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From: Rudmer van Dijk <rudmer@legolas.dynup.net>
Reply-To: rudmer@legolas.dynup.net
To: Andre Hedrick <andre@linux-ide.org>
Subject: Re: Linux 2.4.20-pre2-ac6
Date: Thu, 22 Aug 2002 17:57:17 +0200
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Cc: Alan Cox <alan@redhat.com>, linux-kernel@vger.kernel.org
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On Thursday 22 August 2002 10:05, Andre Hedrick wrote:
> SWEET, that give me a comparison point to check.
> Please try with DMA off on the burn to isolate if net logic in the changes
> is bad or if it is the DMA engine part.
> 

ok update:

not only is it not possible to burn, reading a cd also fails:
from dmesg:
<snip>
SCSI subsystem driver Revision: 1.00
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
  Vendor: IOMEGA    Model: ZIP 100           Rev: 23.D
  Type:   Direct-Access                      ANSI SCSI revision: 00
  Vendor: HL-DT-ST  Model: CD-RW GCE-8240B   Rev: 1.06
  Type:   CD-ROM                             ANSI SCSI revision: 02
Attached scsi CD-ROM sr0 at scsi0, channel 0, id 1, lun 0
sr0: scsi3-mmc drive: 24x/40x writer cd/rw xa/form2 cdda tray
Uniform CD-ROM driver Revision: 3.12
attempt to access beyond end of device
0b:00: rw=0, want=34, limit=2
isofs_read_super: bread failed, dev=0b:00, iso_blknum=16, block=16
attempt to access beyond end of device
0b:00: rw=0, want=34, limit=2
isofs_read_super: bread failed, dev=0b:00, iso_blknum=16, block=16
attempt to access beyond end of device
0b:00: rw=0, want=34, limit=2
isofs_read_super: bread failed, dev=0b:00, iso_blknum=16, block=16
scsi0: ERROR on channel 0, id 1, lun 0, CDB: 0x03 00 00 00 40 00
Current sd0b:00: sns = 70  3
ASC= 2 ASCQ= 0
Raw sense data:0x70 0x00 0x03 0x00 0x00 0x00 0x00 0x0a 0x00 0x00 0x00 0x00 
0x02
0x00 0x00 0x00 0x00 0x00
 I/O error: dev 0b:00, sector 0

messages show the loading of modules: modprobe sr_mod, modprobe ide-scsi and 
modprobe sg. then I tried 3 times to mount the cd (the 'attempt to access 
beyond end of device' messages) and once to do a `dd if=/dev/sr0 of=test 
bs=1024 count=1` which fails saying:
dd: reading `/dev/sr0': Input/output error
0+0 records in
0+0 records out


hope this helps

	Rudmer
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