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0db361d49d
We currently don't provide the DFU Functional Descriptor, which modern versions of dfu-util request to determine the transfer size. Luckily, they don't do this if the transfer size is given on the command line.
Requires very recent toolchain, because ATmega32U2 is relatively new.
Building:
make
make upload prog
--------------------------
Making the toolchain:
# patches according to
# http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=789527
# some gcc prerequisites
apt-get remove avr-libc gcc-avr binutils-avr
apt-get install libmpfr-dev libmpc-dev
# binutils
wget http://ftp.gnu.org/gnu/binutils/binutils-2.21.tar.bz2
tar xfj binutils-2.21.tar.bz2
cd binutils-2.21
./configure --target=avr --disable-nls
make
make install
# gcc
wget http://ftpmirror.gnu.org/gcc/gcc-4.5.2/gcc-4.5.2.tar.bz2
wget -O gcc_452_avr.patch http://gcc.gnu.org/bugzilla/attachment.cgi?id=23050
tar xfj gcc-4.5.2.tar.bz2
cd gcc-4.5.2
patch -p1 -s <../gcc_452_avr.patch
mkdir obj-avr
cd obj-avr
../configure --target=avr --enable-languages=c \
--disable-nls --disable-libssp --with-dwarf2
make
make install
wget http://download.savannah.gnu.org/releases/avr-libc/avr-libc-1.7.1.tar.bz2
tar xfj avr-libc-1.7.1.tar.bz2
cd avr-libc-1.7.1
./bootstrap # the automake at the end takes a while
./configure --build=`./config.guess` --host=avr
make
make install