IBM Power System POWER7 Series Common Service Procedures page 30

8. If there is no location information in the Location field, are there additional words displayed at the
top of the screen?
v Yes: Use the additional words to find the address information:
– If characters 7 and 8 of word two are 60:
- The direct select address is word four in the format BBBBCcbb.
- The device address is word five in the format abcd efgh.
– If characters 7 and 8 of word two are 13, 17, 27, or 29:
- The direct select address is word three in the format BBBBCcbb.
- The device address is word four in the format abcd efgh.
– If characters 7 and 8 of word two are 62:
- The direct select address might be word seven in the format BBBBCcbb.
- The device address might be word six in the format abcd efgh.
Continue with the next step.
v No: Go to "Hexadecimal product activity log data" on page 29 in "Service functions" on page 61
to obtain the address information. Then return here and continue with the next step.
9. The BBBBCcbb format is the hexadecimal direct select address of a card location in the system unit.
The format definition is:
v BBBB: System bus
v Cc: System card
v bb: System board
Continue with the next step for IOA and device address information.
10. Unit (device) address definitions are explained in an abcd efgh format. For example, if the unit
address is 0001 00FF, the address relates to the abcd efgh format as follows:
0 0 0 1 0 0 F F
(a b c d e f g h)
Figure 4. Example of unit (device) address definitions
The characters abcd efgh can have different meanings, depending on the subsystem that reports the
problem. However, they define the information that is contained in the unit (device) address as
follows.
Table 2. Character definitions
a
b
cd
ef
gh
Not applicable
ab
cd
ef
gh
a
16
SCSI-attached disk, tape, or optical
I/O adapter
I/O bus
Controller
Device
FF
Serial Attached SCSI (SAS)-attached disk, tape, or optical
I/O adapter
I/O bus
Controller
Device
FF
Communications
I/O bus