///从「林」开始： imx51-linux-rt3070ap-dhcpd/

/
//environment：
//       compile system：Ubantu 10.04
//       target system：   imx51
//       resource:            RT3070_SoftAP_v2.4.0.rar
                                   ltib --- L2.6.35_10.11.01_ER_source.tar.gz  
//       cross compile：   arm-none-linux-gnueabi-    
//ps :                           My English is the primary level(most of YouDao) --   Welcome Guidance
//reference:               http://blog.csdn.net/king_sundi/article/details/6158475 
                                   http://blog.csdn.net/linfeng999/article/details/6410224                                       
//

/compile rt3070ap///
("-" remove row, "+" add row )
$ cd 2010_0203_RT3070_SoftAP_v2.4.0.1_DPA
$ vim MODULE/Makefile
   -PLATFORM = PC
   +PLATFORM = SMDK

ifeq ($(PLATFORM),SMDK)
    -LINUX_SRC = /home/bhushan/itcenter/may28/linux-2.6-samsung
    -CROSS_COMPILE = /usr/local/arm/4.2.2-eabi/usr/bin/arm-linux-
    +LINUX_SRC = /home/lin/Desktop/linux-2.6.35.3
    +CROSS_COMPILE = /opt/freescale/usr/local/gcc-4.4.4-glibc-2.11.1-multilib-1.0/arm-fsl-linux-gnueabi/bin/arm-none-linux-gnueabi-
     endif
$ vim NETIF/Makefile
$ vim UTIL/Makefile
  repair the same as MODULE/Makefile
 
// repair usb_buffer_free and usb_buffer_allow error
$ vim UTIL/os/linux/rt_usb_util.c
  repair following:
   #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
  void *rausb_buffer_alloc(struct usb_device *dev,
         size_t size,
         gfp_t mem_flags,
         dma_addr_t *dma)
  {
   - return usb_buffer_alloc(dev, size, mem_flags, dma);
   + return usb_alloc_coherent(dev, size, mem_flags, dma);
  }
  EXPORT_SYMBOL(rausb_buffer_alloc);  
  void rausb_buffer_free(struct usb_device *dev,
         size_t size,
         void *addr,
         dma_addr_t dma)
  {
   - usb_buffer_free(dev, size, addr, dma);
   + usb_free_coherent(dev, size, addr, dma);
  }
  EXPORT_SYMBOL(rausb_buffer_free);
  #endif // LINUX_VERSION_CODE //
  
//repair rt3070ap: module license 'RALINK' taints kernel.
$ vim NETIF/os/linux/usb_main_dev.c
     +MODULE_LICENSE("GPL");

$ vim MODULE/common/rtmp_init.c
  repair following:
  #ifdef RTMP_MAC_USB
  - MODULE_LICENSE("RALINK");
  + MODULE_LICENSE("GPL");
  #endif // RTMP_MAC_USB //
  
  + #ifndef RTMP_MAC_USB
  + MODULE_LICENSE("GPL");
  + #endif 
  
$ sudo make ARCH=arm KBUILD_NOPEDANTIC=1

//compile dhcpd
$ cd ltib/
$ ./ltib -c

Package list  --->
 [*] dhcp                                                     
   [*]   Include DHCP server                            
   [*]   Include DHCP client support

$ cp rootfs/usr/sbin/dhcpd   @target rootfs/usr/local/bin/dhcpd

//configuration dhcpd/

reference google (dhcpd 配置)
example：
ddns-update-style ad-hoc;

deny client-updates;

subnet 192.168.1.0 netmask 255.255.255.0 {

default-lease-time 21600;

max-lease-time 43200;

option routers 192.168.1.1;

option subnet-mask 255.255.255.0;

option broadcast-address  192.168.1.255;

option domain-name "http://my.oschina.net/wuying";

option domain-name-servers 192.169.1.10;

option netbios-name-servers     192.168.1.10;

option www-server               192.168.1.10;

range  192.168.1.20 192.168.1.25;
}

$ mkdir -p @target rootfs/var/state/dhcp/
$ touch @target rootfs/var/state/dhcp/dhcpd.leases
  
//powerboot/
// cp *.ko to filesystem
$ tar -jxvf rootfs.tar.bz2 /tftpboot/
$ sudo make -p /tftpboot/usr/local/module
$ sudo cp MODULE/os/linux/*.ko /tftpboot/usr/local/module
$ sudo cp NETIF/os/linux/*.ko /tftpboot/usr/local/module 
$ sudo cp UTIL/os/linux/*.ko /tftpboot/usr/local/module

// cp ap-set.dat to filesystem
$ sudo make -p /tftpboot/etc/Wireless/RT2870AP
$ sudo cp MODULE/RT2870AP.dat /tftpboot/etc/Wireless/RT2870AP/

// set ap argument
$ vim /tftpboot/etc/Wireless/RT2870AP/RT2870AP.dat

// set powerboot
$ vim /etc/rc.d/rcS
----Added to the last line of behind
+ #install rc3070ap
+ insmod /usr/local/module/rtutil3070ap.ko
+ insmod /usr/local/module/rt3070ap.ko
+ insmod /usr/local/module/rtnet3070ap.ko

+ #run rc3070ap
+ ifconfig ra0 192.168.1.19
+ /usr/local/bin/dhcpd