3-16 Troubleshooting
High Priority Machine Check (HPMC)
Another type of failure is the High Priority Machine Check (HPMC). An HPMC is an abnormal condition
which has compromised the integrity of system processing. A CPU detects the HPMC and halts the system.
Use the recovery procedures in Table 3-11 to resolve the problem, or refer to the Troubleshooting HPMCs
section.
Troubleshooting HPMCs
When an HPMC occurs, the fault code is displayed on the front panel, and the console displays the status.
An HPMC is handled initially by Processor Dependent Code (PDC), which builds an error log and displays
chassis codes. When finished, it transfers control back to the operating system.
In HP-UX, when control is given back, a panic dump is created. The operating system saves a memory dump
to a special location on disk and attempts to reboot the system. The chassis codes displayed by PDC are no
longer visible.
On MPE/iX systems, further chassis codes are displayed on the console and the front panel. When the
system halts, you perform a memory dump (refer to the Performing a Memory Dump section). The chassis
codes displayed by PDC are no longer visible.
The HPMC error logs are the same for both operating systems. To access the error logs, reset the system.
When you get the PDC main menu, type SER to access the service menu. Then type PIM to list the contents
of the PIM dump. The most important information to look at are the timestamp, HPMC chassis code,
requestor/responder addresses, and memory plus I/O module error logs. HPMC chassis codes are reported
and logged by PDC for each processor detecting an HPMC. Refer to the following example of a CPU 0 PIM
dump:
1. Initial status of HPMC processing; CBFx
2. HPMC type detected by the CPU reporting these codes; 5x0n, x = processor MID (0 to 3, 6, 7).
3. HPMC type detected by Master Memory Controller; 7D0n
4. HPMC type detected by an I/O Adaptor; 5x0n, x = I/O adaptor MID (4 — 7).
5. Final status of PDC HPMC processing; CBFx
Table 3-11. HPMC Recovery Procedures
Symptoms Recovery Procedure
System halts. Record the sequence of 4-digit codes at bottom of console display. (Press
Control-B first.)
All user activity stops. Record information from the HPMC:
1. From the Main Menu, enter SER to access the Service Menu.
2. Enter the PDC command PIM.
3. Copy or print out the console display fields.
HPMC error message on console. Perform a memory dump. (If the computer did not respond to TC and you
had to perform an RS hard boot, do not perform a memory dump.)
--------------------------------------- Processor 0 HPMC Information ---------------------------------------
Timestamp = Thu Jan 12 18:03:07 GMT 1995 (19:95:01:12:18:03:07)
HPMC Chassis Code =
0xcbf0
1
0xcbfb
5
0x5002
2
0x7d08
3
0x7f00
3
0x5408
4
0x5502
4
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