IBM 7012 G Series, Service Manual

Page: 37 / 264

Using SystemGuard
2-7
Power-on (PON) Tests
PON tests are run by SystemGuard whenever the system power comes on. There are two
types of tests:
•
A comprehensive set of tests are performed on the processors, cache, memory and
related hardware when the Fast-IPL flag is disabled.
•
A minimum core set of tests are performed on the processors, cache, memory and
related hardware during fast-IPL which cannot be turned off.
Following is an example of PON test output for the Fast-IPL type of test.
BUMP FIRMWARE – February 16, 1995
ID 07.01 – POWER_ON in EPROM
BUMP FIRMWARE – May 19, 1995
ID 07.04 – POWER_ON in FLASH PROM
– Low Interleaving –
Initial test on CPU 0 – * OK !
Initial test on CPU 1 – * OK !
Initial test on CPU 2 – * OK !
Initial test on CPU 3 – * OK !
Init 1024kb L2 cache by processor 0 – * OK !
Init 1024kb L2 cache by processor 1 – * OK !
Init 1024kb L2 cache by processor 2 – * OK !
Init 1024kb L2 cache by processor 3 – * OK !
Clearing 128 Mb by processor 0 –> **** OK !
CPU FIRMWARE – August 4, 1994
Processor 0 on IPL INIT
{{ 216 }}
{{ 220 }}
{{ 288 }}
{{ 278 }}
{{ 292 }}
{{ 286 }}
{{ 292 }}
Processor 0 on IPL Start
{{223}}
{{299}}
A flashing 888 is displayed if PON tests cannot start. If the PON test hangs, a three-digit
code corresponding to a failed component will be displayed.
Note that the system IPLs on the first available physical processor. If for any reason
processor 0 is not available, the system IPLs on processor 1, and then on 2 so on until a
processor is available. If all the processors are disabled, the PON test fails, and
SystemGuard treats this as a hardware component failure and goes into the
MAINTENANCE MENU in Service mode. In Normal mode, the PON test initiates dial-out, if
possible, and goes into Stall state afterward. No IPL proceeds. Processors can be manually
enabled again in Service mode through the MAINTENANCE MENU. This can also be
repaired locally by:
•
Turning the system power off
•
Moving the Physical Key into Service position