Date: Sat, 16 May 1998 12:03:33 -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? Message-ID: <Pine.BSF.3.95.980516120221.16642F-100000@current1.whistle.com> In-Reply-To: <19980516113224.A10553@ct.picker.com>
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I can't remember the major for the ssc device,
but check in /sys/i386/conf/majors.i386
you also have to have it config'd into the kernel.
On Sat, 16 May 1998, Randall Hopper wrote:
> Julian Elischer:
> |Randall Hopper wrote:
> |> SCENARIO 1 : SCANNER OFF, BOOT UP FREEBSD, THEN TURN SCANNER ON
> |> # dmesg | grep uk0
> |> # echo < /dev/uk0
> |> /dev/uk0: Device not configured.
> |> # scsi -f /dev/uk0 -d 255
> |use scsi -f /dev/rsd0 -r
> |
> |remember WHAT scsi device you use is irrelevant. you just need one
> |that IS there.. (any one).
>
> Oh! [light goes on], OK. Thanks. Now I see the disconnect.
>
> Specifying an already-attached device to reprobe another device not yet
> attached seemed so odd it just didn't even register.
>
> I just tried this, and this will work for my situation. I have a ZIP on
> sd0, but unfortunately I have to go dig up a disk to stick in it for "scsi
> -f /dev/rsd0 -r" not to return "Device not configured".
>
> Now that we're on the same page, you may find my trials getting here a bit
> amusing, and possibly could help me with where I've gone wrong trying to
> get -p to work (sounds like that's the best option):
>
> 1. Earlier in the this thread, you mentioned:
>
> |use the scsi -r command. you will need to use it against an already
> |existing device, e.g. /dev/rsd0
> |man 8 scsi
>
> By existing, I thought you meant that the special device file existed
> in /dev). Not that a physical device had been probed and successfully
> attached to the existing device file (and in the ZIPs case, that a
> disk had been loaded).
>
> 2. In scsi(8), it says this "-r" form of scsi isn't needed in FreeBSD >=
> 2.1 since "opening a fixed SCSI device has the side effect of
> reprobing it".
>
> When I reopened the wired-down /dev/uk0, no such reprobe/attach
> seemed to occur -- it was still "Device not configured".
>
> 3. scsi(8) goes on to say in the reprobe paragraph:
>
> and probing with the bus with the -p option should bring on line
> any newly found devices. See scsi(4) for a description of fixed
> scsi devices.
>
> a. (nit) scsi(4) didn't even contain the word fixed.
>
> b. Following up on -p (mentioned above), scsi(8) also goes on to say:
>
> The -p option can be used against the "super scsi" device
> /dev/scsi/super to probe all devices with a given SCSI lun on a
> given SCSI bus. The bus can be selected with the -b option and
> the default is 0. The lun can be selected with the -l option and
> the default is 0. See scsi(4) for a description of the "super
> scsi" device.
>
> c. It sounded like -p was what I wanted. So to try -p, I built a
> kernel with SuperSCSI ("su" & "ssc"), but I couldn't figure out how
> to mknod the "scsi/super" SuperSCSI device. There was no reference
> to it in MAKEDEV.
>
> So I'm not sure how to use -p, or if it still works. Brian Somers
> mentioned it earlier in this thread I noticed, so I assume there's
> "some" way to use it.
>
> |if not try the device ssc (if you configured it in) After that you can
> |use uk..
>
> This sounds like it'd be the best option for me (so I don't have to go find
> a ZIP disk to load into my ZIP drive to be able to use "scsi -r").
>
> So I guess my question here is, what device file path do I specify for the
> "scsi -p" command line?:
>
> # scsi -f /dev/uk0 -p -b 0 -l 6
> scsi: unable to open device /dev/uk0: Device not configured
> # scsi -f /dev/rsd0 -p -b 0 -l 6
> scsi: unable to open device /dev/rsd0: Device not configured
> # cd /dev
> /dev # sh MAKEDEV ssc
> ssc - no such device name
> /dev # sh MAKEDEV scsi/super
> scsi/super - no such device name
> /dev # ls -l ssc* scsi/*
> ls: No match.
>
> Thanks. I appreciate your help!
>
> Randall
>
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