[U-Boot] list files on tftp / large kernel-image

[Frank Wunderlich]

Your right, i don't want to send it as Patch. Only show how i got working. A small bug is there: after strings done and i press only return (normally recall previous command) i also get non-printable chars. Maybe it is because last 3 lines (adress calculation) which i left untouched.

The best way currently should be adding 0-byte after my downloaded content (to make puts stop),but it seems i do something wrong with mw-command because it resets my board. I load kernels at same address so 1 0byte at this position should not be a problem.