(1) ARCH = arm
(2) CROSS_COMPILE = /usr/local/arm/arm-2009q3/bin//arm-none-linux-gnueabi-
Busybox Settings---> Build Options---> [*]Build BusyBox as a static binary(no shared libs) Busybox Library Tuning---> [*]vi-style line editing commands [*]Fancy shell prompts Linux Module Utilities---> [ ]Simplified modutils [*]insmod [*]rmmod [*]lsmod [*]modprobe [*]depmod Linux System Utilities--->[*]mdev [*]Support /etc/mdev.conf [*]Support subdirs/symlinks [*]Support regular expressions substitutions when renaming dev [*]Support command execution at device addition/removal [*]Support loading of firmwares错误：sync.c:(.text.sync_main+0x78): undefined reference to `syncfs’
collect2: ld returned 1 exit status
Makefile:718: recipe for target ‘busybox_unstripped’ failed
make: * [busybox_unstripped] Error 1
解决：find -name “sync.c” 得到./coreutils/sync.c 
setenv bootargs root=/dev/nfs nfsroot=192.168.0.109:/root/rootfs ip=192.168.0.20:192.168.0.109:192.168.0.1:255.255.255.0::eth0:off init=/linuxrc console=ttySAC2,115200 注意：/root/rootfs 这个目录不是乱设置的，是与nfs的设置要一致才可以 问题：VFS: Cannot open root device "nfs" or unknown-block(2,0) 1、kernel的nfs的配置没有弄 2、uboot的启动命令问题 3、nfs的路径/root/rootfs确保是安装nfs的路径7、
问题： 
问题：nfs: server 192.168.0.109 not responding, still trying
解决： 
文章来源: 使用busybox制作rootfs