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#!/bin/bash
#
# Build ARM kernel for QEMU Raspberry Pi Emulation
#
# John Lane https://github.com/johnlane/rpi-utils
#
# Thanks to http://xecdesign.com/compiling-a-kernel/
#
#######################################################
# Compile for hard-float ?
HARDFLOAT=yes
if [[ ${HARDFLOAT} == yes ]]; then
TOOLCHAIN=arm-linux-gnueabihf
CONFIG_VFP=y
else
TOOLCHAIN=arm-linux-gnueabi
CONFIG_VFP=n
fi
rm -rf kernel-qemu
mkdir kernel-qemu
cd kernel-qemu
git clone --depth 1 git://github.com/raspberrypi/linux.git
wget http://xecdesign.com/downloads/linux-qemu/linux-arm.patch
patch -p1 -d linux/ < linux-arm.patch
cd linux
make ARCH=arm versatile_defconfig
cat >> .config << EOF
CONFIG_CROSS_COMPILE="$(which ${TOOLCHAIN}-gcc | sed "s/-gcc/-/")"
CONFIG_CPU_V6=y
CONFIG_ARM_ERRATA_411920=y
CONFIG_ARM_ERRATA_364296=y
CONFIG_AEABI=y
CONFIG_OABI_COMPAT=y
CONFIG_PCI=y
CONFIG_SCSI=y
CONFIG_SCSI_SYM53C8XX_2=y
CONFIG_BLK_DEV_SD=y
CONFIG_BLK_DEV_SR=y
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_TMPFS=y
CONFIG_INPUT_EVDEV=y
CONFIG_EXT3_FS=y
CONFIG_EXT4_FS=y
CONFIG_VFAT_FS=y
CONFIG_NLS_CODEPAGE_437=y
CONFIG_NLS_ISO8859_1=y
CONFIG_FONT_8x16=y
CONFIG_LOGO=y
CONFIG_VFP=${CONFIG_VFP}
CONFIG_CGROUPS=y
EOF
make -j 8 -k ARCH=arm CROSS_COMPILE=${TOOLCHAIN}- menuconfig
make -j 8 -k ARCH=arm CROSS_COMPILE=${TOOLCHAIN}-
cd ..
cp linux/arch/arm/boot/zImage kernel-qemu
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