Hardware:  SuperMicro X5DE8-GG motherboard, dual Xeon 2.8Ghz, 2GB memory.
Using onboard SCSI controller for disks, onboard IDE for DVD burner.  DVD
burner is a Pioneer DVR-108.

Software:  cdrecord and/or cdrecord-ProDVD.

Problem:  CD burning Always Fails.  Failure mode is 100% repeatable and

        cdrecord: Input/output error. write_g1: scsi sendcmd: retryable error
        CDB:  2A 00 00 00 01 55 00 00 1F 00
        status: 0x2 (CHECK CONDITION)
        Sense Bytes: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 00 00
        Sense Key: 0xFFFFFFFF [], Segment 0
        Sense Code: 0x00 Qual 0x00 (no additional sense information) Fru 0x0
        Sense flags: Blk 0 (not valid)
        cmd finished after 0.000s timeout 40s
        write track data: error after 698368 bytes
        Sense Bytes: 70 00 02 00 00 00 00 0E 00 00 00 00 04 08 00 00 00 00

Mr. Schilling says "Install a non-defective kernel."  I am assuming that this
doesn't mean "some other OS".

Googling around on the CDB bytes turns up lots of people with cabling
problems, especially on SCSI busses.

Googling around on FreeBSD and 698368 turns up someone who needed the P1003_1B
option added to a kernel.  (It's now just the _KPOSIX option, and it's already
in there.)

I got as far as putting in the atapicam and related devices.  This happens
whether or not I leave the atapicd driver in place.  (dmesg output below is

I enclose dmesg and config file as attachments for perusal.  I am Very Worried
by the observation that the CD is claiming a 3.300MB/sec transfer rate:

        cd0 at ata0 bus 0 target 0 lun 0
        cd0: <PIONEER DVD-RW  DVR-108 1.10> Removable CD-ROM SCSI-0 device
        cd0: 3.300MB/s transfers

This is almost certainly incorrect; it should be ATA66, and I have an 80-pin

I'm not *totally* hopeless:
# cat /boot/loader.conf

but I can't tell whether that's fixed anything.

My hypothesis is that I have somehow failed to persuade the kernel to Really
And Truly do DMA on this device, and that it's fallen back on a pathetically
slow and inappropriate PIO mode.

Clues will be gratefully appreciated; also, since I've seen other people with
similar problems, if I can find a fix, I will write about it and put lots of
happy Google-friendly keywords in it so fewer people will ask in the future.

