我用的是2.6.26版本linux，主机是Ubuntu 9.10 .
编译busybox 1.9.1版本
1、更改busybox1.9.1的Makefile
ARCH ?=arm
CROSS_COMPILE?= 自己的交叉编译环境的位置我的是：
2、make menuconfig
Busybox Setting----->
build option-->
[ ] Build BusyBox as a static binary (no shared libs)
[*] Build shared libbusybox
[*] Produce a binary for each applet, linked against libbusybox
[*] Produce additional busybox binary linked against libbusybox
[ ] Build with Large File Support (for accessing files > 2 GB)
installation option-->
[*] Don't use /usr
Applets links (as soft-links) --->
(./_install) BusyBox installation prefix
Busybox Library Tuning --->
MD5: Trade Bytes for Speed
[*] Faster /proc scanning code (+100 bytes)
[*] Support for /etc/networks
[*] Support for /etc/networks
[*] Additional editing keys
[*] vi-style line editing commands
[*] History saving
[*] Tab completion
[*] Username completion
[*] Fancy shell prompts
Linux Module Utilities --->
[*] Support version 2.6.x Linux kernels
[*] insmod
[*] Enable load map (-m) option
[*] Symbols in load map
[*] rmmod
[*] lsmod
[*] lsmod pretty output for 2.6.x Linux kernels
[*] modprobe
[ ] Multiple options parsing
[ ] Fancy alias parsing
--- Options common to multiple modutils
[ ] Support tainted module checking with new kernels
[ ] Support version 2.2.x to 2.4.x Linux kernels
[*] Support version 2.6.x Linux kernels
其他的用默认值
3、make install 开始安装
在busybox的根目录下生成_install文件夹，里面的东西有3项：bin sbin linuxrc
4、修改安装Busybox后的busybox文件属性，具体原因，随后再续。
chmod 4755 ./_install/bin/busybox
5、在自己的home目录中，建立rootfs目录
将_install的内容拷贝到rootfs目录中
6、在rootfs目录下，建立空目录：
dev home proc tmp var
boot etc lib mnt root sys usr
7、此时 rootfs目录下有如下内容：
bin dev home linuxrc proc sbin tmp var
boot etc lib mnt root sys usr
8、
以root身份建立节点文件/dev/console, /dev/null
mknod -m 600 dev/console c 5 1
mknod -m 666 dev/null c 1 3
9、进入etc目录，建立profile文件，内容如下：
#!/bin/sh
#/etc/profile:system-wide .profile file for the Bourne shells
echo
echo -n "Processing /etc/profile......"
# Set search library path
export LD_LIBRARY_PATH=/lib:/usr/lib
# set user path
export PATH=/bin:/sbin:/usr/bin:/usr/sbin
#Set PS1
USER = "`id -un`"
LOGNAME=$USER
PS1='[...@\h\w]\$'
PATH=$PATH
echo "Done!"
10、
在etc目录下建立init.d目录，然后在init.d目录下建立rcS文件
init.d/rcS内容：
#!/bin/sh
# set hostname, needed host file in /etc directory
#./etc/host
hostname `cat /etc/host`
# mount all filesystem defined in "fstab"
echo "#mount all......."
/bin/mount -a
#+/bin/chmod 0666 /dev/null
echo "# starting mdev...."
/bin/echo /sbin/mdev > /proc/sys/kernel/hotplug
mdev -s
/usr/etc/init
echo "******************************************"
echo " "
echo " "
echo " "
echo "******************************************"
11、在etc目录下建立fstab文件
proc /proc proc defaults 0 0
none /tmp ramfs defaults 0 0
none /var ramfs defaults 0 0
mdev /dev ramfs defaults 0 0
sysfs /sys sysfs defaults 0 0
12、在etc目录下建立inittab文件
::sysinit:/etc/init.d/rcS
::respawn:-/bin/sh
tty2::askfirst:-/bin/sh
::ctrlaltdel:/bin/umount -a -r
::shutdown:/bin umount -a -r
::shutdown:/sbin/swapoff -a
13、在etc目录下建立空文件
mdev.conf
14、
复制主机/etc/下面的文件passwd, group, shadow文件到/etc
[r...@centos etc]# cp /etc/group .
[r...@centos etc]# cp /etc/passwd .
[r...@centos etc]# cp /etc/shadow .
15、
因为是编译的时候使用的是动态链接。所以先看看~/busybox/_install/bin/busybox使用了哪些
lib，然后从glibc复制相应的lib到~/fsroot/lib中。
[r...@centos bin]# /usr/local/arm/3.4.1/arm-linux-gnu-readelf -d busybox
Dynamic section at offset 0xb8014 contains 22 entries:
Tag Type Name/Value
0x00000001 (NEEDED) Shared library:[libcrypt.so.1]
0x00000001 (NEEDED) Shared library: [libm.so.6]
0x00000001 (NEEDED) Shared library: [libc.so.6]
0x0000000c (INIT) 0xc04c
0x0000000d (FINI) 0xa26f0
0x00000004 (HASH) 0x80e8
0x00000005 (STRTAB) 0xa384
0x00000006 (SYMTAB) 0x8b24
……
……
……
复制lib 文件到lib目录下：
[r...@centos lib]cp /usr/local/arm/3.4.1/arm-linux/lib/ld* .
[r...@centos lib]cp /usr/local/arm/3.4.1/arm-linux/lib/libc-2.3.2.so .
[r...@centos lib]cp /usr/local/arm/3.4.1/arm-linux/lib/libc.so.6 .
[r...@centos lib]cp /usr/local/arm/3.4.1/arm-linux/lib/libm * .
[r...@centos lib]cp /usr/local/arm/3.4.1/arm-linux/lib/libcrypt* .
16、进入busybox根目录下，进入usr目录下，建立etc目录
在该etc目录下建立init文件
#!/bin/sh
ifconfig eth0 192.168.1.111 up
ifconfig lo 127.0.0.1
17、 mkcramfs fsroot fs_2.6.26_busybox.cramfs
18、利用之前编译好的zImage引导操作系统
回复邮件，或者到：
http://www.tek-life.org/2010/04/22/%e5%88%b6%e4%bd%9cinitrd/
中跟贴讨论，谢谢各位！
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