Compiling New Kernel For Raspberry Pi
- !/usr/bin/env sh
- Cross compiling a new Raspberry Pi kernel following instructions at:
- http://elinux.org/RPi_Kernel_Compilation
BASE="/storage/pi"
PI_HOST="dlk-rspi"
if [ ! -d "$BASE" ]; then
mkdir "$BASE"
fi
cd "$BASE"
- "if true;" then run this command block, "if false;" then don't
if true; then
# Clean up from previous run
rm -fr .git &>/dev/null
rm -fr kernel &>/dev/null
rm -fr tools &>/dev/null
rm -fr modules &>/dev/null
rm -fr firmware &>/dev/null
# Setup git environment
git init
[ 0 -ne $? ] && exit $?
# Get patched kernel that was supposed to fix TEAC USB DAC audio problems per
# http://volumio.org/forum/fixes-for-common-usb-dac-problems-with-rpi-t328.html
# Didn't work
#git clone --depth 1 git://github.com/petli/linux.git -b rpi-3.10-usb-sound-backport
# Get the latest stable kernel source
git clone --depth 1 git://github.com/raspberrypi/linux.git
[ 0 -ne $? ] && exit $?
fi
KERNEL_SRC="${BASE}/linux"
- "if true;" then download the compiler, "if false;" then don't
if true; then
git clone git://github.com/raspberrypi/tools.git
[ 0 -ne $? ] && exit $?
fi
if [ -d "${BASE}/tools/arm-bcm2708/arm-bcm2708-linux-gnueabi/bin" ]; then
CCPREFIX="${BASE}/tools/arm-bcm2708/arm-bcm2708-linux-gnueabi/bin/arm-bcm2708-linux-gnueabi-"
else
echo "CCPREFIX directory we expected does not exist, please edit script."
exit
fi
- "if true;" then copy .config from $PI_HOST, "if false;" then use the default .config
if true; then
echo "Getting /proc/config.gz from $PI_HOST"
scp ${PI_HOST}:/proc/config.gz .
[ 0 -ne $? ] && exit $?
cd "$KERNEL_SRC"
make mrproper
[ 0 -ne $? ] && exit $?
zcat "${BASE}/config.gz" >.config
[ 0 -ne $? ] && exit $?
rm -f "${BASE}/config.gz"
else
echo "Using default config from ${KERNEL_SRC}/arch/arm/configs/bcmrpi_defconfig"
cd "$KERNEL_SRC"
make mrproper
[ 0 -ne $? ] && exit $?
cp "${KERNEL_SRC}/arch/arm/configs/bcmrpi_defconfig" .config
[ 0 -ne $? ] && exit $?
fi
- Configure
yes | ARCH=arm CROSS_COMPILE="$CCPREFIX" make oldconfig
[ 0 -ne $? ] && exit $?
- Compile
CPU_COUNT=$(cat /proc/cpuinfo | grep -m 1 siblings | awk '{ print $3 }')
CPU_COUNT=$(( $CPU_COUNT + 1 ))
ARCH=arm CROSS_COMPILE="$CCPREFIX" make -j$CPU_COUNT
[ 0 -ne $? ] && exit $?
- Bundle kernel firmward and modules
mkdir "${BASE}/modules"
[ 0 -ne $? ] && exit $?
ARCH=arm CROSS_COMPILE="$CCPREFIX" INSTALL_MOD_PATH="${BASE}/modules" make -j9 modules_install
cd "${BASE}/modules/lib"
[ 0 -ne $? ] && exit $?
tar -zcvf modules.gz *
[ 0 -ne $? ] && exit $?
- Create boot image
cd "${BASE}/tools/mkimage"
[ 0 -ne $? ] && exit $?
./imagetool-uncompressed.py "${KERNEL_SRC}/arch/arm/boot/zImage"
- Get latest boot firmware
cd "$BASE"
git clone git://github.com/raspberrypi/firmware.git
[ 0 -ne $? ] && exit $?
- Install everything on the target
scp "${BASE}/tools/mkimage/kernel.img" root@${PI_HOST}:/boot/
[ 0 -ne $? ] && exit $?
scp "${BASE}/modules/lib/modules.gz" root@${PI_HOST}:/var/tmp/
[ 0 -ne $? ] && exit $?
ssh root@${PI_HOST} tar -C /lib -zxvf /var/tmp/modules.gz
[ 0 -ne $? ] && exit $?
scp firmware/boot/bootcode.bin root@{PI_HOST}:/boot/
[ 0 -ne $? ] && exit $?
scp firmware/boot/fixup.dat root@{PI_HOST}:/boot/
[ 0 -ne $? ] && exit $?
scp firmware/boot/start.elf root@${PI_HOST}:/boot/
[ 0 -ne $? ] && exit $?
if $(${CCPREFIX}-gcc -v 2>&1 | grep -qe "--with-float=soft"); then
scp -r firmware/opt/* root@${PI_HOST}:/opt/
elif $(${CCPREFIX}-gcc -v 2>&1 | grep -qe "--with-float=hard"); then
scp -r firmware/hardfp/opt/* root@${PI_HOST}:/opt/
else
echo "Cannot figure out which version of /opt/vc to copy over"
fi
