Xmega bootloader starting

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Hi,

I am working on a SD Card based bootloader on ATXMEGA253A3.I set the reset fuses bit on the boot section but the AVR start on the bootloader only on external reset never on software,power on reset or other reset ?

Thaks for your help !

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How do you know? It's certainly true for any AVr that when BOOTRST is enabled then the first opcode fetch will be the first opcode of the bootloader.