FL2440

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Linux系统在执行一条命令时，默认会到/bin、/sbin、/usr/bin、/usr/sbin这些路径下找，如果找不到则提示command not found，当然我们也可以

通过PATH环境变量告诉系统其它命令存放的路径。现在根文件系统树下这些路径里并没有Linux系统相关命令。

[shun@localhost ~]$ cd ~/fl2440/

[shun@localhost fl2440]$ ls

3rdparty bootloader crosstool driver images linux program

[shun@localhost fl2440]$ cd 3rdparty/

[shun@localhost 3rdparty]$wgethttps://busybox.net/downloads/busybox-1.27.1.tar.bz2

[shun@localhost 3rdparty]$tar -xjf busybox-1.27.1.tar.bz2

[shun@localhost 3rdparty]$cd busybox-1.27.1

[shun@localhost busybox-1.27.1]$ ls

applets coreutils loginutils README

applets_sh debianutils mailutils runit

arch docs Makefile scripts

archival e2fsprogs Makefile.custom selinux

AUTHORS editors Makefile.flags shell

busybox examples Makefile.help sysklogd

busybox.links findutils make_single_applets.sh testsuite

busybox_unstripped include miscutils TODO

busybox_unstripped.map init modutils TODO_unicode

busybox_unstripped.out INSTALL networking util-linux

Config.in libbb printutils

configs libpwdgrp procps

console-tools LICENSE qemu_multiarch_testing

[shun@localhost busybox-1.27.1]$make menuconfig #然后进行相应的设置

编译并安装busybox：

[shun@localhost busybox-1.27.1]$make && make install

切换到根文件系统树路径下，创建符号链接指向busybox程序：

[shun@localhost busybox-1.27.1]$ cd ../../linux/rootfs/

[shun@localhost rootfs]$ ls

apps bin data dev etc info lib linuxrc mnt proc root sbin sys tmp usr var

[shun@localhost rootfs]$ ln -s bin/b

base64 busybox

[shun@localhost rootfs]$ ln -s bin/busybox init

[shun@localhost rootfs]$ ls

apps bin data dev etc info init lib linuxrc mnt proc root sbin sys tmp usr var

列出根文件系统目录树下的Linux命令，这些命令其实都是符号链接到busybox：

[shun@localhost busybox-1.27.1]$ ls ../../linux/rootfs/bin/

ash cttyhack fatattr iostat lzop nice rpm su

base64 date fdflush ipcalc mkdir pidof run-parts sync

busybox dd fgrep kbd_mode mknod ping scriptreplay tar

cat df fsync kill mktemp ping6 sed touch

chattr dmesg getopt link more pipe_progress setarch true

chgrp dnsdomainname grep linux32 mount printenv setpriv umount

chmod dumpkmap gunzip linux64 mountpoint ps setserial uname

chown echo gzip ln mpstat pwd sh usleep

conspy ed hostname login mt rev sleep vi

cp egrep hush ls mv rm stat watch

cpio false ionice lsattr netstat rmdir stty zcat

[shun@localhost busybox-1.27.1]$

创建/dev路径下的设备节点

Linux下所有的东西都是文件，其中设备也是当作文件来处理。/dev路径下存放所有的Linux的设备文件，我们需要使用root权限执行mknod命令在这

里创建系统启动必须的设备文件节点，其他的设备节点将有mdev动态创建。

[shun@localhost ~]$ cd fl2440/linux/rootfs/

[shun@localhost rootfs]$ ls

apps bin data dev etc info init lib linuxrc mnt proc root sbin sys tmp usr var

[shun@localhost rootfs]$ sudo mknod -m666 dev/null c 1 3

[shun@localhost rootfs]$ sudo mknod -m666 dev/console c 5 1

[shun@localhost rootfs]$ sudo mknod -m666 dev/ttyS0 c 4 64

[shun@localhost rootfs]$ ls -l dev/

total 0

crw-rw-rw-. 1 root root 5, 1 Nov 6 21:03 console

crw-rw-rw-. 1 root root 1, 3 Nov 6 21:03 null

crw-rw-rw-. 1 root root 4, 64 Nov 6 21:04 ttyS0

[shun@localhost rootfs]$

创建/var路径下的文件

[shun@localhost rootfs]$ ln -s /tmp var/log

[shun@localhost rootfs]$ ln -s /tmp var/run

[shun@localhost rootfs]$ ln -s /tmp var/tmp

[shun@localhost rootfs]$ ls -l var/

total 0

lrwxrwxrwx. 1 shun shun 4 Nov 6 21:08 lock -> /tmp

lrwxrwxrwx. 1 shun shun 4 Nov 6 21:08 log -> /tmp

lrwxrwxrwx. 1 shun shun 4 Nov 6 21:08 run -> /tmp

lrwxrwxrwx. 1 shun shun 4 Nov 6 21:09 tmp -> /tmp

[shun@localhost rootfs]$

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