About Post Diagnostics - Sun Microsystems Fire V890 Diagnostic Manual

About POST Diagnostics

The POST diagnostic code resides in the OpenBoot PROM on the system I/O board.
When you power on the system, POST runs automatically under certain conditions.
For information about running POST, see
POST tests the following system components:
CPU/Memory board
■
PCI slots (POST tests for shorts only)
■
DIMMs
■
Motherboard
■
OpenBoot diagnostic configuration variables, stored in the system nonvolatile
random access memory (NVRAM), enable you to control certain aspects of POST
testing. For information about the configuration variables, see
Configuration Variables for POST" on page
POST reports its test results through detailed diagnostic and error messages. See
"OpenBoot Configuration Variables for POST" on page 5
diagnostic and error messages.
By default, POST displays diagnostic and error messages through a tip connection
or a local ASCII terminal attached to the system's serial port A (ttya). You can also
redirect POST output to display remotely on a Remote System Control (RSC)
console. If you redirect POST output to an RSC console, POST results will not
display locally. See
information about redirecting POST output to an RSC console.
The system controller card runs its own POST diagnostics separately from the main
POST diagnostics. RSC POST tests the basic functions of the system controller card.
To view detailed diagnostic and error messages from RSC POST, you must attach an
ASCII terminal directly to the RSC serial port before running RSC POST. For more
information about RSC POST, see the Sun Remote System Control (RSC) User's Guide.
4 Sun Fire V890 Server Diagnostics Guide • October 2004
"Displaying POST Diagnostic Results" on page 11
"Running POST Diagnostics" on page
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