一、准备工具
1.1 安装相关工具
sudo apt-get install qemu libncurses5-dev gcc-arm-linux-gnueabi build-essential 1.2 下载kernel(linux-4.0)与busybox(1.24)源码
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/
https://busybox.net/downloads/busybox-1.24.0.tar.bz2
二、编译最小文件系统
2.1 解压busybox
export ARCH=arm export CROSS_COMPILE=arm-linux-gnueabi-make menuconfig 选中静态编译 | Busybox Settings ---> |[*] Build BusyBox as a static binary (no shared libs)make install cd _install mkdir etc dev mnt mkdir -p etc/init.d/ cd etc/init.d/vim rcS mkdir -p /proc mkdir -p /tmp mkdir -p /sys mkdir -p /mnt /bin/mount -a mkdir -p /dev/pts mount -t devpts devpts /dev/pts echo /sbin/mdev > /proc/sys/kernel/hotplug mdev -schmod a+x rcScd .. vim fstab proc /proc proc defaults 0 0 tmpfs /tmp tmpfs defaults 0 0 sysfs /sys sysfs defaults 0 0 tmpfs /dev tmpfs defaults 0 0 debugfs /sys/kernel/debug defaults defaults 0 0vim inittab ::sysinit:/etc/init.d/rcS ::respawn:-/bin/sh ::askfirst:-/bin/sh ::ctrlaltdel:/bin/umount -a -rcd .. cd dev sudo mknod console c 5 1 sudo mknod null c 1 3
拷贝交叉工具链的库到根文件系统
cp /opt/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabi/arm-linux-gnueabi/libc/lib/*so* lib/ -d
cp /opt/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabi/arm-linux-gnueabi/libc/usr/lib/*so* usr/lib -d
生成ext3镜像文件并挂载 sudo dd if=/dev/zero of=a9rootfs.ext3 bs=1M count=32
mkfs.ext3 path/a9rootfs.ext3
mkdir tmpfs
sudo mount -t ext3 a9rootfs.ext3 tmpfs -o loop
sudo cp -r rootfs/*tmpfs
sudo umount tmpfs
启动参数要添加-sd选项
进入系统执行mount -t ext3 /dev/mmcblk0 /mnt/ 2.2 linux编译配置
export ARCH=arm export CROSS_COMPILE=arm-linux-gnueabi- make vexpress_defconfigmake menuconfig General setup ---> [*] Initial RAM filesystem and RAM disk (initramfs/initrd) support (_install) Initramfs source file(s) () Default kernel command stringKernel Features ---> Memory split (3G/1G user/kernel split) ---> (X) 3G/1G user/kernel split make bzImage -j4 ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- make dtbs
启动qemu qemu-system-arm -M vexpress-a9 -smp 4 -m 1024M -kernel arch/arm/boot/zImage -append "rdinit=/linuxrc console=ttyAMA0 loglevel=8" -dtb arch/arm/boot/dts/vexpress-v2p-ca9.dtb -nographic
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