[8303] in linux-scsi channel archive
Re: SYNC madness - is it Tekram (SYMBIOS) or Tandberg?
daemon@ATHENA.MIT.EDU (Kurt Garloff)
Mon Mar 6 14:24:39 2000
Date: Mon, 6 Mar 2000 18:59:10 +0100
From: Kurt Garloff <garloff@suse.de>
To: linux-scsi@vger.rutgers.edu
Cc: Gerard Roudier <groudier@club-internet.fr>
Message-ID: <20000306185910.F2966@mobil.tue.nl>
Mail-Followup-To: linux-scsi@vger.rutgers.edu,
Gerard Roudier <groudier@club-internet.fr>
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In-Reply-To: <m3hfeki8k3.fsf@emma1.emma.line.org>; from ma@dt.e-technik.uni-dortmund.de on Mon, Mar 06, 2000 at 01:31:40PM +0100
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On Mon, Mar 06, 2000 at 01:31:40PM +0100, Matthias Andree wrote:
> short: Tandberg TDC4222 does not do sync transfers on Tekram DC-390U
> (SYM53C875)
>=20
>=20
>=20
> setup:=20
> Linux 2.2.14 (openwall, reiserfs, current ide driver patches)
>=20
> Host: scsi0 Channel: 00 Id: 04 Lun: 00
> Vendor: HP Model: HP35480A Rev: 1209
> Type: Sequential-Access ANSI SCSI revision: 02
> Host: scsi0 Channel: 00 Id: 06 Lun: 00
> Vendor: TANDBERG Model: TDC 4222 Rev: =3D07:
> Type: Sequential-Access ANSI SCSI revision: 02
>=20
> problem:
>=20
> Now, during the BIOS bus scan, the Tekram reports the Tandberg tape
> drive as offset 8 Byte/Handshake, 4 MXfers/s synchronous, in conformance
> with the Tandberg documentation. Loading the st module (2.2.14)=20
> sym53c875-0-<4,*>: FAST-5 SCSI 5.0 MB/s (200 ns, offset 8)
> sym53c875-0-<6,*>: target did not report SYNC.
G=E9rard has to help you. I don't know about a bug in the DC390 BIOS
misreporting speeds. The reason for the message, that your target does not
report sync might be:
* The device is buggy and does not answer with a corrected SDTR message, but
refuses it, if more than 4MB/s are suggested by the initiator.
* The driver does not support sync speeds below 5MHz, as they don't make
sense anyway. With async. transfers, you can get 5MB/s (and a little bit
more, if your driver uses aggressive timing).
Regards,
--=20
Kurt Garloff <garloff@suse.de> Eindhoven, NL
GPG key: See mail header, key servers Linux kernel development
SuSE GmbH, Nuernberg, FRG SCSI, Security
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