I've tried to recompile the toolchain (binutils 2.20 (patched); GCC
4.4.3; avr-libc 1.6.8).
I noticed that gcc 4.4.3 doesn't include the support for atmegaXXu2
MCUs. Due to this lack of support in GCC, avr-libc compiles without the
atmegaxxU2 serie.
Then, I've tried to add the support in gcc 4.4.3. You'll find the patch
in attachment. I should have missed something, because I have this kind
of errors when I compile my firmware
/usr/local/avr-4.4.3/lib/gcc/avr/4.4.3/../../../../avr/bin/ld: avr:35
architecture of input file `output/main.o' is incompatible with avr:5
output
I didn't find what's wrong in the patch I made. It's the first time I
try to patch something like that. The problem comes probably from my
inexperience...
So, I decided to test the toolchain with GCC 4.5. (binutils 2.20
(patched); GCC 4.5 (from SVN at rev 156830); avr-libc 1.6.8). I had some
problems to compile avr-libc (many devices were not supported,
especially the atxmega series. As I just need the atmegaxxU2 support,
I've bypassed almost all the other MCUs during the compilation.
Now, I'm able to compile my firmware. I didn't tested my code. I'll do
it soon.
Using the unstable version of GCC for this firmware is too critical. I
don't like the idea to produce a device in which the firmware is
compiled with an unstable / untested version of GCC. So, I really want
to find a way to add the support to GCC 4.3.x. Is there some patches for
this somewhere ? Or can someone have a look at my patch, and see what
I've done wrong ?
Thanks in advance,
Paul Rathgeb
On Wed, 2010-02-17 at 10:31 +0100, Joerg Wunsch wrote:
> As Weddington, Eric wrote:
>
> > I just tried to send patches to the avr-gcc-list ML for binutils
> > 2.20, but my corp email server was having some difficulty. I'll try
> > again later.
>
> Forwarded on Eric's behalf, Cc goes to avr-gcc-list, as the question
> came up there recently as well.
>
> Eric wrote: Special thanks to Anitha Boyapati for doing the porting
> work.
>
--- gcc/config/avr/avr.c 2009-08-25 21:03:53.000000000 +0200
+++ gcc/config/avr__/avr.c 2010-02-18 07:48:16.969805018 +0100
@@ -205,6 +205,9 @@
{ "avr35", ARCH_AVR35, NULL },
{ "at90usb82", ARCH_AVR35, "__AVR_AT90USB82__" },
{ "at90usb162", ARCH_AVR35, "__AVR_AT90USB162__" },
+ { "atmega8u2", ARCH_AVR35, "__AVR_ATmega8U2__" },
+ { "atmega16u2", ARCH_AVR35, "__AVR_ATmega16U2__" },
+ { "atmega32u2", ARCH_AVR35, "__AVR_ATmega32U2__" },
{ "attiny167", ARCH_AVR35, "__AVR_ATtiny167__" },
{ "attiny327", ARCH_AVR35, "__AVR_ATtiny327__" },
/* Enhanced, <= 8K. */
--- gcc/config/avr/avr.h 2009-03-28 22:09:50.000000000 +0100
+++ gcc/config/avr__/avr.h 2010-02-18 07:48:16.921804849 +0100
@@ -836,6 +836,9 @@
mmcu=at76*|\
mmcu=at90usb82|\
mmcu=at90usb162|\
+ mmcu=atmega8u2|\
+ mmcu=atmega16u2|\
+ mmcu=atmega32u2|\
mmcu=attiny16*|\
mmcu=attiny32*: -m avr3}\
%{mmcu=atmega8*|\
@@ -965,6 +968,9 @@
%{mmcu=atmega103|mmcu=avr31:crtm103.o%s} \
%{mmcu=at43usb320:crt43320.o%s} \
%{mmcu=at90usb162|mmcu=avr35:crtusb162.o%s} \
+%{mmcu=atmega8u2|mmcu=avr35:crtm8u2.o%s} \
+%{mmcu=atmega16u2|mmcu=avr35:crtm16u2.o%s} \
+%{mmcu=atmega32u2|mmcu=avr35:crtm32u2.o%s} \
%{mmcu=at90usb82:crtusb82.o%s} \
%{mmcu=attiny167:crttn167.o%s} \
%{mmcu=attiny327:crttn327.o%s} \
--- gcc/config/avr/t-avr 2009-03-28 22:09:50.000000000 +0100
+++ gcc/config/avr__/t-avr 2010-02-18 07:48:16.909816384 +0100
@@ -67,6 +67,9 @@
mmcu?avr31=mmcu?at43usb320 \
mmcu?avr35=mmcu?at90usb82 \
mmcu?avr35=mmcu?at90usb162 \
+ mmcu?avr35=mmcu?atmega8u2 \
+ mmcu?avr35=mmcu?atmega16u2 \
+ mmcu?avr35=mmcu?atmega32u2 \
mmcu?avr35=mmcu?attiny167 \
mmcu?avr35=mmcu?attiny327 \
mmcu?avr4=mmcu?atmega48 \
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