Kernel build script

build.sh

#!/usr/bin/env sh

# settings
USECCACHE=1
CROSS_COMPILE=arm-none-eabi-
ARCH=arm
MAKEPARAM="all"

#############################################

function help() {
    echo "build kernel und copy to sd card"
    echo -e "./build.sh <makejobs> [copy]\n"
    echo -e "\tmakejobs: parallel make jobs"
    echo -e "\tuse 0 to determine automatically\n"
    echo -e "\tcopy: when specified, copy kernel to target\n"
}

function main() {
    [[ -z $1 ]] && help && exit 1

    [[ $USECCACHE == 1 ]] && export PATH="/usr/local/bin/ccache:$PATH"
    export CROSS_COMPILE
    export ARCH

    [[ $1 > 0 ]] && JOBS=$1 || JOBS=$(nproc)

    # build kernel
    make -j $JOBS $MAKEPARAM
    mkimage -f fitimage.its linux.fit

    # copy to target
    [[ $2 == "copy" ]] && ./target_copy.sh
}

main $@