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From: epg@cwi.nl (Ed Gronke)
Newsgroups: comp.bugs.4bsd
Subject: problems with the cypher tape drive in 4.3 tahoe beta bsd fixed
Message-ID: <28@piring.cwi.nl>
Date: Wed, 5-Aug-87 08:37:50 EDT
Article-I.D.: piring.28
Posted: Wed Aug  5 08:37:50 1987
Date-Received: Sat, 8-Aug-87 01:04:55 EDT
Organization: CWI, Amsterdam
Lines: 27

Subject: cy.c doesn't properly respond to write "retry unsuccessful" errors
Index: sys tahoe

Description:
	The cy driver, when it gets a retry error while writing (HERR) doesn't
	handle the retry successfully. Currently, it stops with a hard error
	and does not attempt to write a longer inter-record gap and try
	again.
Repeat-By:
	Find a tape with a bad spot. Try writing on it. Notice that it
	will always fail, even though the tape will probably work on
	4.3 systems.
Fix:
	Reclassify the retry error as soft so that the cystart routine will
	write a gap and retry the operation. (Note: line numbers are
	different than the 4.3 tahoe beta distribution)

------- cyreg.h -------
194,195c197,198
<     CYMASK(STROBE)|CYMASK(PROT)|CYMASK(CKSUM)|CYMASK(HERR)|CYMASK(BLANK))
< #define	CYER_SOFT	(CYMASK(FIFO)|CYMASK(NOTRDY)|CYMASK(PARITY))
---
>     CYMASK(STROBE)|CYMASK(PROT)|CYMASK(CKSUM)|CYMASK(BLANK))
> #define	CYER_SOFT	(CYMASK(FIFO)|CYMASK(NOTRDY)|CYMASK(HERR)|CYMASK(PARITY))


-- Ed Gronke (epg@mcvax.cwi.nl)