On Thu, Jan 17, 2013 at 8:29 AM, David Aldrich David.Aldrich@emea.nec.comwrote:
I would like to give some more information about my problem. u-boot's tftp transfers do eventually complete and the evm boots. I can then execute tftp get commands from Linux on the evm and these execute quickly. So the problem definitely has to do with the way u-boot uses tftp.
I have experienced similar issues. It seems that once U-Boot's TFTP client has trouble with one packet that it tends to have a lot more trouble thereafter. For example, if the file I try to TFTP doesn't exist when I start the transfer, it retries until the file does exist at which time it starts the transfer (so far, so good), but the file transfer is then very slow. If I press CTRL-C to stop it then start it again, it runs quickly.
I have also had problems using TFTP from U-Boot through Ethernet hubs that seem to work well for everything else. Replacing the hubs with switches solved the problem in multiple cases.
I haven't tried to capture the packets and troubleshoot it, but it seems like there is something non-optimal in the timing.
Steve