Re: [avr-gcc-list] Move interrupt vector to bootloader

[Marek Michalkiewicz]

On Sat, Feb 05, 2005 at 09:20:48AM +0700, andi wrote:
> Does anyone know how to move interrupt vector to bootloader in 'C' ?

Pass -Ttext 0x1800 to avr-ld when linking the bootloader, like this:

avr-gcc -Wl,-Ttext,0x1800 

and the program will be located at the specified byte address
(0x1800 is an example for the largest ATmega8 bootloader - 1K words).

On the larger chips, the following avr-gcc options may be useful when
building bootloaders:

 -mshort-calls:
   use "rcall" (smaller than "call"), recommended for <=4K bootloaders
   on >8K devices ("rcall" is enough to reach anywhere in the bootloader)

 -mno-tablejump:
   *required* for bootloaders on >64K devices if -mshort-calls is not used,
   to avoid tablejump insns using "lpm" (which won't work above 64K)

Hope this helps,
Marek