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PPCBug Firmware
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 C, 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.
Configuring the PPCBug Parameters
The parameters that can be configured using ENV are:
Bug or System environment [B/S] = B?
BBug is the mode where no system type of support is displayed. However,
SSystem 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 C, Related Documentation.
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.
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