Date: Fri, 1 Nov 1996 05:28:54 -0500 (EST) From: Peter Dufault <dufault@hda.com> To: jkh@time.cdrom.com (Jordan K. Hubbard) Cc: joerg_wunsch@uriah.heep.sax.de, freebsd-hackers@FreeBSD.org, jlk@pavilion.co.uk Subject: Re: probing scsi bus after boot? Message-ID: <199611011028.FAA07666@hda.hda.com> In-Reply-To: <6089.846795037@time.cdrom.com> from "Jordan K. Hubbard" at "Oct 31, 96 12:50:37 pm"
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> Huh? I just do this on /dev/sd0 or some other - it works great!
> I use it to detect my scanner after power-up all the time.
The super SCSI device is needed when nothing is on the bus at boot
- you then need a way into the system for that case. Try putting
your scanner on its own bus with no SCSI devices (I forgot - you
NEVER have a system with no SCSI devices). The super SCSI device
should support bus configuration (such as reprobe) and "device
target" types of calls ("become this SCSI NEXUS"). It is essentially
a SCSI bus device.
I added it when I was doing some work with a prototype device on
a dedicated bus that was frequently not powered up.
IMHO super SCSI should be left working this way, maybe renamed to
be a bus device. The SCSI user code should be ripped out with
extreme prejudice - it is superceded by the newer configuration
code.
The code suffers from no use and no test.
Peter
--
Peter Dufault Real-Time Machine Control and Simulation
HD Associates, Inc. Voice: 508 433 6936
dufault@hda.com Fax: 508 433 5267
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