Re: [avr-libc-dev] ATMEGA16U2 support

[Paul Rathgeb]

I'm currently trying to recompile my toolchain with the support for
atmegaXXu2 MCUs, but I'm unable to find the patches for binutils 2.20 /
gcc 4.4.[23]. 
There's no new patches for new devices here
( 
http://www.freebsd.org/cgi/cvsweb.cgi/ports/devel/avr-binutils/files/patch-newdevices
 ) since Jun 2009. Where can I found the latest patches to add the u2 support ?

Thanks in advance,

Paul Rathgeb

On Fri, 2010-02-05 at 11:28 +0100, Joerg Wunsch wrote:
> As Paul Rathgeb wrote:
> 
> > Unfortunately, I don't found informations about the avr-libc support for
> > this controller. ATMEGA16U4 seems supported, but I don't know if I can
> > use this MCU type for the compilation.
> 
> ATmega16U2 is supported by avr-libc, provided your compiler has been
> patched to support it.  Presence of respective compiler support is
> autodetected when running avr-libc's configure script, and the
> respective pieces are omitted if the compiler support is missing.
> 
> I don't have an idea whether the AT90USB162 and the ATmega16U2 are
> binary (probably upwards) compatible; however, usually there are
> application notes available describing that kind of migration process.
> Please see whethere there's one around for this transition, and what
> it has to tell about binary compatibilty.  Of course, if they are
> binary compatible, you could just compile the code for an AT90USB162
> (which is likely to have better support even in somewhat older
> toolchain versions).
>