting
cpu1: Intel Pentium Pro (686-class), 199.79 MHz, id 0x619
cpu1: features fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu1: features fbff<PGE,MCA,CMOV>
cpu1: I-cache 8 KB 32B/line 4-way, D-cache 8 KB 32B/line 2-way
cpu1: L2 cache 256 KB 32B/line 4-way
cpu1: ITLB 32 4 KB entries 4-way, 2 4 MB entries fully associative
cpu1: DTLB 64 4 KB entries 4-way, 8 4 MB entries 4-way
mpbios: bus 0 is type PCI   
mpbios: bus 1 is type ISA   
ioapic0 at mainbus0 apid 2 (I/O APIC)
ioapic0: pa 0xfec00000, version 11, 24 pins
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
pchb0 at pci0 dev 0 function 0
pchb0: Intel 82441FX PCI and Memory Controller (PMC) (rev. 0x02)
pcib0 at pci0 dev 7 function 0
pcib0: Intel 82371SB PCI-to-ISA Bridge (PIIX3) (rev. 0x01)
piixide0 at pci0 dev 7 function 1
piixide0: Intel 82371SB IDE Interface (PIIX3) (rev. 0x00)
piixide0: bus-master DMA support present
piixide0: primary channel wired to compatibility mode
piixide0: primary channel interrupting at ioapic0 pin 14 (irq 14)
atabus0 at piixide0 channel 0
piixide0: secondary channel wired to compatibility mode
piixide0: secondary channel interrupting at ioapic0 pin 15 (irq 15)
atabus1 at piixide0 channel 1
ex0 at pci0 dev 13 function 0: 3Com 3c905B-TX 10/100 Ethernet (rev.
0x30)
ex0: interrupting at ioapic0 pin 17 (irq 11)
ex0: MAC address 00:10:5a:30:3f:c6
exphy0 at ex0 phy 24: 3Com internal media interface
exphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
vga1 at pci0 dev 14 function 0: S3 ViRGE/DX (rev. 0x01)
wsdisplay0 at vga1 kbdmux 1
wsmux1: connecting to wsdisplay0
ahc1 at pci0 dev 15 function 0: Adaptec 2940 Ultra SCSI adapter
ahc1: interrupting at ioapic0 pin 9 (irq 9)
ahc1: aic7880: Ultra Wide Channel A, SCSI Id=1, 16/253 SCBs
scsibus0 at ahc1: 16 targets, 8 luns per target
isa0 at pcib0
lpt0 at isa0 port 0x378-0x37b irq 7
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com0: console
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
pckbc0 at isa0 port 0x60-0x64
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0 mux 1
wskbd0: connecting to wsdisplay0
pcppi0 at isa0 port 0x61
midi0 at pcppi0: PC speaker
sysbeep0 at pcppi0
isapnp0 at isa0 port 0x279: ISA Plug 'n Play device support
npx0 at isa0 port 0xf0-0xff: using exception 16
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
isapnp0: no ISA Plug 'n Play devices found
ioapic0: enabling
fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
Kernelized RAIDframe activated
scsibus0: waiting 2 seconds for devices to settle...
atapibus0 at atabus0: 2 targets
cd0 at atapibus0 drive 0: <MATSHITA CR-583, , 1.04> cdrom removable
cd0: 32-bit data port
cd0: drive supports PIO mode 3, DMA mode 1
cd0(piixide0:0:0): using PIO mode 0, DMA mode 1 (using DMA data
transfers)
ahc1: Timedout SCB already complete. Interrupts may not be functioning.
ahc1: Timedout SCB already complete. Interrupts may not be functioning.
ahc1: Timedout SCB already complete. Interrupts may not be functioning.
ahc1: Timedout SCB already complete. Interrupts may not be functioning.
ahc1: Timedout SCB already complete. Interrupts may not be functioning.
ahc1:SCB 0xe - timed out
>>>>>>>>>>>>>>>>>> Dump Card State Begins <<<<<<<<<<<<<<<<<
ahc1: Dumping Card State in Message-out phase, at SEQADDR 0x172
Card was paused
ACCUM = 0xa0, SINDEX = 0x61, DINDEX = 0xc0, ARG_2 = 0x3
HCNT = 0x0 SCBPTR = 0x0
SCSISIGI[0xb6] ERROR[0x0] SCSIBUSL[0x1] LASTPHASE[0xa0] 
SCSISEQ[0x12] SBLKCTL[0x2] SCSIRATE[0x0] SEQCTL[0x10] 
SEQ_FLAGS[0x40] SSTAT0[0x7] SSTAT1[0x3] SSTAT2[0x0] 
SSTAT3[0x0] SIMODE0[0x0] SIMODE1[0xac] SXFRCTL0[0x88] 
DFCNTRL[0x4] DFSTATUS[0x6d] 
STACK: 0xe7 0x0 0x0 0x19c
SCB count = 16
Kernel NEXTQSCB = 15
Card NEXTQSCB = 15
QINFIFO entries: 
Waiting Queue entries: 
Disconnected Queue entries: 
QOUTFIFO entries: 
Sequencer Free SCB List: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 
Sequencer SCB Info: 
  0 SCB_CONTROL[0x40] SCB_SCSIID[0x61] 
SCB_LUN[0x0] SCB_TAG[0xe] 
  1 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  2 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  3 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  4 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  5 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  6 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  7 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  8 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  9 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
 10 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
 11 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
 12 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
 13 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
 14 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
 15 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
Pending list: 
 14 SCB_CONTROL[0x40] SCB_SCSIID[0x61] 
SCB_LUN[0x0] 
Kernel Free SCB list: 13 12 11 10 9 8 7 6 5 4 3 2 1 0 
Untagged Q(6): 14 

