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
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Busybox Settings --->
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[*] 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 -s chmod a+x rcS cd ..
vim fstab
proc /proc proc defaults
tmpfs /tmp tmpfs defaults
sysfs /sys sysfs defaults
tmpfs /dev tmpfs defaults
debugfs /sys/kernel/debug defaults defaults vim inittab
::sysinit:/etc/init.d/rcS
::respawn:-/bin/sh
::askfirst:-/bin/sh
::ctrlaltdel:/bin/umount -a -r cd ..
cd dev
sudo mknod console c
sudo mknod null c 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_defconfig make menuconfig
General setup --->
[*] Initial RAM filesystem and RAM disk (initramfs/initrd) support
(_install) Initramfs source file(s) () Default kernel command string Kernel 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 -m 1024M -kernel arch/arm/boot/zImage -append "rdinit=/linuxrc console=ttyAMA0 loglevel=8" -dtb arch/arm/boot/dts/vexpress-v2p-ca9.dtb -nographic