Dmesg output:
Copyright (c) 1992-2004 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD 5.2.1-RELEASE #0: Thu Oct 14 20:07:13 EDT 2004
    [EMAIL PROTECTED]:/usr/src/sys/i386/compile/JPC
Preloaded elf kernel "/boot/kernel/kernel" at 0xc09e8000.
MPTable: <AMI      GCHE        >
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(TM) CPU 2.80GHz (2800.12-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf25  Stepping = 5
  Hyperthreading: 2 logical CPUs
real memory  = 2147483648 (2048 MB)
avail memory = 2080739328 (1984 MB)
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  6
 cpu3 (AP): APIC ID:  7
ioapic0: Assuming intbase of 0
ioapic1: Assuming intbase of 16
ioapic2: Assuming intbase of 32
ioapic3: Assuming intbase of 48
ioapic0 <Version 1.1> irqs 0-15 on motherboard
ioapic1 <Version 1.1> irqs 16-31 on motherboard
ioapic2 <Version 1.1> irqs 32-47 on motherboard
ioapic3 <Version 1.1> irqs 48-63 on motherboard
Pentium Pro MTRR support enabled
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcibios: BIOS version 2.10
Using $PIR table, 11 entries at 0xc00f4a20
pcib0: <MPTable Host-PCI bridge> at pcibus 0 on motherboard
pci0: <PCI bus> on pcib0
pcib0: slot 8 INTA routed to irq 28
pcib0: slot 9 INTA routed to irq 26
pcib0: slot 10 INTA routed to irq 30
pcib0: slot 10 INTB routed to irq 31
pcib0: slot 11 INTA routed to irq 29
pcib0: slot 15 INTA routed to irq 17
pcib1: <MPTable PCI-PCI bridge> at device 6.0 on pci0
pci1: <PCI bus> on pcib1
pcib1: slot 8 INTA routed to irq 22
pcib1: slot 9 INTA routed to irq 23
pcib1: slot 9 INTB routed to irq 18
pcib1: slot 9 INTC routed to irq 19
fwohci0: <VIA VT6306> port 0xa800-0xa87f mem 0xfc8ff000-0xfc8ff7ff irq 22 at device 
8.0 on pci1
fwohci0: OHCI version 1.0 (ROM=1)
fwohci0: No. of Isochronous channel is 8.
fwohci0: EUI64 00:11:06:00:00:00:50:66
fwohci0: Phy 1394a available S400, 3 ports.
fwohci0: Link S400, max_rec 2048 bytes.
firewire0: <IEEE1394(FireWire) bus> on fwohci0
fwe0: <Ethernet over FireWire> on firewire0
if_fwe0: Fake Ethernet address: 02:11:06:00:50:66
sbp0: <SBP-2/SCSI over FireWire> on firewire0
fwohci0: Initiate bus reset
fwohci0: BUS reset
fwohci0: node_id=0xc800ffc0, gen=1, CYCLEMASTER mode
firewire0: 1 nodes, maxhop <= 0, cable IRM = 0 (me)
firewire0: bus manager 0 (me)
ohci0: <NEC uPD 9210 USB controller> mem 0xfc8fd000-0xfc8fdfff irq 23 at device 9.0 on 
usb0: OHCI version 1.0
usb0: <NEC uPD 9210 USB controller> on ohci0
usb0: USB revision 1.0
uhub0: NEC OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 3 ports with 3 removable, self powered
ohci1: <NEC uPD 9210 USB controller> mem 0xfc8fe000-0xfc8fefff irq 18 at device 9.1 on 
usb1: OHCI version 1.0
usb1: <NEC uPD 9210 USB controller> on ohci1
usb1: USB revision 1.0
uhub1: NEC OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
pci1: <serial bus, USB> at device 9.2 (no driver attached)
em0: <Intel(R) PRO/1000 Network Connection, Version - 1.7.19> port 0xc800-0xc83f mem 
0xfea60000-0xfea7ffff irq 28 at device 8.0 on pci0
em0:  Speed:N/A  Duplex:N/A
em1: <Intel(R) PRO/1000 Network Connection, Version - 1.7.19> port 0xd000-0xd03f mem 
0xfeba0000-0xfebbffff irq 26 at device 9.0 on pci0
em1:  Speed:N/A  Duplex:N/A
ahd0: <Adaptec AIC7902 Ultra320 SCSI adapter> port 0xd400-0xd4ff,0xd800-0xd8ff mem 
0xfebfa000-0xfebfbfff irq 30 at device 10.0 on pci0
aic7902: Ultra320 Wide Channel A, SCSI Id=7, PCI 33 or 66Mhz, 512 SCBs
ahd1: <Adaptec AIC7902 Ultra320 SCSI adapter> port 0xe000-0xe0ff,0xe400-0xe4ff mem 
0xfebfc000-0xfebfdfff irq 31 at device 10.1 on pci0
aic7902: Ultra320 Wide Channel B, SCSI Id=7, PCI 33 or 66Mhz, 512 SCBs
pci0: <display, VGA> at device 11.0 (no driver attached)
atapci0: <ServerWorks CSB6 UDMA100 controller> port 
0xffa0-0xffaf,0x374-0x377,0x170-0x177,0x3f4-0x3f7,0x1f0-0x1f7 at device 15.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata0: [MPSAFE]
ata1: at 0x170 irq 15 on atapci0
ata1: [MPSAFE]
ohci2: <OHCI (generic) USB controller> mem 0xfebfe000-0xfebfefff irq 17 at device 15.2 
on pci0
usb2: OHCI version 1.0, legacy support
usb2: <OHCI (generic) USB controller> on ohci2
usb2: USB revision 1.0
uhub2: (0x1166) OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 4 ports with 4 removable, self powered
isab0: <PCI-ISA bridge> at device 15.3 on pci0
isa0: <ISA bus> on isab0
pcib255: <ServerWorks host to PCI bridge(unknown chipset)> at pcibus 255 on motherboard
pci255: <PCI bus> on pcib255
orm0: <Option ROM> at iomem 0xc0000-0xc7fff on isa0
pmtimer0 on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x64,0x60 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
fdc0: <Enhanced floppy controller (i82077, NE72065 or clone)> at port 
0x3f7,0x3f0-0x3f5 irq 6 drq 2 on isa0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: Generic chipset (ECP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/8 bytes threshold
ppbus0: <Parallel port bus> on ppc0
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
sio1 at port 0x2f8-0x2ff irq 3 on isa0
sio1: type 16550A
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
unknown: <PNP0303> can't assign resources (port)
unknown: <PNP0501> can't assign resources (port)
unknown: <PNP0501> can't assign resources (port)
unknown: <PNP0401> can't assign resources (port)
unknown: <PNP0700> can't assign resources (port)
Timecounters tick every 10.000 msec
Waiting 15 seconds for SCSI devices to settle
GEOM: create disk cd0 dp=0xc83f9600
GEOM: create disk da0 dp=0xc8796850
GEOM: create disk da1 dp=0xc879f450
da0 at ahd0 bus 0 target 0 lun 0
da0: <FUJITSU MAP3367NP 0108> Fixed Direct Access SCSI-3 device 
da0: 320.000MB/s transfers (160.000MHz, offset 127, 16bit), Tagged Queueing Enabled
da0: 35046MB (71775284 512 byte sectors: 255H 63S/T 4467C)
da1 at ahd0 bus 0 target 1 lun 0
da1: <FUJITSU MAP3367NP 0108> Fixed Direct Access SCSI-3 device 
da1: 320.000MB/s transfers (160.000MHz, offset 127, 16bit), Tagged Queueing Enabled
da1: 35046MB (71775284 512 byte sectors: 255H 63S/T 4467C)
cd0 at ata0 bus 0 target 0 lun 0
cd0: <PIONEER DVD-RW  DVR-108 1.10> Removable CD-ROM SCSI-0 device 
cd0: 3.300MB/s transfers
cd0: cd present [1 x 2048 byte records]
SMP: AP CPU #3 Launched!
SMP: AP CPU #1 Launched!
SMP: AP CPU #2 Launched!
Mounting root from ufs:/dev/da0s1a
em0: Link is up 100 Mbps Half Duplex

