首先在VM虚拟机中安装qemu相关环境

forlinx@ubuntu:$ sudo apt-get install qemu-user-static

将Forlinx Desktop源码目录下OK3399-desktop-release/rootfs/ubuntu.img文件扩容后挂载（）

forlinx@ubuntu:~/OK3399-desktop-release/rootfs$ sudo fsck.ext3 -f IMAGE 

forlinx@ubuntu:~/OK3399-desktop-release/rootfs$ sudo resize2fs IMAGE SIZE

（IMAGE为要修改的镜像名称，SIZE为块的数量、一个块的大小为4K（即当SIZE为783770时，783770*4=3135080，大概为3.2G，1250000时为5G））按需求扩容对应的容量大小，ubuntu.img镜像大小与开发板rootfs分区有关，扩容为5G没有问题，再往上扩容需要查看开发板rootfs分区大小，ubuntu.img ≤ rootfs分区大小，rootfs分区修改方法可参考我司论坛识库描述：http://bbs.witech.com.cn/portal.php?mod=view&aid=410

扩容后将ubuntu.img文件挂载到target目录下

forlinx@ubuntu:~/OK3399-desktop-release/rootfs$ sudo mount ubuntu.img target/

forlinx@ubuntu:~/OK3399-desktop-release/rootfs$ cd target

修改配置

forlinx@ubuntu:~/OK3399-desktop-release/rootfs/target$ sudo cp /usr/bin/qemu-arm-static usr/bin/

拷贝PC主机端的dns配置，因为待会安装程序时要用网络：

forlinx@ubuntu:~/OK3399-desktop-release/rootfs/target$ sudo cp -b /etc/resolv.conf  etc/resolv.conf

forlinx@ubuntu:~/OK3399-desktop-release/rootfs/target$ sudo vim etc/apt/source.list

添加

deb http://ports.ubuntu.com/ubuntu-ports/ xenial main universe

deb-src http://ports.ubuntu.com/ubuntu-ports/ xenial main universe

创建qemu挂载脚本

forlinx@ubuntu:~/OK3399-desktop-release/rootfs/target$ cd ..

forlinx@ubuntu:~/OK3399-desktop-release/rootfs$ touch mount.sh

forlinx@ubuntu:~/OK3399-desktop-release/rootfs$ vi mount.sh

添加以下内容：

#!/bin/bash

function mnt() {

    echo "MOUNTING"

    sudo mount -t proc /proc ${2}proc

    sudo mount -t sysfs /sys ${2}sys

    sudo mount -o bind /dev ${2}dev

    sudo chroot ${2}

}

function umnt() {

    echo "UNMOUNTING"

    sudo umount ${2}proc

    sudo umount ${2}sys

    sudo umount ${2}dev

}

if [ "$1" == "-m" ] && [ -n "$2" ] ;

then

    mnt $1 $2

elif [ "$1" == "-u" ] && [ -n "$2" ];

then

    umnt $1 $2

else

    echo ""

    echo "Either 1'st, 2'nd or both parameters were missing"

    echo ""

    echo "1'st parameter can be one of these: -m(mount) OR -u(umount)"

    echo "2'nd parameter is the full path of rootfs directory(with trailing '/')"

    echo ""

    echo "For example: ch-mount -m /media/sdcard/"

    echo ""

    echo 1st parameter : ${1}

    echo 2nd parameter : ${2}

fi

保存退出

forlinx@ubuntu:~/OK3399-desktop-release/rootfs$ chmod +x mount.sh

forlinx@ubuntu:~/OK3399-desktop-release/rootfs$ sudo ./mount.sh -m target/

到此，成功将ubuntu.img挂载到qemu上，虚拟机操作用户应该变为root@ubuntu:/# ，此时执行apt等操作会保留在ubuntu.img文件中

做对应的修改即可

退出 exit

取消挂载

forlinx@ubuntu:~/OK3399-desktop-release/rootfs$ sudo ./mount.sh -u target/

forlinx@ubuntu:~/OK3399-desktop-release/rootfs$ sudo umount target/

然后运行编译脚本生成update.img即可。