acd0: TEST_UNIT_READY semaphore timeout !! DANGER Will Robinson

Dear *,

while my slightly out-of-date CURRENT system as of March 5th works fine,
CURRENT as of today won't boot due to problems with the ATA CD ROM. Tray
is closed, no CD inserted, in case it matters. The timeout message is
displayed several times with about 20 secs in between, after

...
ad0: 76319MB <ST380023A/3.33> [155061/16/63] at ata0-master UDMA100
acd0: DVDR <NEC DVD RW ND-2500A/1.06> at ata1-master UDMA33
acd0: req=0xmumble TEST_UNIT_READY semaphore timeout !! DANGER Will Robinson

I have used the GENERIC device hints. The older system continues after
acd0: DVDR ... with the SCSI disks,
da0 at ahd0 bus 0 target 0 lun 0
da0: <FUJITSU MAN3367MP 0108> Fixed Direct Access SCSI-3 device 
da0: 160.000MB/s transfers (80.000MHz, offset 127, 16bit), Tagged Queueing Enabl
ed
da0: 35044MB (71771688 512 byte sectors: 255H 63S/T 4467C)

Mainboard is a Supermicro P4SCT. The complete dmesg of the working
system is below. Is there anything I can do to help fix this? I could
try compiling older systems and find out the date it broke if this is
deemed reasonable by the experts.

Regards,

	Jens
-- 
Jens Schweikhardt http://www.schweikhardt.net/
SIGSIG -- signature too long (core dumped)



