qemu-system-arm -M vexpress-a9 -kernel vmlinuz-3.2.0-4-vexpress -initrd initrd.img-3.2.0-4-vexpress -drive if=sd,file=debian_wheezy_armhf_standard.qcow2 -append "root=/dev/mmcblk0p2"
sudo tunctl -t tap0 -u `whoami` # 为了与 QEMU 虚拟机通信,添加一个虚拟网卡
sudo ifconfig tap0 10.10.10.1/24 # 为添加的虚拟网卡配置 IP 地址
qemu-system-arm -M vexpress-a9 -kernel vmlinuz-3.2.0-4-vexpress -initrd initrd.img-3.2.0-4-vexpress -drive if=sd,file=debian_wheezy_armhf_standard.qcow2 -append "root=/dev/mmcblk0p2 console=ttyAMA0" -net nic -net tap,ifname=tap0,script=no,downscript=no -nographic