在uboot-2009.06上移植nand，但报出
    -Map u-boot.map -o u-boot
drivers/mtd/nand/libnand.a(nand.o): In function `nand_init_chip':
/opt/uboot/u-boot-2009.06-mini2440/drivers/mtd/nand/nand.c:53: undefined reference to `board_nand_init'
make: *** [u-boot] 错误 1

请问大侠怎么回事？
我试过如果把CONFIG_CMD_NAND宏开关关闭的话，编译能通过，一打开就报错，请帮帮忙吧！

当CONFIG_CMD_NAND定义时，我们需要定义一个board_nand_init()函数用于初始化开发板特定的NAND Flash信息，其实现可以参考board目录下其他同类型CPU开发板。

可是我明明已经在drivers/mtd/nand/s3c2410_nand.c中已经定义了啊！
 int board_nand_init(struct nand_chip *nand)
{
   u_int32_t cfg;
    u_int8_t tacls, twrph0, twrph1;
    S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();

    DEBUGN("board_nand_init()\n");

    clk_power->CLKCON |= (1 << 4);
    
#if defined(CONFIG_S3C2440)
        DEBUGN("CONFIG_S3C2440\n");
        twrph0 = 4; twrph1 = 2; tacls = 0;
        cfg = (tacls<<12)|(twrph0<<8)|(twrph1<<4);
        NFCONF = cfg;
        //DEBUGN("cfg is %x\n",cfg);
        //DEBUGN("NFCONF is %lx\n",NFCONF);
        cfg = (1<<6)|(1<<4)|(0<<1)|(1<<0);
        NFCONT = cfg;
        //DEBUGN("cfg is %lx\n",cfg);
        //DEBUGN("NFCONT is %x\n",NFCONT);
/* initialize nand_chip data structure */
        nand->IO_ADDR_R = nand->IO_ADDR_W = (void *)0x4e000010;
        /* read_buf and write_buf are default */
        /* read_byte and write_byte are default */
        /* hwcontrol always must be implemented */
        nand->cmd_ctrl = s3c2410_hwcontrol;
        nand->dev_ready = s3c2410_dev_ready;
#endif
……
还是编译出错啊！

确保drivers/mtd/nand/s3c2410_nand.c编译进uboot

是编译的问题，解决了，谢谢！