51 lines
848 B
Bash
51 lines
848 B
Bash
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# setup
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apt update
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apt-get install bzip2 git vim make gcc libncurses-dev flex bison bc cpio libelf-dev libssl-dev syslinux dosfstools
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git clone --depth 1 https://github.com/torvalds/linux.git
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cd linux
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make menuconfig
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# no change needed, just make sure 64bit is enabled
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# check num of cores using nproc
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make -j 4
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mkdir /boot-files
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cp arch/x86/boot/bzImage /boot-files/
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cd ..
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git clone --depth 1 https://git.busybox.net/busybox
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cd busybox
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# static build to keep it minimal
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make menuconfig
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make -j 4
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mkdir /boot-files/initramfs
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make CONFIG_PREFIX=/boot-files/initramfs install
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cd /boot-files/initramfs/
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echo -e '#!/bin/sh\n/bin/sh' > init
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chmod +x init
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rm linuxrc
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find . | cpio -o -H newc > ../init.cpio
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cd ..
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dd if=/dev/zero of=boot bs=1M count=50
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mkfs -t fat boot
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syslinux boot
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mkdir m
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mount boot m
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cp bzImage init.cpio m
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umount m
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