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[avr-gcc-list] jump_to_null question

From: Jan Menzel
Subject: [avr-gcc-list] jump_to_null question
Date: Thu, 24 May 2007 11:54:38 -0000
User-agent: Thunderbird (Windows/20070221)

Hi all!
I'm currently working on a bootloader for Mega8 and 88 and found a problem I do not yet understand. At the end of the bootloader the code has to jump to the main reset vector at address 0x0000. If I do the usual way
        void (*jump_to_null)(void) = 0x0000;
gcc 3.4.6 complies:
        LDI     R30, 0x0102
        LDI     R31, 0x0103
and everything works fine, as expected.
        But if I try to be more specific and define
        void (* const jump_to_main)(void) = 0x0000;
gcc 3.4.6 complies
        RCALL   PC-0x0009
which unfortunately does not what I intended.
Could anyone please point me to my error in reasoning or lack of understanding? Many thanks!

        Best regards

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