Re: [avr-gcc-list] Debugging a bootloader with JTAGICE mkII

[E. Weddington]

Wallace White wrote:

> Hi J"org -
>
> On 4/22/05, Joerg Wunsch <address@hidden> wrote:
>  
>
> I think I could do that... my whole program may get too big to fit
> into the bootloader memory region, but I could arrange the functions
> such that the necessary ones wind up in the bootloader.
>
> As for the lookup table, I suppose I could just locate it in .text
> too. I was aligning it to a page boundary, to simplify programming by
> page. I tried using the align directive, but it generated an error
> when using a value greater than 1!
>  
IIRC, the alignment on the AVR port is set to 1, so I'm not surprised 
that you got an error when trying to change (increase) that alignment. I 
*thought* there was something in the GCC manual about this, but I don't 
have a reference handy.

>  
>
> > Alas, on the ATmega128, you'll run into the additional problem that
> > GCC doesn't emit the correct DWARF information above 64 KB (has been
> > discussed here).  Maybe COFF works better in that case, I don't know.
> >    
>
> Lucky for me I'm using the ATmega32. 
>
> Is there a list of these known issues? I don't see them on the
> SourceForge bug tracker for WinAVR.
>  
I currently keep a list of known AVR issues (for GCC) over at the RTEMS 
website wiki:
<http://rtems.org/phpwiki/index.php/GCCAVRBugs>

This page might eventually move to a more AVR-centric website at some 
point in the future, i.e. when I get any spare time to do so.

>  
>
> > > I would try gdb and avarice, but I read in the WinAVR manual that
> > > avarice doesn't yet support the JTAGICE mkII.
> > >      
> > That will for sure happen, perhaps even very soon. <grin>
> >    
>
> Would you elaborate? I'd be very interested in that.
>
>  
Various avarice developers have said that they would like to add the 
mkII support to avarice, but it always seems to have been delayed. Jörg 
will very probably be adding the mk II support to avarice, and very 
soon, because he has a mandate to do so.

Eric