HOWTO: manual kernel build from igors lib

I am use igors lib to get an suffucently patches kernel source  for bana Pi R1

and for test builds i use this script for my unattened kernel builds.

This allows directly install an fresh kernel and make an backup of the old kernel.

my custom kernel .config is then at $REL stored and used .

usage path : run igors compile.sh ,

                    wait till the source download done ,

                   do an CRTL-C once the kernel wants to compile from his lib

then i.e :

fw1 /t/GIT/output/linux-mainline # cp .config /t/GIT/.test5
fw1 /t/GIT/output/linux-mainline # /t/GIT/build.sh
Usage: /t/GIT/build.sh {build|timestamp|clean|install|install_uImage|install_dtbs|install_modules|install_uImage|install_headers|kversion|backup}
fw1 /t/GIT/output/linux-mainline # /t/GIT/build.sh build
 

--------------------code---------------------------------------------------------

#!/bin/bash

# http://piprojects.net/de/banana-pi-kernel-3-18-rc-bauen/
#
# debug
#set -x
#
#
GIT=/t/GIT
OUT=$GIT/output
SOURCES=$OUT/linux-mainline
INST=/usr/bin/install

REL=$GIT/.test5



timestamp() {
     D=`date +"%Y%M%d_%H%M"`
}    


cp_cfg() {
    cd $SOURCES
    test -f $REL && cp -p $REL .config

}

k_v() {
        #
        cd $SOURCES
                cp_cfg
        make oldconfig
        make modules_prepare
                kversion=$(make -s kernelrelease)
                echo $kversion
}

clean_kernel() {
        #
        cd $SOURCES
    #
    test -f .config && cp .config $GIT/.config-$kversion-$timestamp
    make clean
    make distclean
}

backup_boot() {
    test -d /boot.bak && rm -rf /boot.bak
    test -d /boot.bak || mkdir /boot.bak
    cd /boot
    cp -rp ./* /boot.bak
    cd
}


backup_dtb() {
            cp -rp /boot/dtb /boot.bak/
                #
                test -f /boot/dtb && rm -rf /boot/dtb
                test -d /boot/dtb && rm -rf /boot/dtb
                test -d /boot/dtb || mkdir -p /boot/dtb

}

compile_uImage() {
    #
    cd $SOURCES
    clean_kernel
    k_v
    #
    # https://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html
    CPPFLAGS="-Ofast"
    CFLAGS="-Ofast"
    #
    #
     make -j3 dtbs modules
     make -j3 LOADADDR=0x40008000 uImage
    #
    timestamp
}

compile_docs() {
    cd $SOURCES
    k_v
    #
    make mandocs
    #
    timestamp
}

install_modules() {
    cd $SOURCES
    #
    make modules_install INSTALL_MOD_PATH=/
    #
    timestamp
}

install_dtbs() {
    #
        cd $SOURCES
        k_v
    #
    backup_dtb
    
    if [ -d /boot/dtb ] && [ -d /boot.bak/dtb ]; then
        test -d /boot/dtb || mkdir -p /boot/dtb
            cp -rp arch/arm/boot/dts/*.dtb /boot/dtb
    else
        test -d /boot/dtb || mkdir -p /boot/dtb
        cp -rp /boot/dtb /boot.bak/
        #
        cp -rp arch/arm/boot/dts/*.dtb /boot
    fi
}

install_BPi_dtbs() {

        cd $SOURCES
    #
    backup_dtb
    #
    echo "Installing New sun7i-a20-bananapi.dtb "
        $INST -m 755 arch/arm/boot/dts/sun7i-a20-bananapi.dtb /boot/sun7i-a20-bananapi.dtb
    echo done
    ls -la /boot/sun7i-a20-bananapi.dtb
}

install_headers() {
        cd $SOURCES
        k_v
        make  headers_install ARCH=armv7l INSTALL_HDR_PATH=/usr/include
}

install_docs() {
        cd $SOURCES
        k_v
        make installmandocs
}


install_BPi_uImage() {
    #
    cd $SOURCES
    #
    backup_boot
    #
    k_v
    #
    echo "Installing New uImage"
    $INST -m 755 arch/arm/boot/uImage /boot/uImage
    $INST -m 755 arch/arm/boot/Image /boot/kernel.img

    install_BPi_dtbs
    #
    echo "Installing New uImage"
    $INST -m 644 .config /boot/config-$kversion

    echo "Installing New symvers-$kversion "
    $INST -m 644 ./Module.symvers  /boot/symvers-$kversion
    echo ""
    echo "done"
    ls -la /boot/symvers-$kversion /boot/kernel.img /boot/uImage /boot/config-$kversion /boot/sun7i-a20-bananapi.dtb
    echo ""
}

install_kernel() {
    #
    backup_boot
    #
    install_modules
    #
    install_BPi_dtbs
    #
    install_uImage
    #
    install_headers
    #
    install_docs
}

build_deb-pkg() {
    #
            #
        cd $SOURCES
        #
        backup_boot
        #
        k_v
    #
    #http://debian-handbook.info/browse/de-DE/stable/sect.kernel-compilation.html
    fakeroot-u   make deb-pkg
}

build_targz-pkg() {
        #
                #
        cd $SOURCES
        #
        backup_boot
        #
        k_v
        #
        fakeroot-u make targz-pkg
}


case "$1" in
build)    
    echo "Kernel build"
    compile_uImage
    echo "Kernel build done"
    timestamp
    
    ;;
clean)    
    echo "Kernel cleanup"
    clean_kernel
        ;;
install)
    echo "install all"
    install_kernel
        ;;
install_uImage)
    echo "install install_uImage"
    install_BPi_uImage
        ;;
install_dtbs)
    echo "install dtbs"
    install_BPi_dtbs
        ;;
install_modules)
    install_modules
        ;;
timestamp)
    timestamp
    echo "timestamp $D"
    ;;
kversion)
    k_v
    ;;
backup)
    backup_boot
    ;;

*)    echo "Usage: $0 {build|timestamp|clean|install|install_uImage|install_dtbs|install_modules|install_uImage|install_headers|kversion|backup}"
        ;;
esac
exit 0