[sane-devel] AT3 Weirdness
Douglas Gilbert
dgilbert at interlog.com
Thu Mar 28 01:54:23 GMT 2002
abel deuring wrote:
> "Michael S. Moulton" wrote:
>
>>I just got an Artec AT3 from a friend this weekend... I'm using the ISA SCSI card that came with it.
>>
>>I've got it working in both Windows and Linux, so I know everything works ok, but I am getting some weird behavior.
>>
>>Loading the module with:
>>modprobe g_NCR5380 dtc_3181e=1 ncr_addr=0x240
>>seems to only detect the scanner if the scanner is on and ready when I load the module. Once the module is loaded, if I turn the scanner on it is not detected.
>>
>>Do I need to just load the module whenever I need the scanner and unload it when I'm done, or am I missing something?
>>
>
> Michael,
>
> the adapter driver scans the SCSI bus for available devices, when it is
> loaded. If the scanner is powered on later, it will not be "visible".
> The sane-scsi man page has a hint what you can do in this case:
>
> A common issue with SCSI scanners is what to do when you
> booted the system while the scanner was turned off? In
> such a case, the scanner won't be recognized by the kernel
> and SANE won't be able to access it. Fortunately, Linux
> provides a simple mechanism to probe a SCSI device on
> demand. Suppose you have a scanner connected to SCSI bus
> 2 and the scanner has a SCSI id of 5. When the system is
> up and running and the scanner is turned on, you can issue
> the command:
>
> echo "scsi add-single-device 2 0 5 0" >
> /proc/scsi/scsi
>
> and the kernel will probe and recognize your scanner (this
> needs to be done as root). It's also possible to dynami
> cally remove a SCSI device by using the ``remove-single-
> device'' command. For details, please refer to to the
> SCSI-Programming-HOWTO.
Abel,
A note about "SCSI-Programming-HOWTO": it is now archived and
classified as "unsupported" by linuxdoc.org [and this is with
the agreement of its author]. The appropriate reference for
"add-single-device" is the SCSI-2.4-HOWTO . For in depth
information about the linux sg driver see the SCSI-Generic-HOWTO.
However I feel the latter document is overkill in the above
context.
Please send any corrections and suggestions concerning these
documents to me.
Doug Gilbert
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