Date: Thu, 12 Nov 1998 16:00:01 -0800 (PST) From: "Kenneth D. Merry" <ken@plutotech.com> To: freebsd-bugs@FreeBSD.ORG Subject: Re: kern/8671: sd0->da0 change breaks change of media and MSDOS removeable disks (Zip) Message-ID: <199811130000.QAA05119@freefall.freebsd.org>
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The following reply was made to PR kern/8671; it has been noted by GNATS.
From: "Kenneth D. Merry" <ken@plutotech.com>
To: bad@wireless.net
Cc: freebsd-gnats-submit@FreeBSD.ORG
Subject: Re: kern/8671: sd0->da0 change breaks change of media and MSDOS removeable disks (Zip)
Date: Thu, 12 Nov 1998 16:58:42 -0700 (MST)
bad@wireless.net wrote...
> >Description:
> Under 3.0-SNAP-19980821 Zip disks (Parallel port, but using SCSI protocol)
> worked perfectly with the sd0 device driver.
>
> However, in 3.0-RELEASE the major move from sd0 to {cam}/da0 was made,
> and now MSDOS Zip disks cannot be mounted/format, etc.
>
> The only access that works is with FFS Zip's, and ONLY if you boot up with
> the disk inserted. If one mounts and then unmounts the Zip, removes it from
> drive, and plugs in a new zip, the system is incapable of reading the
> new disklabel, and subsequently crashes, with the dump stating it was
> in {cam} at the time of crash.
> >How-To-Repeat:
> Compile custom kernel with ppbus, vpo0, scsi controller, and device da0.
> Boot up with Zip disk in parallel port zip drive, mount, unmount,
> remove Zip, reinsert.. Subsequently watch system panic.
Please send a stack trace from the panic. Without more information, it's
going to be difficult to diagnose your problem.
> >Fix:
> Temporary fix: Make a config option so that one can use the old sd0
> driver with Parallel port Zip disk, until {cam/da0} properly works
> with removeable media.
The da driver does work with removable media. Using the old sd driver with
CAM would be extremely difficult to implement, and would probably not
be a very fruitful endeavor.
Ken
--
Kenneth Merry
ken@plutotech.com
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