DIY min2440 Linux系统

          X86下的Linux-os已经装过好多次了,然二mini2440开发板上的系统还没有装过,于是自己将原板子的系统格式化后,在Nor Flash下启动mini2440,.  需要做的准备工作,有一个和pc机连接的USB线,Linux下一个usb传输工具(dnw)在文章的最后会提供代码.一切就绪后,完成以下几步:

(1)将Nand Flash format and partition.具体做法是:选择q,然后bon part 0 320k 2368k(将Nand分为0~320k,320k~2368k(2M),2368~128M.(可能会提示有bad分区,不必理会)

(2)安装bootloader.可以是u-boot,vivi,e-boot等.我们以厂家给提供的vivi往为例.选择v后,打开另一个终端,在光碟提供的images/linux下用dnw2 suppervivi-128M(这个是我板子的型号)发送.

(3)烧写kernel.同样的方法用dnw2 zImage_N35(也是根据板子不同).

(4)烧写yaffs文件系统.方法一样:dnw2 root_qtopia_128M.

              OK,记得要拔下USB线,重启系统来测试.

以下是dnw2的源代码:

/* dnw2 linux main file. This depends on libusb.
 *
 * Author:     Fox <[e-mail]>
 * License:    GPL
 *
 */



#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)
        {
            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;
}

编译: gcc dnw2.c -o dnw2  -lusb

为了方便将连接后的dnw2放在/usr/bin/下.