System Startup, Configuration, and Shutdown Reference Manual (32650-90892)

Appendix A 191
Using the Access Port (AP)
Configuring the Console
System status display during console mode is enabled.
Disabling the SPU Hex Status Display
Entering DS disables the display of the system status line, including the system front panel
hex display codes on the console during console mode. See the ES command for more
details.
The system displays a message when the command is successful:
System status display during console mode is disabled.
Hard Resetting the SPU
Issuing the RS command causes the AP to reset the entire SPU, halting all processing and
I/O activity with the exception of itself and a few operations that must maintain state even
over resets. The AP clears all data from the standard output (SO) and data processing
first-in-first-out (DP FIFO) buffers. When the first character arrives from either buffer, the
AP returns the console from control mode to console mode.
NOTE The AP command interpreter is active during the period between command
execution and the arrival of characters (on either buffer ports) from the
system, though the control mode prompt (CM>) isn’t available.
Executing this command generates messages and prompts essential to resetting the
system.
If the AP command interpreter encounters errors or inappropriate input during the reset
(RS) process, it may display a combination of the following messages:
Expecting ”Y” or ”N” (APERR 11)
Unable to verify assertion of RESET_SYS backplane
signal (APERR 01).
RESET SYS backplane signal asserted, but unable to
verify SPU deassertion of PPON backplane
signal (APERR 02).
PPON not reasserted by SPU after RESET_SYS
deassertion (APERR 03).
The last three messages appear as a result of certain failures detected by the AP during
the reset process. These messages are key to isolating the cause of the failure of the failed
field-replaceable unit.
Once the reset is complete, the system displays the following message:
SPU hardware was successfully reset. (APMSG 02)
Transferring Control (Soft Reset)
The TC command initiates a transfer of control, or soft reset, of the system.