From owner-freebsd-questions  Thu May 14 19:31:18 1998
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Date: Thu, 14 May 1998 19:22:15 -0700 (PDT)
From: Julian Elischer <julian@whistle.com>
To: Randall Hopper <rhh@ct.picker.com>
cc: freebsd-questions@FreeBSD.ORG
Subject: Re: Rescanning SCSI-Bus without Rebooting?
In-Reply-To: <19980514220155.B20919@ct.picker.com>
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wire down uk0 then just as you'd wire down sd0
then it'll be there whether or not the device is on.


On Thu, 14 May 1998, Randall Hopper wrote:

> Julian Elischer:
>  |if your scanner is uk0 then it has already been found and no
>  |amount of reprobing will write a driver for it.
> 
> I'm pretty green with SCSI internals so please bear with me :-)
> 
> uk0 (the Microtek E6 SCSI Scanner) is found when I boot with the scanner
> on.  It is "not" found I boot with the scanner off.  
> 
> That's the whole reason I need that unit rescan to work.  I want to avoid
> leaving the scanner on all the time (shortens lamp life), and I'd rather
> not reboot (to configure uk0) everytime I have a need to use it.  I hope
> that makes sense.
> 
>  |uk stands for "unknown"
>  |there is no scanner driver
>  |
>  |did it come up as uk0 in the dmesg?
> 
> Yes, but only when the scanner is on.
> 
>  |if so you ar ewher eyou wnt to be..
>  |if not then do as the example you quote says
>  |AND USE sd0!
> 
> Can I use sd0 (SCSI Disk?) for a SCSI device that reports itself as a
> "Scanner"?
> 
>  |you cannot use uk0 until IT HAS BEEN FOUND
>  |so you need to ask the scsi system via some OTHER scsi device that
>  |actually exists.
> 
> Ok.  So there's something fundamentally different about the uk driver.  I
> assumed (wrongly) that it was a "generic" SCSI driver with a minimal
> implementation that could be treated like any other SCSI device for generic
> SCSI operations.
> 
> So, what device is recommended for use in this case where you want to wire
> a known scanner device down?
> 
> Thanks,
> 
> Randall
> 


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