Motorola MVME166IG/D2 - Manual (Page 94)

Configure and Environment Commands
A-2 MVME166 Single Board Computer Installation Guide
A
Using the I option initializes the unused area of the board information block
to zero.
Modification is permitted by using the M option of the command. At the end
of the modification session, you are prompted for the update to Non-Volatile
RAM (NVRAM). A
Y response must be made for the update to occur; any
other response terminates the update (disregards all changes). The update
also recalculates the checksum.
Be cautious when modifying parameters. Some of these parameters are set up
by the factory, and correct board operation relies upon these parameters.
Once modification/update is complete, you can now display the current
contents as described earlier.
Set Environment to Bug/Operating System
ENV [;[D]]
The ENV command allows you to interactively view/configure all Bug
operational parameters that are kept in Battery Backed Up RAM (BBRAM),
also known as Non-Volatile RAM (NVRAM). The operational parameters are
saved in NVRAM and used whenever power is lost.
Any time the Bug uses a parameter from NVRAM, the NVRAM contents are
first tested by checksum to insure the integrity of the NVRAM contents. In the
instance of BBRAM checksum failure, certain default values are assumed as
stated below.
The bug operational parameters (which are kept in NVRAM) are not
initialized automatically on power up/warm reset. It is up to the Bug user to
invoke the ENV command. Once the ENV command is invoked and executed
without error, Bug default and/or user parameters are loaded into NVRAM
along with checksum data. If any of the operational parameters have been
modified, these new parameters will not be in effect until a reset/powerup
condition.
If the ENV command is invoked with no options on the command line, you are
prompted to configure all operational parameters. If the ENV command is
invoked with the option D, ROM defaults will be loaded into NVRAM.