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???
08/30/05 06:17
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 		 #100268 - user bootloader?
Responding to: ???'s previous message
hi,

Jeroen Post said:

I want to replace the bootloader program preprogrammed by Atmel,
with my own bootloader.


Nice, why do you need to replace it exactly in the FM1 part of the flash memory which is accessed only via parallel programmer?
Atmel suggests more easy way:
- put own bootloader somewhere in the FM0 part of flash;
- put MSB of your bootloader address into SBV;
- clear bit BLJB.

Now your bootloader will be executed after each reset.

More details here: http://www.atmel.com/dyn/resou...oc4287.pdf

Regards,
Oleg

List of 28 messages in thread
TopicAuthorDate
Programming 89C5131 via hardware            01/01/70 00:00      
   the chip manufacturers have become wise            01/01/70 00:00      
      Programming 89C5131 via hardware (2)            01/01/70 00:00      
         just one question            01/01/70 00:00      
            Programming 89C5131 via hardware (3)            01/01/70 00:00      
               one problem with this is that you have n            01/01/70 00:00      
                  Atmel contact            01/01/70 00:00      
                     here we go again            01/01/70 00:00      
                        self-timing            01/01/70 00:00      
                           FLIP issue (modern technologies)            01/01/70 00:00      
                              lifetime            01/01/70 00:00      
                              transparent erasure            01/01/70 00:00      
                                 to: Jan Waclawek            01/01/70 00:00      
                              You've go to be kidding            01/01/70 00:00      
                                 self-timing            01/01/70 00:00      
                                    can you give me a reference to the fact            01/01/70 00:00      
                                       other way round            01/01/70 00:00      
         Contact Atmel            01/01/70 00:00      
      Bootloader bootloader            01/01/70 00:00      
         no way            01/01/70 00:00      
         Re: bootloader bootloader            01/01/70 00:00      
   Sounds like fun. Count me in.            01/01/70 00:00      
      Programming 89C5131 via hardware (2)            01/01/70 00:00      
   user bootloader?            01/01/70 00:00      
      Re: user bootloader?            01/01/70 00:00      
         what wrong?            01/01/70 00:00      
            Not, that old urban legend again            01/01/70 00:00      
               Atmel contact            01/01/70 00:00      

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