Motorola MVME187 User Manual

Booting and Restarting 187Bug

4-9

3. At powerup, Network Boot is enabled, and providing the 

drive and controller numbers encountered are valid, the 
following message is displayed on the system console: 

"Network Boot in progress... To abort hit <BREAK>" 

Following this message there is a delay to allow you to abort 
the Network Boot process if you wish. To gain control 
without Network Boot, you can press the 

BREAK

 key or the 

software 

ABORT

 or 

RESET

 switches.

4. Then the actual I/O begins: the program pointed to within 

the volume ID of the media specified is loaded into RAM and 
control passed to it. 

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 in Appendix A. 

You can initialize the system to a known state in three different 
ways: reset, abort, and break. Each has characteristics which make 
it more appropriate than the others in certain situations. 

The debugger has a special feature which can be used in the event 
your setup/operation parameters are corrupted or do not meet a 
sanity check. This feature:

❏

Is activated by pressing the 

RESET

 and 

ABORT

 switches at the 

same time, and releasing the 

RESET

 switch before the 

ABORT

 

switch.

❏

Instructs 187Bug to use the default setup/operation 
parameters in ROM instead of your setup/operation 
parameters in NVRAM. 

Refer to the ENV command (Appendix A) for the ROM defaults.