59 lines
2.1 KiB
Bash
Executable File
59 lines
2.1 KiB
Bash
Executable File
#!/bin/sh
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SRC_DIR=$(pwd)
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cd work/kernel
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# Change to the kernel source directory which ls finds, e.g. 'linux-4.4.6'.
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cd $(ls -d linux-*)
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# Cleans up the kernel sources, including configuration files.
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echo "Preparing kernel work area..."
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make mrproper
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# Read the 'USE_PREDEFINED_KERNEL_CONFIG' property from '.config'
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USE_PREDEFINED_KERNEL_CONFIG="$(grep -i USE_PREDEFINED_KERNEL_CONFIG $SRC_DIR/.config | cut -f2 -d'=')"
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if [ "$USE_PREDEFINED_KERNEL_CONFIG" = "true" -a ! -f $SRC_DIR/config_predefined/kernel.config ] ; then
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echo "Config file $SRC_DIR/config_predefined/kernel.config does not exist."
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USE_PREDEFINED_KERNEL_CONFIG="false"
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fi
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if [ "$USE_PREDEFINED_KERNEL_CONFIG" = "true" ] ; then
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# Use predefined configuration file for the kernel.
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echo "Using config file $SRC_DIR/config_predefined/kernel.config"
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cp -f $SRC_DIR/config_predefined/kernel.config .config
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else
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# Create default configuration file for the kernel.
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make defconfig
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echo "Generated default kernel configuration."
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# Changes the name of the system to 'minimal'.
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sed -i "s/.*CONFIG_DEFAULT_HOSTNAME.*/CONFIG_DEFAULT_HOSTNAME=\"minimal\"/" .config
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# Enable overlay support, e.g. merge ro and rw directories.
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sed -i "s/.*CONFIG_OVERLAY_FS.*/CONFIG_OVERLAY_FS=y/" .config
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# Step 1 - disable all active kernel compression options (should be only one).
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sed -i "s/.*\\(CONFIG_KERNEL_.*\\)=y/\\#\\ \\1 is not set/" .config
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# Step 2 - enable the 'xz' compression option.
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sed -i "s/.*CONFIG_KERNEL_XZ.*/CONFIG_KERNEL_XZ=y/" .config
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fi
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# Compile the kernel with optimization for 'parallel jobs' = 'number of processors'.
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# Good explanation of the different kernels:
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# http://unix.stackexchange.com/questions/5518/what-is-the-difference-between-the-following-kernel-makefile-terms-vmlinux-vmlinux
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echo "Building kernel..."
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make \
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CFLAGS="-Os -s -fno-stack-protector -U_FORTIFY_SOURCE" \
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bzImage -j $(grep ^processor /proc/cpuinfo | wc -l)
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# Install kernel headers in './usr' (this is not '/usr') which are used later
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# when we build and configure the GNU C library (glibc).
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echo "Generating kernel headers..."
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make headers_install
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cd $SRC_DIR
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