"peed all over the data", Must be a technical term... :)

Alan

-----Original Message-----
From: dave vanhorn <dvanhorn@CEDAR.NET>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Tuesday, February 16, 1999 4:44 PM
Subject: Re: filling unused code space


>At 01:17 PM 2/16/99 -0800, Gerhard Fiedler wrote:
>>At 14:18 02/16/99 -0500, dave vanhorn wrote:
>>>Wouldn't JMP Start suffice (or whatever you call the beginning of your
>>>code), which is where the reset vector will take it anyway?
>>
>>why not leave it unprogrammed, as somebody suggested before (so you can
add
>>something in case you need it)? that's something like ADDLW FFh (on the
>>14bitters) and either it wraps around to reset, or you put a "jmp here"
>>endless loop at the end and let it get hit by the watch dog. which seems
to
>>be the proper way to do it.
>
>Depends on the system, I can see leaving a block of codespace somewhere
>blank, but you aren't going to need inbetween routines, since you can't get
>there anyway.  Everything I work on at the moment is flash, so I'm not
>likely to need to go burn a single byte change anywhere, that would be more
>work than reloading the whole codespace.
>
>You may not have a watchdog.. Our financial systems don't. We determined
>that a watchdog couldn't possibly stop the processor before it peed all
>over the data, if it wanted to, and so we used JMP 0 equivalents to force a
>reset.
>