注意此方法我在TQ2440开发板测试成功，其他开发板请在王路上查找相应的代码！！！
经历了多方周折，终于看到程序下载到了目标板上下面是具体步骤：
),首先要安装libusb-dev这个库。我是在Ubuntu 下做的。
那么就：sudo apt-get install libusb-dev
装完之后就编译一个下载工具，，网上有个牛人提供了一个。代码如下：
#include <stdio.h>#include <usb.h>#include <errno.h>#include <sys/stat.h>#include <fcntl.h>#include <unistd.h>
#define QQ2440_SECBULK_IDVENDOR 0x5345#define QQ2440_SECBULK_IDPRODUCT 0x1234
struct usb_dev_handle * open_port(){struct usb_bus *busses, *bus;
usb_init();usb_find_busses();usb_find_devices();
busses = usb_get_busses();for(bus=busses;bus;bus=bus->next){struct usb_device *dev;for(dev=bus->devices;dev;dev=dev->next){printf(“idVendor:0x%x/t,ipProduct:0x%x/n”,dev->descriptor.idVendor,dev->descriptor.idProduct);if( QQ2440_SECBULK_IDVENDOR==dev->descriptor.idVendor&& QQ2440_SECBULK_IDPRODUCT==dev->descriptor.idProduct){printf(“Target usb device found!/n”);struct usb_dev_handle *hdev = usb_open(dev);if(!hdev){perror(“Cannot open device”); }else{if(0!=usb_claim_interface(hdev, 0)){perror(“Cannot claim interface”);usb_close(hdev);hdev = NULL;}}return hdev;}}}
printf(“Target usb device not found!/n”);
return NULL;}
void usage(){printf(“Usage: dnw2 <file>/n/n”);}
unsigned char* prepare_write_buf(char *filename, unsigned int *len){unsigned char *write_buf = NULL;struct stat fs;
int fd = open(filename, O_RDONLY);if(-1==fd){perror(“Cannot open file”);return NULL;}if(-1==fstat(fd, &fs)){perror(“Cannot get file size”);goto error;}write_buf = (unsigned char*)malloc(fs.st_size+10);if(NULL==write_buf){perror(“malloc failed”);goto error;}
if(fs.st_size != read(fd, write_buf+8, fs.st_size)){perror(“Reading file failed”);goto error;}
printf(“Filename : %s/n”, filename);printf(“Filesize : %d bytes/n”, fs.st_size);
*((u_int32_t*)write_buf) = 0x30000000; //download address*((u_int32_t*)write_buf+1) = fs.st_size + 10; //download size;
*len = fs.st_size + 10;return write_buf;
error:if(fd!=-1) close(fd);if(NULL!=write_buf) free(write_buf);fs.st_size = 0;return NULL;
}
int main(int argc, char *argv[]){if(2!=argc){usage();return 1;}
struct usb_dev_handle *hdev = open_port();if(!hdev){return 1;}
unsigned int len = 0;unsigned char* write_buf = prepare_write_buf(argv[1], &len);if(NULL==write_buf) return 1;
unsigned int remain = len;unsigned int towrite;printf(“Writing data …/n”);while(remain){towrite = remain>512 ? 512 : remain;if(towrite != usb_bulk_write(hdev, 0x03, write_buf+(len-remain), towrite, 3000)){perror(“usb_bulk_write failed”);break;}remain-=towrite;printf(“/r%d%/t %d bytes “, (len-remain)*100/len, len-remain);fflush(stdout);}if(0==remain) printf(“Done!/n”);return 0;}
2),把它保存为文件如：dnw2.c接着编译: gcc dnw2.c -o dnw2 -lusb
3） 移动dnw2可执行文件到 /usr/bin下
sudo mv . / dnw2 / usr/ bin
4）
sudo dnw2 path/your_filename
觉得自己做的到和不做的到，其实只在一念之间
