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From: j@uriah.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: CDROM changers, etc
Date: 19 Feb 1996 23:31:14 GMT
Organization: Private BSD site, Dresden
Lines: 48
Message-ID: <4gb182$d34@uriah.heep.sax.de>
References: <DMHsAG.IyE@sysadm.physics.uiowa.edu>
Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
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ljg@space.physics.uiowa.edu (Larry Granroth) writes:
> First off, I'm looking for information on using the /dev/ch0 device
> for controlling a Pioneer DRM-1804X CDROM changer. I've found ioctl
> structures in <sys/chio.h>, but was hoping that someone had already
> put together some convenient utilities.
The `ch' driver is for tape changer devices. CDROM changers should be
handled by the regular `cd' driver.
You should get it going well, except that systems up to 2.1R had a
minor bug causing a panic when accessing > 6 drives. Here's the fix
from -current:
Index: /sys/scsi/cd.c
===================================================================
RCS file: /home/cvs/src/sys/scsi/cd.c,v
retrieving revision 1.53
retrieving revision 1.54
diff -u -u -r1.53 -r1.54
--- cd.c 1995/12/14 09:54:18 1.53
+++ cd.c 1995/12/20 12:02:43 1.54
@@ -14,7 +14,7 @@
*
* Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
*
- * $Id: cd.c,v 1.53 1995/12/14 09:54:18 phk Exp $
+ * $Id: cd.c,v 1.54 1995/12/20 12:02:43 dufault Exp $
*/
#define SPLCD splbio
@@ -588,7 +588,7 @@
return;
}
cdqueues++;
- if(cd->dkunit) {
+ if(cd->dkunit >= 0) {
dk_xfer[cd->dkunit]++;
dk_seek[cd->dkunit]++; /* don't know */
dk_wds[cd->dkunit] += bp->b_bcount >> 6;
--
cheers, J"org
joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)