<<<<<<<<<<<<<<<<< Dump Card State Ends >>>>>>>>>>>>>>>>>>
sg[0] - Addr 0x14a7e94 : Length 36
ahc1:BDR message in message buffer
ahc1:SCB 0xe - timed out
>>>>>>>>>>>>>>>>>> Dump Card State Begins <<<<<<<<<<<<<<<<<
ahc1: Dumping Card State in Message-out phase, at SEQADDR 0x172
Card was paused
ACCUM = 0xa0, SINDEX = 0x61, DINDEX = 0xc0, ARG_2 = 0x3
HCNT = 0x0 SCBPTR = 0x0
SCSISIGI[0xb6] ERROR[0x0] SCSIBUSL[0x2] LASTPHASE[0xa0] 
SCSISEQ[0x12] SBLKCTL[0x2] SCSIRATE[0x0] SEQCTL[0x10] 
SEQ_FLAGS[0x40] SSTAT0[0x7] SSTAT1[0x3] SSTAT2[0x0] 
SSTAT3[0x0] SIMODE0[0x0] SIMODE1[0xac] SXFRCTL0[0x88] 
DFCNTRL[0x4] DFSTATUS[0x6d] 
STACK: 0xe7 0x0 0x0 0x19c
SCB count = 16
Kernel NEXTQSCB = 15
Card NEXTQSCB = 15
QINFIFO entries: 
Waiting Queue entries: 
Disconnected Queue entries: 
QOUTFIFO entries: 
Sequencer Free SCB List: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 
Sequencer SCB Info: 
  0 SCB_CONTROL[0x40] SCB_SCSIID[0x61] 
SCB_LUN[0x0] SCB_TAG[0xe] 
  1 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  2 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  3 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  4 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  5 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  6 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  7 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  8 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
  9 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
 10 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
 11 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
 12 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
 13 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
 14 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
 15 SCB_CONTROL[0x0] SCB_SCSIID[0xff] 
SCB_LUN[0xff] SCB_TAG[0xff] 
Pending list: 
 14 SCB_CONTROL[0x40] SCB_SCSIID[0x61] 
SCB_LUN[0x0] 
Kernel Free SCB list: 13 12 11 10 9 8 7 6 5 4 3 2 1 0 
Untagged Q(6): 14 

<<<<<<<<<<<<<<<<< Dump Card State Ends >>>>>>>>>>>>>>>>>>
sg[0] - Addr 0x14a7e94 : Length 36
probe(ahc1:0:6:0): ahc1: no longer in timeout, status = 0
ahc1: Issued Channel A Bus Reset. 1 SCBs aborted

---------------- end dmesg ------------------

Has anybody had this problem and if so any suggestions how I might fix
it? I've got kernel sources available.
I've submitted a PR.

Many thanks,
-- 
Nick B.