手把手教你搭建powerpc(P2020)的ltib编译环境

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