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