Kernel config file:
# GENERIC -- Generic kernel configuration file for FreeBSD/i386
# For more information on this file, please read the handbook section on
# Kernel Configuration Files:
#    http://www.FreeBSD.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig-config.html
# The handbook is also available locally in /usr/share/doc/handbook
# if you've installed the doc distribution, otherwise always see the
# FreeBSD World Wide Web server (http://www.FreeBSD.org/) for the
# latest information.
# An exhaustive list of options and more detailed explanations of the
# device lines is also present in the ../../conf/NOTES and NOTES files. 
# If you are in doubt as to the purpose or necessity of a line, check first 
# in NOTES.
# $FreeBSD: src/sys/i386/conf/GENERIC,v 1.394.2.3 2004/01/26 19:42:11 nectar Exp $

machine         i386
cpu             I486_CPU
cpu             I586_CPU
cpu             I686_CPU
ident           GENERIC

#To statically compile in device wiring instead of /boot/device.hints
#hints          "GENERIC.hints"         #Default places to look for devices.

#makeoptions    DEBUG=-g                #Build kernel with gdb(1) debug symbols

options         SCHED_4BSD              #4BSD scheduler
options         INET                    #InterNETworking
options         INET6                   #IPv6 communications protocols
options         FFS                     #Berkeley Fast Filesystem
options         SOFTUPDATES             #Enable FFS soft updates support
options         UFS_ACL                 #Support for access control lists
options         UFS_DIRHASH             #Improve performance on big directories
options         MD_ROOT                 #MD is a potential root device
options         NFSCLIENT               #Network Filesystem Client
options         NFSSERVER               #Network Filesystem Server
options         NFS_ROOT                #NFS usable as /, requires NFSCLIENT
options         MSDOSFS                 #MSDOS Filesystem
options         CD9660                  #ISO 9660 Filesystem
options         PROCFS                  #Process filesystem (requires PSEUDOFS)
options         PSEUDOFS                #Pseudo-filesystem framework
options         COMPAT_43               #Compatible with BSD 4.3 [KEEP THIS!]
options         COMPAT_FREEBSD4         #Compatible with FreeBSD4
options         SCSI_DELAY=15000        #Delay (in ms) before probing SCSI
options         KTRACE                  #ktrace(1) support
options         SYSVSHM                 #SYSV-style shared memory
options         SYSVMSG                 #SYSV-style message queues
options         SYSVSEM                 #SYSV-style semaphores
options         _KPOSIX_PRIORITY_SCHEDULING #Posix P1003_1B real-time extensions
options         KBD_INSTALL_CDEV        # install a CDEV entry in /dev
options         AHC_REG_PRETTY_PRINT    # Print register bitfields in debug
                                        # output.  Adds ~128k to driver.
options         AHD_REG_PRETTY_PRINT    # Print register bitfields in debug
                                        # output.  Adds ~215k to driver.
options         PFIL_HOOKS              # pfil(9) framework

