At last, my Adaptec 2940W problem SOLVED!

At last, my Adaptec 2940W problem SOLVED!

Post by Mogens Kjae » Wed, 04 Dec 1996 04:00:00

Ah, at last I got it to work:

I have an IBM 320 server with an adaptec 2940w, 4x2Gb disks and
an IBM CD-ROM. The cdrom identifies itself as CDRM00203.

It worked perfectly with win95. Yes, YES, the termination is

When I installed Linux I ran into 1.0e6 problems with the disks
and the CD-ROM.

I first installed redhat 4.0, kernel 2.0.18, later upgraded to

The problem was, that linux would stop with a lot of scsi resets
when I try to access the CD-ROM. Usually, it would run for a
short time if I used the command:

tar cvf /dev/null /mnt/cdrom

but if I copied the files to the harddisks it would stop immediately,
with a lot of scsi resets.

The solution to the problem was to enter the scsi setup during
boot (with ctrl-A), and disable initiate sync negotiation for
the cdrom drive, and fixing the speed at 5MHz. The disks run at
10 MHz.

This solved the problem, and it now works great.

The question left is of course, why is this necessary? Is this
a problem with the aic7xxx driver that it doesn't know how to
change speed correctly? As I said before, it works under win95,
I could copy files from the CD to the harddisk without any problems.

Mogens Kjaer, Carlsberg Laboratory, Dept. of Chemistry
Gamle Carlsberg Vej 10, DK-2500 Valby, Denmark
Phone: +45 33 27 53 25, Fax: +45 33 27 47 08


1. Adaptec 2940W with SCO v5.0 SOLVED!

A little snip of my original question:
<begin snip>
I have a PCI Pentium 166 machine using a 2940W.
I have a Seagate 1.7Gb Wide Barracuda attached at ID 0, and two Seagate
4Gb Narrow Barracudas attached at ID 1 and ID 2.

During my 'hair pulling', I have loaded Win 95 *with NO problem*
                          I have loaded WinNT 3.51 *with NO problem*
                          I have loaded SCO v4.2 *with NO problem*

When attempting to load SCO v5.0 I get a fatal error called:
"  System Error 6:
   while getting fs type "
<end snip>


My problem <previously reported> was the following:

SCO v5.0 not recognizing the presence of 2940W SCSI Adapter, even tho
            SCO v4.2 did
            Windows 95 did
            WinNT 3.51 did
            DOS did

solution to problem:
            PCI motherboard had PnP -disabled- which did not interfere
            with the loading and functioning of any of the O/S's except
            SCO v5.0. Enabling PnP solved the problem. PLEASE excuse my

I used to pride myself in painstakingly tracking DMA, IRQS & addresses
Plug'n Pray -oops- Plug'n Play is NOT my forte`

  Jim Pazarena                    phone: (604) 559-4444
  Box 550 - 405 2nd Avenue          fax: (604) 559-8404

  CANADA   V0T 1S0                business name: qcislands net

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