Motorola MVME162P-242, Installation And Use Manual

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Startup and Operation
2
Network Auto Boot is controlled by parameters contained in the NIOT
and ENV commands. These parameters allow the selection of specific
boot devices, systems, and files, and allow programming of the Boot delay.
Refer to the ENV command description in Chapter 3 for more details.
Restarting the System
You can initialize the system to a known state in three different ways:
Reset, Abort, and Break. Each method has characteristics which make it
more suitable than the others in certain situations.
A special debugger function is accessible during resets. This feature
instructs the debugger to use the default setup/operation parameters in
ROM instead of your own setup/operation parameters in NVRAM. To
activate this function, you press the
RESET
and
ABORT
switches at the
same time. This feature can be helpful in the event that your
setup/operation parameters are corrupted or do not meet a sanity check.
Refer to the ENV command description in Chapter 3 for the ROM
defaults.
Reset
Powering up the MVME162P2 initiates a system reset. You can also
initiate a reset by pressing and quickly releasing the
RESET
switch on the
MVME162P2 front panel, or reset the board in software.
For details on resetting the MVME162P2 board through software, refer to
the MVME1X2P2 VME Embedded Controller Programmer’s Reference
Guide.
Both “cold” and “warm” reset modes are available. By default, 162Bug is
in “cold” mode. During cold resets, a total system initialization takes place,
as if the MVME162P2 had just been powered up. All static variables
(including disk device and controller parameters) are restored to their
default states. The breakpoint table and offset registers are cleared. The
target registers are invalidated. Input and output character queues are
cleared. Onboard devices (timer, serial ports, etc.) are reset, and the two
serial ports are reconfigured to their default state.