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AHA1542CF suddenly stopped working! Help!

daemon@ATHENA.MIT.EDU (Jay Vassos-Libove)
Tue Feb 3 00:56:43 1998

Date: 	Tue, 3 Feb 1998 00:50:07 -0500 (EST)
From: Jay Vassos-Libove <libove@felines.org>
Reply-To: Jay Vassos-Libove <libove@felines.org>
To: redhat-list@redhat.com, linux-scsi@vger.rutgers.edu

I have recently added a Pentium 133 to my (old) collection.  I plugged an
ISA bus Adaptec AHA1542CF in to it, added a couple of drives, and away I
went.  It was working great, until a few hours ago.

I did not do anything to it.  I shut the system down, added some more RAM,
turned it back on, and all was great.  Then I shut it down to take out the
video board so that I could read the chipset numbers off of it, put the
board back in, turned it back on, and since then (despite a dozen power
cycles and board pulls) all I can get it to do is to load the Linux
kernel, and get as far as probing the SCSI bus and it always gets the
error:

scsi : aborting command due to timeout : pid 0, scsi0, channel 0, id 0,
lun 0 Test Unit Ready 00 00 00 00 00

I have removed the second device from the bus (Hitachi DK516C) - no
effect.  I have removed the first device from the bus (Seagate Medalist
Pro ST52160N) - no effect.  I have removed both devices from the bus and
put a different device on the bus as device zero (HP 307M old thing) - no
effect.

Clearly, it isn't the specific device(s) on the bus that is the cause of
this problem.  Software did not change.  The data on the drives is okay --
I moved one of them to another system with a compatible controller
(AHA2842VL) and it mounts happily and is in use presently.

What could have happenned which

- allows the hardware self test, including disk surface verification, to
work find

- allows the SCSI Controller DMA test to run loops and loops without error

+ yet results in the Linux kernel booting only as far as the AHA1542
driver, and then wiping out as described above

+ given that I have not changed anything!

Heelllppppp!!!!!!!!

Thanks ...

Jay Vassos-Libove		libove@felines.org
+1 770 552 0543  home		+1 404 705 2867  work
Roswell, GA 30075 U.S.A.



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