Re: [avr-gcc-list] jump_to_null question

[Dr. Jan Menzel]

Eric Weddington wrote:
> The OP pointed out the same thing as Eric P. and Bernard both point out. He
> told me in a private response (that I think he forgot to CC the list).
The datasheet says (for Mega8, ID: 2486P–AVR–02/06, page 47) that you 
can only move all interrupt vectors besides reset using IVSEL. The 
location of the reset vector is defined by BOOTRST fuse.

> Eric Weddington
>
> > -----Original Message-----
> > From: 
> > address@hidden 
> > [mailto:address@hidden
> > org] On Behalf Of Eric Pasquier
> > Sent: Thursday, May 24, 2007 9:10 AM
> > Cc: address@hidden
> > Subject: Re: [avr-gcc-list] jump_to_null question
> >
> > "I don't see how you can avoid jumping to 0x0 when a 
> > bootloader ends its 
> > work"
> >
> > Check MCUCSR ?
> >
> > Eric Pasquier
> >
> > ----- Original Message ----- 
> > From: "Bernard Fouché" <address@hidden>
> > To: "Eric Weddington" <address@hidden>
> > Cc: <address@hidden>
> > Sent: Thursday, May 24, 2007 4:40 PM
> > Subject: Re: [avr-gcc-list] jump_to_null question
> >
> >
> > > Eric Weddington wrote:
> > > >  2. The best way to reset the AVR, is not by jumping to 
> > the reset vector.
> > > > When you do that, some of the registers may be left in a 
> > state that is 
> > > > not
> > > > the default. The best way to reset is to enable the 
> > watchdog timer on the
> > > > shortest time-out, go into an infinite loop, and let the 
> > watchdog reset 
> > > > the
> > > > AVR. Depending on which AVR you are using, you will have 
> > to turn off the
> > > > watchdog timer after reset, with code in the .init3 
> > section, for example.
> > > >
> > > In this case his bootloader will start again. I don't see 
> > how you can 
> > > avoid jumping to 0x0 when a bootloader ends its work.
> > >
> > > Bernard
>
>
>
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