# Debugging for use in -current
#options        DDB                     #Enable the kernel debugger
#options        INVARIANTS              #Enable calls of extra sanity checking
options         INVARIANT_SUPPORT       #Extra sanity checks of internal structures, 
required by INVARIANTS
#options        WITNESS                 #Enable checks to detect deadlocks and cycles
#options        WITNESS_SKIPSPIN        #Don't run witness on spinlocks for speed

# To make an SMP kernel, the next two are needed
options         SMP                     # Symmetric MultiProcessor Kernel
device          apic                    # I/O APIC

device          isa
device          eisa
device          pci

# Floppy drives
device          fdc

# ATA and ATAPI devices
device          ata
device          atadisk                 # ATA disk drives
device          ataraid                 # ATA RAID drives
device          atapicd                 # ATAPI CDROM drives
device          atapifd                 # ATAPI floppy drives
device          atapist                 # ATAPI tape drives
options         ATA_STATIC_ID           #Static device numbering

# SCSI Controllers
device          ahb             # EISA AHA1742 family
device          ahc             # AHA2940 and onboard AIC7xxx devices
device          ahd             # AHA39320/29320 and onboard AIC79xx devices
device          amd             # AMD 53C974 (Tekram DC-390(T))
device          isp             # Qlogic family
device          mpt             # LSI-Logic MPT-Fusion
#device         ncr             # NCR/Symbios Logic
device          sym             # NCR/Symbios Logic (newer chipsets + those of `ncr')
device          trm             # Tekram DC395U/UW/F DC315U adapters

device          adv             # Advansys SCSI adapters
device          adw             # Advansys wide SCSI adapters
device          aha             # Adaptec 154x SCSI adapters
device          aic             # Adaptec 15[012]x SCSI adapters, AIC-6[23]60.
device          bt              # Buslogic/Mylex MultiMaster SCSI adapters

device          ncv             # NCR 53C500
device          nsp             # Workbit Ninja SCSI-3
device          stg             # TMC 18C30/18C50

# SCSI peripherals
device  atapicam # ATAPI support for CAM
device          scbus           # SCSI bus (required for SCSI)
device          ch              # SCSI media changers
device          da              # Direct Access (disks)
device          sa              # Sequential Access (tape etc)
device          cd              # CD
device          pass            # Passthrough device (direct SCSI access)
device          ses             # SCSI Environmental Services (and SAF-TE)

# RAID controllers interfaced to the SCSI subsystem
device          amr             # AMI MegaRAID
device          asr             # DPT SmartRAID V, VI and Adaptec SCSI RAID
device          ciss            # Compaq Smart RAID 5*
device          dpt             # DPT Smartcache III, IV - See NOTES for options
device          iir             # Intel Integrated RAID
device          ips             # IBM (Adaptec) ServeRAID
device          mly             # Mylex AcceleRAID/eXtremeRAID

# RAID controllers
device          aac             # Adaptec FSA RAID
device          aacp            # SCSI passthrough for aac (requires CAM)
device          ida             # Compaq Smart RAID
device          mlx             # Mylex DAC960 family
device          pst             # Promise Supertrak SX6000
device          twe             # 3ware ATA RAID

# atkbdc0 controls both the keyboard and the PS/2 mouse
device          atkbdc          # AT keyboard controller
device          atkbd           # AT keyboard
device          psm             # PS/2 mouse

device          vga             # VGA video card driver

device          splash          # Splash screen and screen saver support

# syscons is the default console driver, resembling an SCO console
device          sc

# Enable this for the pcvt (VT220 compatible) console driver
#device         vt
#options        XSERVER                 # support for X server on a vt console
#options        FAT_CURSOR              # start with block cursor

device          agp             # support several AGP chipsets

# Floating point support - do not disable.
device          npx

# Power management support (see NOTES for more options)
#device         apm
# Add suspend/resume support for the i8254.
device          pmtimer

# PCCARD (PCMCIA) support
# Pcmcia and cardbus bridge support
device          cbb                     # cardbus (yenta) bridge
#device         pcic                    # ExCA ISA and PCI bridges
device          pccard                  # PC Card (16-bit) bus
device          cardbus                 # CardBus (32-bit) bus

# Serial (COM) ports
device          sio             # 8250, 16[45]50 based serial ports

# Parallel port
device          ppc
device          ppbus           # Parallel port bus (required)
device          lpt             # Printer
device          plip            # TCP/IP over parallel
device          ppi             # Parallel port interface device
#device         vpo             # Requires scbus and da

