[Etherboot-developers] Porting report

[Yannis M. <gm...@te...>]

Hi all,

The "porting"  of the etherboot is proceeding smoothly, I have managed 
to overcome some problems. I have also studied the COFF file format and 
based on the aout_loader I am able to download the minimum needed 
sections, namely, the .text and .data.

One question that I have is the following (always refering to version 
5.0.8):
Inside the tftp function I had to add in two different places some small 
delays. namely:
Quoted from the main.c:
----------------------------

        udelay(10000);   <------------1st
664:    for (;;)
    {
        long timeout;
#ifdef    CONGESTED
        timeout = rfc2131_sleep_interval(block?TFTP_REXMT: TIMEOUT, retry);
#else
        timeout = rfc2131_sleep_interval(TIMEOUT, retry);
#endif
    udelay(2000);   <------------2st
        if (!await_reply(AWAIT_TFTP, iport, NULL, timeout))
        {
----------------------------

If I omit the udelays, from the tcpdump I can see that the processor 
sends a lot of tftp requests before it gets an aknowledge from the server.

Any ideas on this ?

Regards

Yannis

-- 
Research Associate
National Technical University of Athens
Electrical & Computers Engineering Department
Computer Science Division, Telecommunications Laboratory
Heroon Polytechneiou 9, Zographou Campus, 157 73, Athens, Greece

E-mail:gm...@te...
Tel.: (+30)-210- 772 3939
Fax: (+30)-210- 772 2534