Re: 5.2-RELEASE: unable to mount cd-roms

On Tue, 13 Jan 2004, Jon Noack wrote:

> I am unable to mount CD-ROMs with 5.2-RELEASE.  I get the following
> error message:
>
> cd9660: /dev/acd0: Input/output error

handy.

> The full dmesg:
> http://www.noacks.org/freebsd/dmesg.20040113.txt
>
> $ grep acd0: dmesg.20040113.txt
> acd0: FAILURE - MODE_SENSE_BIG status=51<READY,DSC,ERROR>
> sensekey=ABORTED COMMAND error=4<ABORTED>
> acd0: FAILURE - MODE_SENSE_BIG status=51<READY,DSC,ERROR>
> sensekey=ABORTED COMMAND error=4<ABORTED>
> acd0: <CREATIVEDVD-ROM DVD2240E 03/18/98/1.8A> DVDROM drive at ata0 as
> master
> acd0: read 16007KB/s (32015KB/s), 2KB buffer, WDMA2
> acd0: Reads: CDR, CDRW, CDDA, DVDROM, packet
> acd0: Writes:
> acd0: Audio: play, 65280 volume levels
> acd0: Mechanism: ejectable tray, unlocked
> acd0: Medium: CD-ROM 120mm photo disc
> acd0: WARNING - READ_BIG UDMA ICRC error (retrying request)
> acd0: FAILURE - READ_BIG status=51<READY,DSC,ERROR> sensekey=ILLEGAL
> REQUEST error=0

The UDMA error is telling -- I think you may have a bad cable.  Try
running this command in loader before starting the kernel:

set hw.ata.atapi_dma=0

(or at least check that you aren't setting it to 1 in /boot/loader.conf)

If that fixes it, then something is corrupting DMA transactions to your
DVD drive.  Check the cabling, try rearranging your ATA chains so it isn't
a master device, etc.

-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite_at_gumbysoft.com          |  www.FreeBSD.org