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[on:]

Hi!

I've got troubles with my Mega2560 on Gentoo.

First I got several "attempt to use poisoned "SIG_USART1_RECV" messages - downgrading avr-libc from 1.8.0 to 1.7.1 helped.

Then it did not find crtm2561.o libc.a and libm.a - fixed this with:

Code:

cd /usr/avr/lib
ln -s avr6/crtm2561.o .
ln -sf avr6/libc.a .
ln -sf avr6/libm.a .

But now I'm stuck with:

Code:

/usr/libexec/gcc/avr/ld: skipping incompatible /usr/lib/gcc/avr/4.5.3/libgcc.a when searching for -lgcc
/usr/libexec/gcc/avr/ld: cannot find -lgcc
collect2: ld returned 1 exit status

But this is the onyl avr-libgcc I've got. Has somebody any idea what's going on there?

[Reply #1 on:]

Got it!

Apply the second patch from https://bugs.gentoo.org/show_bug.cgi?id=378387 to crossdev and run "crossdev avr".

Then both of my Arduinos - Uno and Mega - work without any symlinks in /usr/avr/lib.

[Reply #2 on:]

The proposed solution does not work at all. Yes, the sketches compiles without errors, the upload is also done without problems, but when I tried the Examples AnalogReadSerial, DigitalReadSerial, BareMinimum and ASCIITable it wouldn't work.

Does anyone have an idea how to solve this problem? My Linux is Gentoo amd64.
I tried the proposed solution with the Uno, Mega2560 and with the Mega1280.

[Reply #3 on:]

Do you mean there is no serial monitor output?

Did you try the Blink example? Does the led blink?

[Reply #4 on:]

To get Serial communication on Mega2560 working:

apply the crossdev-patch from above, then run:

Code:

USE="-openmp" crossdev --target avr --gcc 4.6.2 --binutils 2.21.1 --libc 1.7.1 -s4 --without-headers

And make sure the gcc-4.6.2 is used (with gcc-config -l)

[Reply #5 on:]

Here is a thread covering your poisoned "SIG_USART1_RECV" messages.
http://arduino.cc/forum/index.php/topic,92364.0.html

That is a deprecated format in avr-libc 1.8.0.

Excuse my ignorance of Gentoo, but do they have this Arduino/AVR code in their repository? If they do, maybe you should contact them about getting that fixed.

[Reply #6 on:]

Yes, it works with the gcc-4.62.
Thanks guys, you are the greatest.
I never tried it with the gcc-4.6.2, but what matters is that works.
But, I still do not have the Serial working with Uno and Mega2560.
I upload the sketch but I never see anything in Serial monitor. The Blink example work fine.
With Mega1280 and Duemilanove everything works now including the Serial communication.

[Reply #7 on:]

But, I still do not have the Serial working with Uno and Mega2560.

Is your problem that you don't see the /dev/ttyACM0 in the arduino IDE?

I read somewhere in Gentoo forums or bugs, that the arduino-1.0 from portage has this problem for some people - So I decided to keep the old, "blue arduino" from the overlay for now.
But I can't find this thread again, sorry.

[Reply #8 on:]

Now everything works, including the Serial with Uno and Mega2560.

My Gentoo is multilib

I check the /etc/make.conf file:

USE="multilib unicode gtk ..."

First I cleaned all packages:

Code:

emerge -C sys-devel/crossdev cross-avr/gcc cross-avr/binutils cross-avr/avr-libc

Then I added these entries in /etc/portage/package.unmask file.

Code:

=cross-avr/binutils-2.21.1-r1
=cross-avr/avr-libc-1.7.1
=cross-avr/gcc-4.6.2

and this entry in /etc/portage/package.keywords file

Code:

=sys-devel/crossdev-20111221 ~amd64

I checked the versions of packages:

Code:

emerge -vp cross-avr/gcc cross-avr/binutils cross-avr/avr-libc

Then I have installed the crossdev package:

Code:

emerge sys-devel/crossdev

I applied the proposed patch from: https://378387.bugs.gentoo.org/attachment.cgi?id=285901

Code:

cp /usr/bin/crossdev /usr/bin/crossdev.bak
nano -w /usr/bin/crossdev

Then I run this line:

Code:

USE="-openmp" crossdev --target avr --gcc 4.6.2 --binutils 2.21.1 --libc 1.7.1 -s4 --without-headers

Finally I checked the version of the avr-gcc:

Code:

avr-gcc --v

Thank you for everything :-))))

[Reply #9 on:]

Hi Gentoo-Mega2560 users!

Actually (2013-03-16) following combination seems to work fine:
sys-devel/crossdev-20120721 (patched with patch from bug report 378387), cross-avr/gcc-4.6.3, avr-libc-1.8.0, cross-avr/binutils-2.21.1, (normally using cross-avr/binutils-2.22-r1 --> but segmentation fault occurred for Mega 2560)

Following code force the using of other binutils package than latest stable:

Code:

USE="-openmp" crossdev -t avr --binutils 2.21.1 -s4 -S --without-headers

Furthermore the symbolic link is still necessary:

Code:

ln -s /usr/x86_64-pc-linux-gnu/avr/lib/ldscripts /usr/avr/lib/ldscripts

Also the patch of Arduino.h is necessary like described above, add at line 3:
#define __AVR_LIBC_DEPRECATED_ENABLE__ 1

Good luck, Thomas