How to copy files from Hard disk to Compact flash

Via network through cifs (which is smb-extended)

mount -t cifs //server/share /mnt   .....

However, it is a long way to reach.

You need to enable cifs support in kernel.

You need mount.cifs. There is a port of samba in uClinux-dist. But the port did not generate mount.cifs automatically. You have to do some work on it.

I am not good at network. And can't not help you a lot on this.

But if you remember, I did suggest you to work on Linux and build tools/kernel/apps. Why? You will understand when you want to something that is not out the box.

As was suggested by Scott, using ftp server/client is a easier approach.

There is a ftpd in Microtronix's port. Setup the ftpd on nios2, and upload files to nios2 from XP.