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

[Yannick PODGORSKI]

If it's not to late.
To move interrupt vector to bootloader in 'C' (page 48 of manual) :

/* Enable change of Interrupt Vectors */
GICR = (1<<IVCE);

/* Move interrupts to boot Flash section */

GICR = (1<<IVSEL);

If not the ATMEGA8 resets.



Yannick Podgorski

www.kuantic.com

----- Original Message ----- 
From: "Marek Michalkiewicz" <address@hidden>
To: "andi" <address@hidden>
Cc: <address@hidden>
Sent: Saturday, February 05, 2005 12:10 PM
Subject: Re: [avr-gcc-list] Move interrupt vector to bootloader


> 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
>
>
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