# If you've got a "dumb" serial or parallel PCI card that is
# supported by the puc(4) glue driver, uncomment the following
# line to enable it (connects to the sio and/or ppc drivers):
#device         puc

# PCI Ethernet NICs.
device          de              # DEC/Intel DC21x4x (``Tulip'')
device          em              # Intel PRO/1000 adapter Gigabit Ethernet Card
device          txp             # 3Com 3cR990 (``Typhoon'')
device          vx              # 3Com 3c590, 3c595 (``Vortex'')

# PCI Ethernet NICs that use the common MII bus controller code.
# NOTE: Be sure to keep the 'device miibus' line in order to use these NICs!
device          miibus          # MII bus support
device          bfe             # Broadcom BCM440x 10/100 ethernet
device          bge             # Broadcom BCM570xx Gigabit Ethernet
device          dc              # DEC/Intel 21143 and various workalikes
device          fxp             # Intel EtherExpress PRO/100B (82557, 82558)
device          pcn             # AMD Am79C97x PCI 10/100 (precedence over 'lnc')
device          re              # RealTek 8139C+/8169/8169S/8110S
device          rl              # RealTek 8129/8139
device          sf              # Adaptec AIC-6915 (``Starfire'')
device          sis             # Silicon Integrated Systems SiS 900/SiS 7016
device          sk              # SysKonnect SK-984x and SK-982x gigabit ethernet
device          ste             # Sundance ST201 (D-Link DFE-550TX)
device          ti              # Alteon Networks Tigon I/II gigabit ethernet
device          tl              # Texas Instruments ThunderLAN
device          tx              # SMC EtherPower II (83c170 ``EPIC'')
device          vr              # VIA Rhine, Rhine II
device          wb              # Winbond W89C840F
device          xl              # 3Com 3c90x (``Boomerang'', ``Cyclone'')

# ISA Ethernet NICs.  pccard nics included.
device          cs              # Crystal Semiconductor CS89x0 NIC
# 'device ed' requires 'device miibus'
device          ed              # NE[12]000, SMC Ultra, 3c503, DS8390 cards
device          ex              # Intel EtherExpress Pro/10 and Pro/10+
device          ep              # Etherlink III based cards
device          fe              # Fujitsu MB8696x based cards
device          ie              # EtherExpress 8/16, 3C507, StarLAN 10 etc.
device          lnc             # NE2100, NE32-VL Lance Ethernet cards
device          sn              # SMC's 9000 series of ethernet chips
device          xe              # Xircom pccard ethernet

# ISA devices that use the old ISA shims
#device         le

# Wireless NIC cards
device          wlan            # 802.11 support
device          an              # Aironet 4500/4800 802.11 wireless NICs. 
device          awi             # BayStack 660 and others
device          wi              # WaveLAN/Intersil/Symbol 802.11 wireless NICs.
#device         wl              # Older non 802.11 Wavelan wireless NIC.

# Pseudo devices - the number indicates how many units to allocate.
device          random          # Entropy device
device          loop            # Network loopback
device          ether           # Ethernet support
device          sl              # Kernel SLIP
device          ppp             # Kernel PPP
device          tun             # Packet tunnel.
device          pty             # Pseudo-ttys (telnet etc)
device          md              # Memory "disks"
device          gif             # IPv6 and IPv4 tunneling
device          faith           # IPv6-to-IPv4 relaying (translation)

# The `bpf' device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
device          bpf             # Berkeley packet filter

# USB support
device          uhci            # UHCI PCI->USB interface
device          ohci            # OHCI PCI->USB interface
device          usb             # USB Bus (required)
#device         udbp            # USB Double Bulk Pipe devices
device          ugen            # Generic
device          uhid            # "Human Interface Devices"
device          ukbd            # Keyboard
device          ulpt            # Printer
device          umass           # Disks/Mass storage - Requires scbus and da
device          ums             # Mouse
device          urio            # Diamond Rio 500 MP3 player
device          uscanner        # Scanners
# USB Ethernet, requires mii
device          aue             # ADMtek USB ethernet
device          axe             # ASIX Electronics USB ethernet
device          cue             # CATC USB ethernet
device          kue             # Kawasaki LSI USB ethernet

# FireWire support
device          firewire        # FireWire bus code
device          sbp             # SCSI over FireWire (Requires scbus and da)
device          fwe             # Ethernet over FireWire (non-standard!)

# smbus
device          smbus
device          bktr
device          iicbus
device          iicsmb
device          smb
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