Artesyn MVME51005E SBC Installation and Use (July 2014) - Manual (Page 45)

PPCBug Firmware
MVME51005E Single Board Computer Installation and Use (6806800A38D) 47
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
Appendix D, Related
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.
3.4.2.1 Configuring the PPCBug Parameters
The parameters that can be configured using ENV are:
Bug or System environment [B/S] = B?
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 (that is, 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.
The default value for this parameter is one.
Note: The bug does not automatically acquire all of the memory it is allowed. It accumulates
memory as necessary in one megabyte blocks.
B Bug is the mode where no system type of support is
displayed. However, system-related items are still
available. (Default)
S 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
Appendix D, Related
Documentation .