Technical data

2-34 Diagnostic Procedures
9. When you are finished using POD mode, repeat steps 1 through 7, and reset bits 4 and
5 so that the system boots normally.
2.5.6 Using POD to Diagnose MC3 Clock Jitter
The following procedure, run from POD mode, can determine if an MC3 board has a clock
jitter problem:
1. Enter POD mode. To enter POD mode, use the procedures outlined in Section 4.5.2,
“Key Switch in the Manager Position” or Section 2.5.5, “Procedure to Cause a Hung
System to Enter POD Mode.”
2. At the POD prompt, enter the command info to display boards in slots. Note which
slots contain MC3 boards.
3. Enter the command dmc dd, where dd is the hex slot number of an MC3. Do this for
each slot containing an MC3 board. See Section 5.6.4, “Using POD to Examine
HARDWARE ERROR STATE Messages” for complete information on interpreting the
output of the dmc command.
4. Examine the EBus Error and Error = fields for:
EBus Error, bits 2 or 3 set (0x4 or 0x8)
and
Leaf 0 and Leaf 1 “Error =” field is 0
These messages indicate an MC3 problem, most likely clock jitter. To fix this requires
upgrading the MC3 or trying the voltage reduction workaround described in the
Challenge/Onyx Retrofit II Requirements document.
If the Leaf 0 or Leaf 1 Error = field has any bits set, there is an MC3 SIMM problem.