Env - Set Environment; Configuring The Ppcbug Parameters - Motorola AltiVec MVME5100 Series Installation & Use Manual

PPCBug Firmware

ENV - Set Environment

3

Configuring the PPCBug Parameters

3-8
Use the ENV command to view and/or configure interactively all PPCBug
operational parameters that are kept in Non-Volatile RAM (NVRAM).
Refer to the PPCBug Firmware Package User's Manual for a description
of the use of ENV. Additional information on registers in the Universe
ASIC that affect these parameters is contained in your MVME5100
Programmer's Reference Guide listed in
Documentation.
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.
The parameters that can be configured using ENV are:
Bug or System environment [B/S] = B?
B
S
Maximum Memory Usage (MB,0=AUTO) = 1?
This parameter specifies the maximum number of megabytes the bug is
allowed to use. Allocation begins at the top of physical memory and
expands downward as more memory is required until the maximum value
is reached.
If a value of zero is specified, memory will continue to be increased as
needed until half of the available memory is consumed (i.e. 32MB in a
64MB system). This mode is useful for determining the full memory
required for a specific configuration. Once this is determined, a hard value
may be given to the parameter and it is guaranteed that no memory will be
used over this amount.
Appendix C, Related
Bug is the mode where no system type of support
is displayed. However, system-related items are
still available. (Default)
System is the standard mode of operation, and is
the default mode if NVRAM should fail. System
mode is defined in the PPCBug Firmware
Package User's Manual listed in
Related Documentation.
Computer Group Literature Center Web Site
Appendix C,