Technical data

ENV - Set Environment
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ENV - Set Environment
Use the ENV command to view and/or configure interactively all 172Bug
operational parameters that are kept in Non-Volatile RAM (NVRAM).
Refer to the Debugging Package for Motorola 68K CISC CPUs User’s
Manual for a description of the use of ENV. Additional information on
registers in the MVME172LX that affect these parameters appears in your
MVME172 VME Embedded Controller Programmer’s Reference Guide.
Listed and described below are the parameters that you can configure
using ENV. The default values shown were those in effect when this
publication went to print.
Configuring the 172Bug Parameters
The parameters that can be configured using ENV are:
Table 3-3. ENV Command Parameters
ENV Parameter and Options Default Meaning of Default
Bug or System environment [B/S] B Bug mode
Field Service Menu Enable [Y/N] N Do not display field service menu.
Remote Start Method Switch
[G/M/B/N]
B Use both methods [Global Control and Status
Register (GCSR) in the VMEchip2, and
Multiprocessor Control Register (MPCR) in
shared RAM] to pass and execute cross-loaded
programs.
Probe System for Supported I/O
Controllers [Y/N]
Y Accesses will be made to the appropriate
system buses (e.g., VMEbus, local MPU bus)
to determine presence of supported controllers.
Negate VMEbus SYSFAIL∗
Always [Y/N]
N Negate VMEbus SYSFAIL∗ after successful
completion or entrance into the bug command
monitor.
Local SCSI Bus Reset on
Debugger Startup [Y/N]
N No local SCSI bus reset on debugger startup.
Local SCSI Bus Negotiations
Type [A/S/N]
A Asynchronous negotiations.