最近工作涉及一些要搭建基于PowerPC架构的CPU(P2020)的编译环境，谨以此文总结记录一下ltib(Linux Target Image Builder)编译环境的搭建过程，基本上freescale官网也有，只是做一个总结。
本文主要介绍使用CentOS6.6系统搭建ltib环境，并通过ltib命令行简单编译内核和最小文件系统，最终生成一个image，可烧写到powerpc p2020板子上运行。
freescale官网：http://www.nxp.com/
准备工作：
1) freescale官网下载Linux BSP for P2020 RDB (REV 20101101) ISO -- P1020_P2020RDB_20101101_ltib.iso
2) CentOS官网下载CentOS6.6 ISO -- CentOS-6.6-x86_64-minimal.iso
步骤：
1.安装centos6系统
2.创建新用户myuser, 使用ltib脚本时不允许使用root用户
[root@centos6 ~]# useradd myuser
[root@centos6 ~]# passwd myuser
3.安装telnet-server, 用于远程登陆
[root@centos6 ~]# yum install telnet-server
[root@centos6 ~]# vim /etc/xinetd.d/telnet //设置disable=no
[root@centos6 ~]# service xinetd restart
[root@centos6 ~]# vim /etc/sysconfig/iptables // 添加对端口23开放
[root@centos6 ~]# service iptables restart
4.添加sudo for myuser,
[root@centos6 ~]# vim /etc/sudoers
myuser ALL=(ALL) ALL
myuser ALL=(ALL) NOPASSWD: /bin/rpm,/opt/freescale/ltib/usr/bin/rpm
5.安装ltib环境需要的依赖包
[root@centos6 ~]# yum install -y perl glibc glibc-headers glibc-devel binutils \
libstdc++ libstdc++-devel gcc gcc-c++ sudo zlib zlib-devel rpm \
rpm-build patch wget ncurses ncurses-devel m4 bison flex texinfo \
gettext autoconf libtool glib2-devel lzo-devel intltool libuuid-devel \
tcl perl-ExtUtils-MakeMaker ld-linux.so.2
| package | version | comment |
| perl | >= 5.6.1 | to run the ltib script |
| glibc | >= 2.2.x | to build/run host packages |
| glibc-headers | >= 2.2.x | to build/run host packages |
| glibc-devel | >= 2.2.x | to build/run host packages |
| binutils | >= 2.11.93 | to build host packages |
| libstdc++ | any? | to build rpm-fs host package |
| libstdc++-devel | any? | to build rpm-fs host package |
| gcc | >= 2.96 | to build host packages |
| gcc-c++ | >= 2.26 | to build rpm-fs host package |
| sudo | any | to run the 'rpm install' phase on each package |
| zlib | any | to build rpm-fs and mtd-utils host packages |
| zlib-devel | any | to build rpm-fs and mtd-utils host packages |
| rpm | any | to build initial rpm-fs host package |
| rpm-build | any | to build initial rpm-fs host package |
| patch | any | used by rpm |
| wget | any | to download packages/patches on demand |
| ncurses | >= 5.1 | to build lkc (config language) host package |
| ncurses-devel | >= 5.1 | to build lkc (config language) host package |
| m4 | any? | may be needed by bison |
| bison | any | to build lkc (config language) host package |
| flex | any | Not required we install:for host lkc |
| texinfo | any | to build genext2fs host package (requires ncurses-deve |
| gettext | any | genext2fs target package |
| autoconf | >= 2.54 | Not required we install: automake target package |
| libtool | >= 1.4.2 | Not required we install: libusb target package |
| glib2-devel | any? | Needed if you want to build glib2 |
6.使用root用户挂载P1020_P2020RDB_20101101_ltib.iso, 并使用myuser用户安装BSP编译环境
[root@centos6 ~]# su root
[root@centos6 ~]# mount -o loop P1020_P2020RDB_20101101_ltib.iso /mnt
[root@centos6 ~]# su myuser
[myuser@centos6 ~]$ cd /opt/myuser/
[myuser@centos6 ~]$ /mnt/install
安装完成后，会在当前路径下生成一个以ltib前缀的路径，
进入到当前ltib路径，第一次需要执行：
[myuser@centos6 ltib]$ ./ltib
随后会生成以下路径，会安装交叉编译环境；
/opt/freescale/pkgs 存放编译的软件所有源码包