# unpackage busybox tarball
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tar xjf busybox-1.27.2-patch-reboot-arg.tar.bz2
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# copy rockchip's busybox defconfig
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# busybox_spi_nor_defconfig used for spi nor
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# busybox_emmc_defconfig used for eMMC (default)
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cp busybox-1.27.2-patch/configs/busybox_defconfig busybox-1.27.2/configs/busybox_defconfig
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# change directory to busybox
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cd busybox-1.27.2
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# config defconfig
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make busybox_defconfig
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# compile, Notice: the cross compile tool is in the prebuilts directory of SDK
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make ARCH=arm install CROSS_COMPILE=~/RV1109-SDK/prebuilts/gcc/linux-x86/arm/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin/arm-linux-gnueabihf- -j32
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cd ..
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# unpackage base root filesystem which is pre-built bin, e.g. target-emmc-v1.1.0.tar.bz2
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tar xjf target-emmc-v1.1.0.tar.bz2
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# copy busybox target bin and libs to target directory (option)
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cp busybox-1.27.2/_install/* target/ -rfa
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# package root filesystem with squashfs
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mksquashfs target rootfs.squashfs -noappend -comp xz
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# for spi nor
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# package root filesystem with squashfs
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# --pad : partition size
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mkfs.jffs2 -r target -o rootfs.jffs2 --pad=0x400000 -n
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# package root filesystem with ext4, e.g.
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tar xjf tools.tar.bz2
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./tools/mkfs-ext4/do-mkfs.ext4.sh target rootfs.ext4 64M
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# the command of unpackage squashfs filesystem : unsquashfs ./rootfs.squashfs
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