Appendix D
Troubleshooting
D-7
If the failure is on a bus that spans multiple FRUs, follow the suggested steps in
C Fault Spanning Multiple FRUs” on page D-7
to isolate the
problem FRU.
If the failure is in the host, see
C Fault When Accessing the Link
Card Installed in the Host” on page D-11
D.2.2.1
I
2
C Fault Isolated to a Single FRU
If the fault list shows a single FRU as suspect, replace the FRU. The centerplane in
the chassis and the link cards each contain an I
2
C bus fully contained within the FRU.
Possible Causes
Faulty centerplane or link card.
Solutions
■
If the problem is in
hc:///iox=
box_instance
/i2c_c=0
, then replace the chassis
(
IOX@
nnnn
).
■
If the problem is in
hc:///iox=
box_instance
/iob=
x
/link=0/i2c_local=0
,
then replace this link card (
IOX@
nnnn
/IOB
x
/LINK
).
■
If the problem is in
hc:///chassis=0/iou=
x
/pcislot=
y
/link=
0/i2c_local=0
, then replace this link card (
IOU#
x
-PCI#
y
).
D.2.2.2
I
2
C Fault Spanning Multiple FRUs
There are three I
2
C bus trees in the External I/O Expansion Unit that span multiple
FRUs. They are identified on the centerplane as described in the following table.
TABLE D-1
Multiple FRUs Covered in I
2
C Buses
I
2
C Bus Tree
FRUs Covered in I
2
C Bus
hc:///iox=
box_instance
/i2c_a=0
Spans the centerplane, PSU 1, and boat 0
hc:///iox=
box_instance
/i2c_b=0
Spans the centerplane, PSU 0, and boat 1
hc:///iox=
box_instance
/i2c_main=0
Spans all the FRUs: the centerplane, both
PSUs, both boats, and the link cards
installed in the boats
Summary of Contents for SPARC Enterprise M4000
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