Booting from an external CD-ROM drive on ann Ultra 60 (hooked up
directly to the rear on-board 68-pin Ultra Fast/Wide SCSI port)
Booting from an external Cdrom drive on an Ultra 60 (connected directly to the rear 
on-board 68-pin ultra Fast/Wide SCSI port) may cause the following error:

	ok boot cdrom
	Boot device: /pci@1f,4000/scsi@3/disk@6,0:f         
	Drive not ready
	Can't read disk label
	Can't open disk label package

	Can't open boot device      

An Ultra 60 may come shipped with an internal CD-ROM drive.

Part Number : X6161A OR X6166A
Capacity    : 644MB                    
Type        : CD-ROM
Media       : SunCD 12 OR SunCD 32
Product     : Ultra 1/Ultra 30, 60 - Internal Expansion
              (Cable In System)

However this is NOT always the case.

You can verify this by physically inspecting the front
panel for a cdrom drive and running the probe-scsi or probe-scsi-all
at the "ok prompt" also known as the OBP (open Boot Prom) level. 
Like so,

ok setenv auto-boot? false
ok reset 

Screen will blank and after a couple of seconds you will get the "ok
prompt" back.

ok probe-scsi

Results will be:
Target 0 
Unit 0 Disk QUANTUM VK4550J SUN4.2G8817
Target 6  
Unit 0 Removable Read Only device TOSHIBA 2395 XM5701TASUN12XCD 

OR:

ok probe-scsi-all

Results will be:
/pci@1f,4000/scsi@3,1

NOTE: A blank line or no targets listed indicates, that there
      is nothing attached to the on-board scsi port.
      
/pci@1f,4000/scsi@3
Target 0 
Unit 0 Disk QUANTUM VK4550J SUN4.2G8817
Target 6  
Unit 0 Removable Read Only device TOSHIBA 2395 XM5701TASUN12XCD 


NOTE: On the Ultra 60, the probe-scsi command will ONLY identify
      your internal scsi devices and NOT any other scsi devices
      attached to your on-board scsi port (at the rear of the machine). 
      You will need to run the probe-scsi-all command to identify any 
      other scsi devices attached to your on-board scsi port and/or 
      other scsi controllers/cards (an example would be the Dual Single-Ended
      Ultra/Wide SCSI PCI host adapter). The design on the Ultra 60 
      now treats the on-board scsi port as a separate controller 
      in itself thereby increasing throughput on the bus or host 
      bus adapter. Unlike other SPARC or Ultra machines which still
      treats on-board scsi devices as part of the internal devices thus
      allowing probe-scsi to see these devices as well. 
      

Internal scsi devices use this device path for it's controller:
/pci@1f,4000/scsi@3
On-board scsi devices hooked up directly to the rear on-board 
68-pin Ultra Fast/Wide SCSI port use this device path for it's 
controller:
/pci@1f,4000/scsi@3,1

You will also notice that the "cdrom" alias at the OBP level
has a device path of /pci@1f,4000/scsi@3 which is INTERNAL.
Like so,

ok devalias

Results will be:
cdrom /pci@1f,4000/scsi@3,/disk@6,0:f
(other aliases will also be listed)...

If you were to boot from an external cdrom drive on the Ultra 60 
hooked up directly to the rear on-board 68-pin Ultra Fast/Wide SCSI port,
you may get the following error when doing a boot cdrom at the "ok prompt":

ok boot cdrom

Results will be:
Boot device: /pci@1f,4000/scsi@3/disk@6,0:f         
Drive not ready
Can't read disk label
Can't open disk label package

Can't open boot device


This is what you need to do:
[1.] Be sure that you do NOT have an internal cdrom set to Target 6
     that may conflict and affect the booting from an external cdrom
     drive. Again you can verify this by running the probe-scsi or
     probe-scsi-all command at the ok prompt.
[2.] "Permanent" fix:
     Create another alias called "cdrom1" to boot from the correct path
     for an external cdrom drive.
     
     ok show-disks
     
     Results will be:
     a) /pci@1f,4000/scsi@3,1/disk
     b) /pci@1f,4000/scsi@3/disk
     c) /pci@1f,4000/ebus@1/fdthree@14,3023f0
     q) NO SELECTION
     Enter Selection, q to Quit:     
     
     Choose "a" for selection.
  
     Results will be:
     /pci@1f,4000/scsi@3,1/disk has been selected.
     Type ^Y ( Control-Y ) to insert it in the command line.
     e.g. ok nvalias mydev ^Y
             for creating devalias mydev for 
     /pci@1f,4000/scsi@3,1/disk
             
     At the ok prompt, type "nvalias cdrom1" (without the double quotes)
     then give one space by hitting the [SPACE] bar and hit "Control" and 
     "Y" keys like so,
     
     ok nvalias cdrom1 ^Y
     
     Results will be:
     ok nvalias cdrom1 /pci@1f,4000/scsi@3,1/disk
     
     Now just add the following "@6,0:f" to the end of this line
     (without the double quotes) before hitting [RETURN].
     
     Results will be:
     ok nvalias cdrom1 /pci@1f,4000/scsi@3,1/disk@6,0:f
     ok
     
     Verify that the alias was properly created via the devalias
     command.
     
     ok devalias
     
     Results will be:
     cdrom1 /pci@1f,4000/scsi@3,1/disk@6,0:f
     cdrom /pci@1f,4000/scsi@3,/disk@6,0:f
     all other aliases will also be listed...

     To store the new alias into nvram.
     
     ok nvstore
     
     Now boot from this alias.
     
     ok boot cdrom1
     
[3.] "Temporary" fix.
     Boot from actual device path for the external cdrom drive.     
     
     METHOD 1:
     ---------
     ok show-disks
     
     Results will be:
     a) /pci@1f,4000/scsi@3,1/disk
     b) /pci@1f,4000/scsi@3/disk
     c) /pci@1f,4000/ebus@1/fdthree@14,3023f0
     q) NO SELECTION
     Enter Selection, q to Quit:     
     
     Choose "a" for selection.
     
     Results will be:
     /pci@1f,4000/scsi@3,1/disk has been selected.
     Type ^Y ( Control-Y ) to insert it in the command line.
     e.g. ok nvalias mydev ^Y
             for creating devalias mydev for 
     /pci@1f,4000/scsi@3,1/disk
             
     At the ok prompt, type "boot" (without the double quotes) add a 
     space by hitting the [SPACE] bar and then hit the "CONTROL" and 
     "Y" keys like so:
     
     ok boot ^Y
     
     Results will be:
     ok boot /pci@1f,4000/scsi@3,1/disk
     
     Now just add the following "@6,0:f" to the end of this line
     (without the double quotes) before hitting [RETURN].
     
     Results will be:
     ok boot /pci@1f,4000/scsi@3,1/disk@6,0:f
     
     METHOD 2:
     ---------
     Type in the whole hardware device path for the external cdrom
     drive's controller.
     
     ok boot /pci@1f,4000/scsi@3,1/disk@6,0:f