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Date: Mon, 14 Oct 1996 17:22:33 +0200
From: se@zpr.uni-koeln.de (Stefan Esser)
To: elrond@imladris.frmug.fr.net (Bertrand Petit)
Cc: freebsd-scsi@freebsd.org
Subject: Re: Success report: NOMAI MCD540
In-Reply-To: <199610120646.IAA02796@imladris.frmug.fr.net>; from Bertrand Petit on Oct 12, 1996 08:46:42 +0200
References: <199610120646.IAA02796@imladris.frmug.fr.net>
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Bertrand Petit writes:
> 
> 	I sucessfuly hooked a NOMAI MCD540 removable disk unit to a
> FreeBSD 2.1.0-RELEASE system.
> 
> 	I got some troubles to make it work, I got tons of bus resets
> and NCR crashes likes this:
> 
> sd5(ncr0:5:0): FAST SCSI-2 100ns (10 Mb/sec) offset 8.
> ncr0:5: ERROR (80:100) (8-2a-0) (8/13) @ (544:900b0000).
>    script cmd = 910a0000
>    reg:     da 10 80 13 47 08 05 1f 01 08 05 2a 80 00 02 00.
> ncr0: handshake timeout
> sd5(ncr0:5:0): COMMAND FAILED (6 ff) @f0c04c00.

Everything is fine, except for the handshake timeout.
Your device seems to be very slow at times (for example
when loading a new medium ?) and just blocks operations
on the SCSI bus for a significant time.

This was considered a device failure in 2.1R, but it
was later found, that there are in fact some CD-ROM
changers, CD-R drives or SCSI scanners, which may do
this as part of their normal operation.

The handshake timeout has been removed from the driver
for this reason.

Apply the following patch, if you ever again have a 
problem with your device causing handshake timeouts:

Index: /sys/pci/ncr.c
===================================================================
RCS file: /usr/cvs/src/sys/pci/ncr.c,v
retrieving revision 1.57
retrieving revision 1.58
diff -C2 -r1.57 -r1.58
*** ncr.c	1996/01/15 00:10:15	1.57
--- ncr.c	1996/01/15 23:16:39	1.58
***************
*** 4427,4431 ****
  	OUTB (nc_stest2, EXT    );	/*  Extended Sreq/Sack filtering     */
  	OUTB (nc_stest3, TE     );	/*  TolerANT enable		     */
! 	OUTB (nc_stime0, 0xfb	);	/*  HTH = 1.6sec  STO = 0.1 sec.     */
  
  	/*
--- 4427,4431 ----
  	OUTB (nc_stest2, EXT    );	/*  Extended Sreq/Sack filtering     */
  	OUTB (nc_stest3, TE     );	/*  TolerANT enable		     */
! 	OUTB (nc_stime0, 0x0b	);	/*  HTH = disabled, STO = 0.1 sec.   */
  
  	/*

> 	It was solved by a main board BIOS update on an Asus
> P/I-55TP4XE with an Asus PCI-SCSI2000 adaptater. The last version of
> the BIOS available from the Asus ftp site or mirrors, in the file
> TCX5I020.ZIP.

Regards, STefan