How to read E450 device path and correlate it to PCI slot #

For Example:  

  /pci@6,4000/scsi@2      

For Example:  

  /pci@6,4000/scsi@2 - This path would point you to the card in slot # 3

* for <device> in this example, we are using scsi.  You may see other devices 
  such as network.  It depends on the type of card occupying the slot.


Slot 10       	/pci@1f,4000/<device>@4

Slot 9		/pci@4,4000/<device>@2

Slot 8		/pci@4,4000/<device>@3

Slot 7		/pci@4,4000/<device>@4

Slot 6		/pci@4,2000/<device>@1

Slot 5		/pci@1f,2000/<device>@1

Slot 4		/pci@6,2000/<device>@1

Slot 3		/pci@6,4000/<device>@2

Slot 2		/pci@6,4000/<device>@3

Slot 1		/pci@6,4000/<device>@4

  In the case you have a dual PCI SCSI card in one or more slots, these cards
actually have two SCSI controllers on the one card.  So, you will see two
device paths for the one card, for example

/pci@4,2000/scsi@1 & /pci@4,2000/scsi@1,1  would both point to the dual SCSI
controller card occupying slot # 6 of your e450.  The scsi@1 referring to 
one of the controllers on the card and the scsi@1,1 referring to the other.

Other info you can ascertain from an e450 device path:

  Any path with /pci@x,2000 - the 2000 indicates a 66Mhz slot (3 total)
  Any path with /pci@x,4000 - the 4000 indicates a 33Mhz slot (7 total)

  /pci@1f,4000/scsi@3 does not appear in the list above, but you may
  see this device path reported.  This path points to the controller
  built onto the system board that controls the first four internal disk 
  slots in the e450 (bottom four slots).  
  /pci@1f,4000/scsi@2 does not appear in the list above, but you may
  see this device path reported.  This path points to the controller 
  built onto the system board that controls your internal cdrom and/or
  tape drive, as well as the built in SCSI port on the system board.

NOTE:  Also see infodoc 16735 for usefull info on setting the disk-led-assoc
       variable so you can easily translate device paths to which slot an
       internal disk is occupying.