Restarting the System
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2-11
2
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 MVME177P initiates a system reset. You can also initiate
a reset by pressing and quickly releasing the
RESET
switch on the
MVME177P front panel, or reset the board in software.
For details on resetting the MVME177P board through software, refer to
the MVME1X7P Single Board Computers Programmer’s Reference
Guide, listed under “Related Documentation” in Appendix E.
Both “cold” and “warm” reset modes are available. By default, 177Bug is
in “cold” mode. During cold resets, a total system initialization takes place,
as if the MVME177P 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.
During warm resets, the 177Bug variables and tables are preserved, as well
as the target state registers and breakpoints.
Note that when the MVME177P comes up in a cold reset, 177Bug runs in
Board mode. Using the Environment (ENV) or MENU commands can
make 177Bug run in System mode. Refer to Chapter 3 for specifics.
Summary of Contents for MVME177P
Page 1: ...MVME177P Single Board Computer Installation and Use V177PA IH1 Edition of October 2000 ...
Page 10: ...x ...
Page 12: ...xii ...
Page 14: ...xiv ...
Page 34: ...1 16 Computer Group Literature Center Web Site Hardware Preparation and Installation 1 ...
Page 48: ...2 14 Computer Group Literature Center Web Site Startup and Operation 2 ...
Page 92: ...C 2 Computer Group Literature Center Web Site Network Controller Data C ...
Page 98: ...D 6 Computer Group Literature Center Web Site Disk Tape Controller Data D ...
Page 108: ...Index IN 6 Computer Group Literature Center Web Site I N D E X ...