向u-boot添加USB下载功能时，U-BOOT编译出错

zhengzhibogd

/************************
*                 file1.c
*************************/
…………
extern int GetDataFromUSB (unsigned max_len, unsigned char **data_ptr, unsigned *received_len);
int GetDataFromUsbAndWriteNand(unsigned max_len, unsigned offset, unsigned MaxNandSize, const char *Name)
{
        int ret;
        unsigned char *RevPtr;
        unsigned RevLen;
        printf("Downloading %s from USB...\n", Name);
        ret = GetDataFromUSB(max_len, &RevPtr, &RevLen);
        printf("Downloading %s %s\n", Name, ret >= 0 ? "successed" : "failed");
        return ret;
}



/************************
*                 file2.c
*************************/
…………
int GetDataFromUSB (unsigned max_len, unsigned char **data_ptr, unsigned *received_len)
{
        /*******实现********/
}

编译u-boot时出错：undefined reference to `GetDataFromUSB'

哪位大侠能帮忙解答这个问题呢 先谢谢了

zhengzhibogd

自己先顶一下 麻烦大侠们帮帮忙哦