Using a Firewire HD with YDL 3.0.1

Sun Dec 14 23:28:02 2003

On Sun, Dec 14, 2003 at 08:26:11PM -0800, Rich Simpson wrote:
> I tried to make my firewire drive work with YDL I loaded the ohci1394 
> and sbp2 modules as stated in the faq, now I can not find which device 
> my drive is assinged to
> 
> plist -l /dev/sda give the following output
> 
> pdisk: can't open file '/dev/sda' (no such device or address)
> 
> I tried all the devices that I thought it could be, to no avail, where 
> should I look next?

Your problem is that, with a 2.4 kernel, the change of the devices in
the SCSI bus due to hotplugging of firewire (and to a lesser extent
USB) devices is not well handled.  In effect you need to get the SCSI
device list rescanned using rescan-scsi-bus.sh a shell script
available from

          http://www.garloff.de/kurt/linux/scsidev/

or other locations.  There are a number of posts in the archive that
discuss this which you can find with a google search.  However, to
illustrate: 

If I plug in a firewire drive then dmesg shows something like:

scsi1 : SCSI emulation for IEEE-1394 SBP-2 Devices
blk: queue d69fea14, I/O limit 4095Mb (mask 0xffffffff)
ieee1394: sbp2: Logged into SBP-2 device
ieee1394: sbp2: Node 0-00:1023: Max speed [S400] - Max payload [2048]
ieee1394: Node added: ID:BUS[0-00:1023]  GUID[0030e000000002f0]

but I have no SCSI device in the list:

[~] cat /proc/scsi/scsi 
Attached devices: none

Now if I run the rescan-scsi-bus.sh script then:

[~] sudo sh ~/bin/rescan-scsi-bus.sh 
Password:
Host adapter 0 (ide-scsi) found.
Host adapter 1 (sbp2_0) found.
Scanning for device 1 0 0 0 ...
NEW: Host: scsi1 Channel: 00 Id: 00 Lun: 00
      Vendor: IC25N030 Model: ATCS04-0         Rev:     
      Type:   Direct-Access                    ANSI SCSI revision: 06
1 new device(s) found.               
0 device(s) removed. 

and 

[~] cat /proc/scsi/scsi
Attached devices: 
Host: scsi1 Channel: 00 Id: 00 Lun: 00
  Vendor: IC25N030 Model: ATCS04-0         Rev:     
  Type:   Direct-Access                    ANSI SCSI revision: 06

while dmesg now gives:

  Vendor: IC25N030  Model: ATCS04-0          Rev:     
  Type:   Direct-Access                      ANSI SCSI revision: 06
blk: queue c9cf5e14, I/O limit 4095Mb (mask 0xffffffff)
Attached scsi disk sda at scsi1, channel 0, id 0, lun 0
SCSI device sda: 58605120 512-byte hdwr sectors (30006 MB)
 sda: [mac] sda1 sda2 sda3 sda4 sda5 sda6 sda7 sda8 sda9 sda10

So I can mount the device at /dev/sda or use pdisk to examine the
device.  For my drive the command `sudo mount -t ext3 /dev/sda10 /mnt/fw'
will mount the linux partition to the mount point /mnt/fw which I
created for this purpose.

I understand that this process won't be required with the 2.6 series
kernel when they are released.

-- 
Stephen Harker                           Stephen.Harker@spme.monash.edu.au
School of Physics & Materials Engineering
Monash University                       http://www.ph.adfa.edu.au/s-harker/
                                 Baloney Baffles brains: Eric Frank Russell