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get kernel source for current rpi raspbian wheezy kernel
#!/bin/bash
REV=`zcat /usr/share/doc/raspberrypi-bootloader/changelog.Debian.gz | grep '* firmware as of' | head -n 1 | sed -e 's/\ \*\ firmware as of \(.*\)$/\1/'`
rm -rf rasp-tmp
mkdir -p rasp-tmp
mkdir -p rasp-tmp/linux
wget https://raw.github.com/raspberrypi/firmware/$REV/extra/git_hash -O rasp-tmp/git_hash
wget https://raw.github.com/raspberrypi/firmware/$REV/extra/Module.symvers -O rasp-tmp/Module.symvers
SOURCEHASH=`cat rasp-tmp/git_hash`
wget https://github.com/raspberrypi/linux/tarball/$SOURCEHASH -O rasp-tmp/linux.tar.gz
cd rasp-tmp
tar -xzf linux.tar.gz
OSVERSION=`uname -r`
mv raspberrypi-linux* /usr/src/linux-source-$OSVERSION
ln -s /usr/src/linux-source-$OSVERSION /lib/modules/$OSVERSION/build
cp Module.symvers /usr/src/linux-source-$OSVERSION/
zcat /proc/config.gz > /usr/src/linux-source-$OSVERSION/.config
cd /usr/src/linux-source-$OSVERSION/
make oldconfig
make prepare
make scripts
cd ~
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