Hi, I am using u-boot. i want to write my own protocol and add a few commands to u-boot for my custom board.

I want to send packets and recieve packets (UDP).

I followed the example as given in tftp.c and am able to send packets. using NetSendUDPPacket.

I did not understand the following:

1)

What do the following do ?.

NetSetTimeout (TIMEOUT * CFG_HZ, TftpTimeout); NetSetHandler (TftpHandler);

All i could make sense it after the timeout, TftpTimeout is called. Is it called under all circumstances or only based on specific circumstances. ( Say if i get a packet. i may not want it to be called). i could not understand beyound this.

What is the precision of the timeout value. are milliseconds allowed ?

Am i right ?.

Why do we require an handler. what does NetStartAgain ( ) do ?. Where does it start again ?. if i want to use it - what should i keep in mind. any variables need to be taken care of ?.

2) What does NetState variable in net.c do ?

I could manage to write a send routine. but recieve i am not able to understand the code. I just want to recieve packets and take some actions (just like a server).

are there any examples for doing this. suppose i dont get a packet say within 1 sec. i may want to do some other thing ?. is it possible in u-boot.

I am a dull idiot. I dont understand easily. Please be elaborate in your answers.

Thanks for Your time. i would appreciate any responses.

Thanks once again.

With Warm Regards, John.