[U-Boot] ping timeout

[Wolfgang Denk]

Dear "David Collier",

In message <memo.20091023095245.2092G at postmaster+dexdyne.com.cix.co.uk> you wrote:
> 
> Is there a better way to quickly check for the presence of a server?

Yes.

> Actually trying TFTP seems to take even longer.

No, if you configure it correctly.

> Would it be a good enhancement to u-boot to have an environment variable
> which changes the ping timeout when it exists?

Ping is not really useful. It may tell you that some machine is up and
running, but it will not tell you if there is any TFTP service running
on it. If you want to test for TFTP, then test for TFTP and not for
something unrelated.

See envrionment variable "netretry" (README) and variables
TftpRRQTimeoutMSecs and TftpRRQTimeoutCountMax (net/tftp.c and
common/update.c) for tuning TFTP connection behaviour and timeouts.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
The use of COBOL cripples the mind; its teaching  should,  therefore,
be regarded as a criminal offense.                   - E. W. Dijkstra