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.

Restarting the System

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.