RE: Sane / Scanner problem

[mheyes@lincolnfp.com]

The scanner (HP 4c) id was set to "2". When I booted with the scanner off, and
entered the "echo" line you suggested, the scanner mounted and I was able to
access it.  Hmmm.  My lilo.conf forced recognition with
"append=aha152x=0x140,9,2" so I tried changing the scsi id from 2 to 3 in the
append line and rebooted. The scanner was detected fine, and only at scsi id 2.
Dmesg showed  "scsi generic sga at scsi0, channel 0, id 2, lun 0".

It works, I'm happy, but I don't understand the behavior. Any ideas?



Michael Heyes






"Ingles, Raymond" <Ray.Ingles@fanucrobotics.com> on 11/17/99 11:19:26 AM

To:   Mike Heyes/LincolnFP/BerisfordPlc@BerisfordPlc
cc:

Subject:  RE: Sane / Scanner problem




> From: mheyes@lincolnfp.com [mailto:mheyes@lincolnfp.com]

> When I boot, though, I get the scanner detection message, but
> I get messages detecting generic sga at scsi id 0, generic sgb
> at scsi id 1 ---generic sgf at scsi id 7.

 Are you positive the scanner's ID is 2? If it's set to the same ID
as the SCSI card (usually 7), you can see that behavior.

 Also, some broken SCSI hardware doesn't autodetect well. SCSI allows
for an ID and a "LUN", logical unit number. This allows a SCSI device
to have sub-devices; for example, a CD changer will have each CD slot
on a seperate LUN. Some hardware only checks the ID, and responds to
multiple LUNs.

 There may be a way for the 152x driver to "not probe all LUNs" or
something like that.

 Finally, if nothing else works, there's a way to add a specific SCSI
device after the kernel is booted or the module is loaded. The command is

echo "scsi add-single-device w x y z" >/proc/scsi/scsi

 (which must be done as root), where "w" = scsi host #, x = channel
number (some SCSI cards have multiple channels), y = ID, z = LUN.

 So, in your case, you'd boot with the scanner turned off. Then, turn
on the scanner, and do...

echo "scsi add-single-device 0 0 2 0" >/proc/scsi/scsi

 (I'm assuming the 152x is the only SCSI card.)

 Sincerely,

 Ray Ingles        (248) 377-7735          ray.ingles@fanucrobotics.com

    "Windows 2000... will have lots of stuff you used to pay extra
     for but is now built in for free, although none of it works."
                        - Eric Lundquist