A Linux tool for downloading kernel and rootfs to mini2440

The manufacturer of mini2440 provides a MS Windows tool DNW.exe for downloading kernel image and root file system into the board. It works great but I'd like to have a similar tool on my dev Linux box so that I don't have to switch back and forth. Fortunately core_rui wrote a small command line program doing exactly the job. (Even though I prefer a program with GUI, but this is good enough for now).

Its usage is simple:

dnw2 suppervivi-128M

dnw2 zImage_T35

dnw2 root_qtopia_128M

Here is the source code:

/* dnw2 linux main file. This depends on libusb.
*
* Author: Fox
* License: GPL
*
*/
#include <stdio.h>
#include <usb.h>
#include <errno.h>
#include <sys>
#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 nn");
}

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 : %sn", filename);
printf("Filesize : %d bytesn", 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;
}

To compile: gcc dnw2.c -o dnw2 -lusb

dnw2 can be placed in /usr/bin for ease of use.