freescale LTIB

最近开始研究M2277EVB Board,下面我们先来学习一下其开发环境的建立过程：

freescale公司为编译ColdFire Linux目标镜像提供了LITB工具包:

The LTIB (Linux Target Image Builder) project is a simple tool that can be used to develop and deploy BSPs (Board Support Packages) for various target platforms. Using this tool a user will be able to develop a GNU/Linux image for their target platform.

上面是官方解释。实际上，ltib是一系列脚本和管理方法的集合。开发者可以将源代码或开源软件包配置，编译，部署和压缩，成为可以烧写到flash上的bootloader，kernel和root file system映像。而这一切作都是通过./ltib命令加选项加参数实现的。

1） Installing the BSP

首先，将LITB的镜像文件M52277EVB_LTIB.iso复制到/home/wzg/目录下

$ su - root         // 切换身份到root用户，需要root用户密码

# mkdir /mnt/cdrom  //创建/mnt/cdrom目录

# mount -o loop /home/wzg/M52277EVB_LTIB.iso /mnt/cdrom  //挂载镜像文件

# su - wzg     //切换到普通用户（LTIB只允许在普通用户下安装）

$ cd /mnt/cdrom

$ ./install

2）Running LTIB

安装完成之后，会出现如下提示：

Installation complete, your ltib installation has been placed in
/home/wzg/ltib-m5227xevb-20080311, to complete the installation:

cd /home/wzg/ltib-m5227xevb-20080311
./ltib
按照如上提示，执行如下操作：

$ cd /home/wzg/ltib-m5227xevb-20080311   //切换到安装路径下
$ ./ltib

The first time LTIB runs on your machine a number of host packages are built and installed that
support LTIB. This may take a few minutes.

安装的时候 可能会出现如下提示：

I ran the command: sudo -S -l which returned:

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.
    #2) Think before you type.
    #3) With great power comes great responsibility.

Password:

This means you don't have sudo permission to execute rpm commands as root
without a password.  This is needed for this build script to operate correctly.

To configure this, as root using the command "/usr/sbin/visudo",
and add the following line in the User privilege section:

wzg ALL = NOPASSWD: /bin/rpm, /opt/freescale/ltib/usr/bin/rpm

Started: Mon May 24 16:32:21 2010
Ended:   Mon May 24 16:32:28 2010
Elapsed: 7 seconds

Build Failed

这是由于安装ltib需要是普通用户身份，但部分命令要超级用户权限才行，所以需要执行visudo增加用户liuby的权限，如下操作

# su
# /usr/sbin/visudo                // 此命令相对于vi打开了一个权限设置文件
                                // 按i进入输入模式，在最后一行添加如下一行内容
wzg   ALL = NOPASSWD: /bin/rpm, /opt/freescale/ltib/usr/bin/rpm
                               // 按ESC进入命令行模式，按:wq保存退出
# exit                         // 退出root，回到普通用户身份wzg

$ cd /home/wzg/ltib-m5227xevb-20080311   //切换到安装路径下
$ ./ltib

等待相当长的一定时间会出现：Build Succeeded
安装完成！