From owner-freebsd-hackers  Mon Feb  9 18:44:51 1998
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To: kmitch@cslab.vt.edu
cc: hackers@FreeBSD.ORG
Subject: Re: Zip/CD and Stable/Current 
In-reply-to: Your message of "Mon, 09 Feb 1998 08:58:04 EST."
             <199802091358.IAA14080@labrador.cslab.vt.edu> 
Date: Tue, 10 Feb 1998 11:44:22 +0900
From: Satoh Junichi <junichi@astec.co.jp>
Sender: owner-freebsd-hackers@FreeBSD.ORG
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X-Loop: FreeBSD.ORG

> The PC itself is a Gateway model 3110 which is a Pentium II 233 machine
> with both a zip and a CDrom drive on the secondary IDE channel.  If I
> disable the secondary IDE channel, then it will boot.  2.2.5 boots fine, but
> tries to put the zip drive on the CD driver and the end result is both
> the zip and the cdrom drive are inaccessible.
> 
> It appears that something has changed in the IDE stuff that could be
> responsible for this lockup.  Has anyone else seen this??

The ZIP drive reports AT_TYPE_DIRECT.
On FreeBSD 2.2.5R, wcdattach() is called when a AT_TYPE_DIRECT device is
found. If wcdattach() proves the ZIP drive, it may freeze.

To avoid it, there are two solutions.

1. Use wfd driver in RELENG_2_2 branch that supports ATAPI LS-120 and
   ZIP drives.

2. Append 'break' to atapi.c like this. 
   (if you don't use the ZIP drive and your CD-ROM drive reports
    AT_TYPE_CDROM.)
== atapi.c ==========================================================
        switch (ap->devtype) {
        default:
                /* unknown ATAPI device */
                printf ("wdc%d: unit %d: unknown ATAPI type=%d\n",
                        ctlr, unit, ap->devtype);
                break;

        case AT_TYPE_DIRECT:            /* direct-access */
		break; <---- !!! NOTICE !!!
        case AT_TYPE_CDROM:             /* CD-ROM device */
#if NWCD > 0
                /* ATAPI CD-ROM */
                if (wcdattach (ata, unit, ap, ata->debug) < 0)
======================================================================

---
Junichi

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