[En-Nut-Discussion] at91sam7x bloader

[Alain M.]

Hi Ole,

Ole Reinhardt escreveu:
> Hi,
> 
>> I've got a dataflash connected to at91, so the method will be to upload the
>> new firmware from web, store in the dataflash, reboot, and a bootloader will
>> update the firmware from dataflash if it needs.
> 
> Why so complicated? You could place the code of your update function in
> RAM and reflash your controller online. If you will use your normal
> application for that purpose this might not be what you want. In this
> case using dataflash as a buffer might be better.

I would not do it that way too. The problem is security, if the 
bootloader doesn't find an acceptable image or if some bit is not reset, 
the next time it could revert to a previous image. If it is done online, 
it can and up with an unuseable device...

Alain