Raspberry Pi /History: Build avr-gcc tool chain for ATMega256RFR2

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Raspberry Pi
Sun Mar 16 19:44:44 EST 2014 [andyg]
Build avr-gcc tool chain for ATMega256RFR2
- See http://www.nongnu.org/avr-libc/user-manual/install_tools.html
- See http://permalink.gmane.org/gmane.comp.gcc.patches/283638
- See https://github.com/matthijskooijman/pinoccio-firmware
- See http://apt.stderr.nl/pool/main/g/gcc-avr/gcc-avr_4.8-2.pinoccio1.tar.gz
  Contains avr-gcc "02_support_rfr2.patch" used below

  export PREFIX=/usr/local/avr
  export PATH=$PREFIX/bin:$PATH
  mkdir $PREFIX
  cd    $PREFIX
  mkdir downloads src

  cd downloads
  wget ftp://sourceware.org/pub/binutils/releases/binutils-2.24.tar.bz2
  wget http://www.netgull.com/gcc/releases/gcc-4.8.2/gcc-4.8.2.tar.bz2

# Build avr binutils
# http://sources.redhat.com/binutils
  cd ../src
  bunzip2 -c ../downloads/binutils-2.24.tar.bz2 | tar xf -
  cd binutils-2.24
  mkdir obj-avr
  cd obj-avr
  ../configure --prefix=$PREFIX --target=avr --disable-nls
  make
  make install

# Test new avr binutils
  avr-as --help | grep -i rfr2  # Should see "atmega256rfr2"

# Build avr-gcc
# http://gcc.gnu.org
  apt-get install libgmp-dev libmpfr-dev libmpc-dev

  cd ../..
  bunzip2 -c ../downloads/gcc-4.8.2.tar.bz2 | tar xf -
  cd gcc-4.8.2
  patch <02_support_rfr2.patch  # See gcc-avr_4.8-2.pinoccio1.tar.gz
    File to patch: gcc/config/avr/avr-mcus.def
  mkdir obj-avr
  cd obj-avr
  ../configure --prefix=$PREFIX --target=avr --enable-languages=c,c++ \
    --disable-nls --disable-libssp --with-dwarf2
  make
  make install

# Test new avr-gcc
  avr-gcc -mmcu=atmega256rfr2  # Should not complain about an unsupported MCU type

# Build avr-libc
# http://savannah.nongnu.org/projects/avr-libc
  cd ../..
  svn co svn://svn.sv.gnu.org/avr-libc/trunk/avr-libc
  cd avr-libc
  ./bootstrap
  ./configure --prefix=$PREFIX --build=`./config.guess` --host=avr
  make
  make install

# Build avrdude 6.1 (support for ATMega256RFR2)
# http://savannah.nongnu.org/projects/avrdude
  apt-get install flex

  cd ../..
  gunzip -c ../downloads/avrdude-6.1.tar.gz | tar xf -
  cd avrdude-6.1
  mkdir obj-avr
  cd obj-avr
  ../configure --prefix=$PREFIX
  make
  make install

# Test new avrdude
  avrdude -c stk500 -p atmega256rfr2