atapicam problem (again): hang on boot with DVD burner

[Malcolm Kay]

On Tue, 7 Feb 2006 09:29 am, Sergey Lungu wrote:
> Hi!
>
> I'm not burning DVDs frequently, so I haven't seen this
> problem before. I have burned a DVD with growisofs and after
> that I am seeing a 3-5 min hang at boot time. No error
> messages at all, just hang :)
>
> Here is what I have:
>
> 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 6.1-PRERELEASE #0: Fri Feb  3
> 11:35:18 MSK 2006
> keyer at ogre.obchaga.org:/usr/obj/usr/src/sys/OGRE
> ACPI APIC Table: <A M I  OEMAPIC >
> Timecounter "i8254" frequency 1193182 Hz quality 0
> CPU: Intel(R) Pentium(R) 4 CPU 2.40GHz (2405.47-MHz 686-class
> CPU) Origin = "GenuineIntel"  Id = 0xf41  Stepping = 1
>
> [...]
>
> acd0: DMA limited to UDMA33, controller found non-ATA66 cable
> acd0: DVDR <PIONEER DVD-RW DVR-110D/1.08> at ata1-master
> UDMA33 cd0 at ata1 bus 0 target 0 lun 0
> cd0: <PIONEER DVD-RW  DVR-110D 1.08> Removable CD-ROM SCSI-0
> device cd0: 33.000MB/s transfers
> cd0: Attempt to query device size failed: NOT READY, Medium
> not present
>
In my limited experience of hanging on boot up the delay has been 
caused by the next, not yet announced activity (possibly not a 
very useful comment).

Malcolm

> [3-5 min hang goes here]
>
> Trying to mount root from ufs:/dev/ad0s2a
>
> The most interesting thing is that I had no such problem
> before using my DVD burner!
>
> Is there a way to fix it?