配置busybox

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linuxrc -> busybox，linuxrc就是busybox程序，也就是内核启动的第一个程序
编译busybox：
1.Makefile里加入交叉编译器前缀：CROSS_COMPILE ?= arm-linux-
2.（可以参考韦东山开发手册）
3.make
4. 创建根文件系统目录：mkdir -p /work/nfs_root/first_fs
5.将编译好的busybox安装到指定的目录/work/nfs_root/first_fs，make CONFIG_PREFIX=/work/nfs_root/first_fs install

第2步的操作（可以参考韦东山开发手册）：

1.//添加busybox的自动补全功能：-> Busybox Settings                                                 |         -> Busybox Library Tuning[*]   Tab completion2.//连接/编译选项-> Busybox Settings                                                 |  |       -> Build Options [ ] Build BusyBox as a static binary (no shared libs) //这个选项表示是否编译成静态库，目前配置为不编译成静态库，原因不清楚3.//要使用可加载的模块，需要把下面的配置选上：-> Linux Module Utilities[*] insmod                                                           | |  | |[*]   Module version checking                                        | |  | |[*]   Add module symbols to kernel symbol table                      | |  | |[*]   In kernel memory optimization (uClinux only)                   | |  | |[*]   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                              4.//为了可以很方便的构造/dev/目录并且可以支持热插拔设备，需要支持mdev。另外，为了方便调试，要选中mount，umount命令，并让mount命令支持NFS（网络文件系统）-> Linux System Utilities      [*] mdev                                                             | |  | |[*]   Support /etc/mdev.conf                                         | |  | |[*]     Support command execution at device addition/removal       [*] mount                                                            | |  | |[*]   Support mounting NFS file systems      [*] umount                                                           | |  | |[*]   umount -a option         5.//除了其他默认配置外，增加ifconfig命令：-> Networking Utilities     [*] ifconfig                                                         | |  | |[*]   Enable status reporting output (+7k)                           | |  | |[*]   Enable slip-specific options "keepalive" and "outfill"         | |  | |[*]   Enable options "mem_start", "io_addr", and "irq"               | |  | |[*]   Enable option "hw" (ether only)                                | |  | |[*]   Set the broadcast automatically