SCSI controller problems

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Hi,

I have a new Fedora installation, and have no access to my
SCSI DAT drive, nor to a SCSI DVD-RAM drive.

I tried two different controllers:

The ASUS PCI-SC200 board, based on the Symbios 53C810 chip,
is listed by Hardware Browser under Unknown Devices.
No connected SCSI devices appear.

dmesg shows:

PCI: fixing NCR 53C810 class code for 03:0c.0
...
sym53c8xx: at PCI bus 3, device 12, function 0
sym53c8xx: not initializing, device not supported
...
sym53c8xx: at PCI bus 3, device 12, function 0
sym53c8xx: not initializing, device not supported



The Kouwell KW-801V75, based on the Symbios 53C875 chip,
is listed properly under SCSI Devices with driver sym53c8xx .
The devices appear correctly under Tape Drives (/dev/st0) and
CD-ROM Drives (/dev/scd1).  But when I try to access them
with mt or mount, I get a 'No such device or address' error.

dmesg (with just the DAT drive connected to the SCSI bus, but
the DVD-RAM connected via IDE, see below) shows:

sym53c8xx: at PCI bus 3, device 12, function 0
sym53c8xx: setting PCI_COMMAND_PARITY...(fix-up)
sym53c8xx: 53c875 detected with Symbios NVRAM
sym53c875-0: rev 0x26 on pci bus 3 device 12 function 0 irq 5
sym53c875-0: Symbios format NVRAM, ID 7, Fast-20, Parity Checking
sym53c875-0: on-chip RAM at 0xfeafd000
sym53c875-0: restart (scsi reset).
sym53c875-0: Downloading SCSI SCRIPTS.
scsi1 : sym53c8xx-1.7.3c-20010512
blk: queue dc299c18, I/O limit 4095Mb (mask 0xffffffff)
  Vendor: SONY      Model: SDT-7000          Rev: T306
  Type:   Sequential-Access                  ANSI SCSI revision: 02
blk: queue dc299a18, I/O limit 4095Mb (mask 0xffffffff)
Attached scsi CD-ROM sr0 at scsi0, channel 0, id 0, lun 0
sr0: scsi3-mmc drive: 32x/32x writer dvd-ram cd/rw xa/form2 cdda tray
st: Version 20030406, bufsize 32768, max init. bufs 4, s/g segs 16
Attached scsi tape st0 at scsi1, channel 0, id 0, lun 0
sym53c875-0-<0,*>: FAST-10 SCSI 10.0 MB/s (100.0 ns, offset 15)
sym53c875-0: detaching ...
sym53c875-0: resetting chip
scsi : 1 host left.



Notes:

I'm using a 3.2 GHz P4 in an ASUS P4C800-E motherboard.

I'm running 2.4.22-1.2197.nptlsmp, but also tried
2.4.22-1.2115.nptl with no change in symptoms.

The DVD-RAM drive, a Matsushita SW-9572, has a native IDE interface,
but was supplied with an IOdata SCSI->IDE adapter.  Fedora can
access the DVD-RAM with no problems, when it is connected directly
to the secondary IDE port on the motherboard.

This system can also be booted to Win XP Pro.

Windows can access the DAT drive with no trouble, using its
native drivers, through either the Asus or the Kouwell
controllers.

Windows can access the DVD-RAM drive with no trouble,
using the driver supplied by Matsushita, through either the
Asus or the Kouwell controllers, or via IDE.

Any suggestions gratefully appreciated.

Thanks,

Stewart







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