10-10 Sun Ultra 45 and Ultra 25 Workstations Service and Diagnostics Manual • May 2006
Before powering on the workstation, ensure that the keyboard and mouse are
connected to the rear panel USB ports.
Note – The Stop-A and Stop-N key sequences are sometimes referred to as
“OpenBoot Emergency Procedures.”
10.5.1 Stop-A Key Sequence
Caution – Using the Stop-A key sequence while the Solaris OS is running causes a
system halt. The system state is lost, file systems are not synchronized, and data
might be lost or corrupted.
Use the Stop-A key sequence to abort an OpenBoot process. To issue the Stop-A key
sequence for the Sun Ultra 45 or Ultra 25 workstation, press both the Stop and A
keys (Stop-A) immediately after powering on the workstation. Hold both keys down
until the workstation beeps.
Note – Using Stop-A does not enable the workstation to perform a core dump. The
information from a core dump could be useful if the Solaris Operating System has
crashed.
10.5.2 Stop-N Equivalent Key Sequence Procedure
For older Sun systems, issuing the Stop-N key sequence upon startup resets
workstation configuration variables. The Sun Ultra 45 and Ultra 25 workstations use
a Sun Type-7 USB keyboard. It is not possible to issue a Stop-N key sequence with a
USB keyboard. By the time the USB keyboard driver is loaded, the interval to use the
Stop-N key sequence has expired. Instead, use the following procedure to reset your
workstation configuration variables. This procedure puts the Sun Ultra 45 or Ultra 25
workstation into a Safe NVRAM mode.
10.5.2.1 Resetting the NVRAM Temporarily
1. Power on the workstation and wait until the front panel Power button LED begins
to flash.
2. Quickly press the front panel Power button twice (similar to the way you would
double-click a mouse).
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