Copyright (c) 1992-2005 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 6.0-CURRENT #0: Sat Mar  5 15:13:14 CET 2005
    toor_at_hal9000.schweikhardt.net:/share/HEAD/obj/share/HEAD/src/sys/HAL9000
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (2994.90-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf33  Stepping = 3
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Hyperthreading: 2 logical CPUs
real memory  = 1072627712 (1022 MB)
avail memory = 1040850944 (992 MB)
MPTable: <OEM00000 PROD00000000>
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
ioapic0: Changing APIC ID to 2
ioapic0: Assuming intbase of 0
ioapic1: Assuming intbase of 24
ioapic0 <Version 2.0> irqs 0-23 on motherboard
ioapic1 <Version 2.0> irqs 24-47 on motherboard
bktr_mem: memory holder loaded
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
cpu0 on motherboard
cpu1 on motherboard
pcib0: <MPTable Host-PCI bridge> pcibus 0 on motherboard
pci0: <PCI bus> on pcib0
pcib1: <MPTable PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pci1: <display, VGA> at device 0.0 (no driver attached)
pci1: <display> at device 0.1 (no driver attached)
pcib2: <MPTable PCI-PCI bridge> at device 3.0 on pci0
pci2: <PCI bus> on pcib2
em0: <Intel(R) PRO/1000 Network Connection, Version - 1.7.35> port 0xb000-0xb01f mem 0xec000000-0xec01ffff irq 18 at device 1.0 on pci2
em0: Ethernet address: 00:30:48:80:79:71
em0:  Speed:N/A  Duplex:N/A
pcib3: <MPTable PCI-PCI bridge> at device 28.0 on pci0
pci3: <PCI bus> on pcib3
ahd0: <Adaptec 29320LP Ultra320 SCSI adapter> port 0xc400-0xc4ff,0xc000-0xc0ff mem 0xeb000000-0xeb001fff irq 24 at device 1.0 on pci3
ahd0: [GIANT-LOCKED]
aic7901A: Ultra320 Wide Channel A, SCSI Id=7, PCI 33 or 66Mhz, 512 SCBs
ahc0: <Adaptec 29160 Ultra160 SCSI adapter> port 0xc800-0xc8ff mem 0xeb002000-0xeb002fff irq 25 at device 2.0 on pci3
ahc0: [GIANT-LOCKED]
aic7892: Ultra160 Wide Channel A, SCSI Id=7, 32/253 SCBs
uhci0: <UHCI (generic) USB controller> port 0xd000-0xd01f irq 16 at device 29.0 on pci0
uhci0: [GIANT-LOCKED]
usb0: <UHCI (generic) USB controller> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1: <UHCI (generic) USB controller> port 0xd400-0xd41f irq 19 at device 29.1 on pci0
uhci1: [GIANT-LOCKED]
usb1: <UHCI (generic) USB controller> on uhci1
usb1: USB revision 1.0
uhub1: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
pci0: <base peripheral> at device 29.4 (no driver attached)
pci0: <base peripheral, interrupt controller> at device 29.5 (no driver attached)
pci0: <serial bus, USB> at device 29.7 (no driver attached)
pcib4: <MPTable PCI-PCI bridge> at device 30.0 on pci0
pci4: <PCI bus> on pcib4
bktr0: <BrookTree 878> mem 0xec300000-0xec300fff irq 20 at device 1.0 on pci4
bktr0: [GIANT-LOCKED]
bktr0: Hauppauge Model 38104 B208
bktr0: Hauppauge WinCast/TV, Philips PAL I tuner.
pci4: <multimedia> at device 1.1 (no driver attached)
csa0: <CS4280/CS4614/CS4622/CS4624/CS4630> mem 0xec100000-0xec1fffff,0xec200000-0xec200fff irq 21 at device 2.0 on pci4
csa: card is Unknown/invalid SSID (CS4614)
csa0: [GIANT-LOCKED]
pcm0: <CS461x PCM Audio> on csa0
pcm0: <Cirrus Logic CS4294 AC97 Codec>
pcm0: [GIANT-LOCKED]
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel 6300ESB UDMA100 controller> port 0xf000-0xf00f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 31.1 on pci0
ata0: channel #0 on atapci0
ata1: channel #1 on atapci0
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
orm0: <ISA Option ROM> at iomem 0xc0000-0xccfff on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x64,0x60 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: model IntelliMouse, device ID 3
fdc0: <Enhanced floppy controller> at port 0x3f0-0x3f5 irq 6 drq 2 on isa0
fdc0: [FAST]
ppc0: <Parallel port> at port 0x278-0x27f irq 7 on isa0
ppc0: Generic chipset (NIBBLE-only) in COMPATIBLE mode
ppbus0: <Parallel port bus> on ppc0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
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: <PNP0c01> can't assign resources (memory)
unknown: <PNP0f13> can't assign resources (irq)
unknown: <PNP0501> can't assign resources (port)
unknown: <PNP0700> can't assign resources (port)
unknown: <PNP0400> can't assign resources (port)
unknown: <PNP0501> can't assign resources (port)
Timecounters tick every 1.000 msec
ipfw2 initialized, divert loadable, rule-based forwarding disabled, default to deny, logging limited to 100 packets/entry by default
ad0: 76319MB <ST380023A/3.33> [155061/16/63] at ata0-master UDMA100
acd0: DVDR <NEC DVD RW ND-2500A/1.06> at ata1-master UDMA33
da0 at ahd0 bus 0 target 0 lun 0
da0: <FUJITSU MAN3367MP 0108> Fixed Direct Access SCSI-3 device 
da0: 160.000MB/s transfers (80.000MHz, offset 127, 16bit), Tagged Queueing Enabled
da0: 35044MB (71771688 512 byte sectors: 255H 63S/T 4467C)
da1 at ahd0 bus 0 target 1 lun 0
da1: <FUJITSU MAN3367MP 0108> Fixed Direct Access SCSI-3 device 
da1: 160.000MB/s transfers (80.000MHz, offset 127, 16bit), Tagged Queueing Enabled
da1: 35044MB (71771688 512 byte sectors: 255H 63S/T 4467C)
da2 at ahd0 bus 0 target 5 lun 0
da2: <FUJITSU MAP3367NP 0108> Fixed Direct Access SCSI-3 device 
da2: 320.000MB/s transfers (160.000MHz, offset 127, 16bit), Tagged Queueing Enabled
da2: 35046MB (71775284 512 byte sectors: 255H 63S/T 4467C)
da3 at ahd0 bus 0 target 6 lun 0
da3: <FUJITSU MAP3367NP 0108> Fixed Direct Access SCSI-3 device 
da3: 320.000MB/s transfers (160.000MHz, offset 127, 16bit), Tagged Queueing Enabled
da3: 35046MB (71775284 512 byte sectors: 255H 63S/T 4467C)
SMP: AP CPU #1 Launched!
cd0 at ata1 bus 0 target 0 lun 0
cd0: <_NEC DVD_RW ND-2500A 1.06> Removable CD-ROM SCSI-0 device 
cd0: 33.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present
Trying to mount root from ufs:/dev/da0s1a