Motorola MVME166D2 用户手册

Configure and Environment Commands

A-2

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.  

 [;[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.